WOUNDS OF THE HEAD.
These are often characterized by their apparent harmlessness and their real gravity sooner or later. We might almost make the opposite statement and say that those apparently grave are often virtually harmless, though this would be true only in a limited sense and in certain cases.
As to their nature, we find punctured wounds extremely rarely, incised and lacerated wounds often, while contusions and contused wounds are still more common. Incised and lacerated wounds of the head involve the scalp almost exclusively. These wounds heal remarkably well, even when the attachment is merely by a narrow pedicle, owing to the abundant blood-supply. Hemorrhage from the incised wounds is often free, for the vessels cannot retract, but it is seldom dangerous unless the wounds are very extensive. The only way in which they differ materially from similar wounds elsewhere is in the greater frequency of complicating erysipelas here than elsewhere. This is probably owing to the presence of septic conditions, as the head is generally dirtier than other parts of the body, and slight wounds especially are neglected. If the scalp is shaved over a wide margin and cleaned like other parts of the body, erysipelas is found little or no oftener than with similar wounds elsewhere. The density of the scalp is so great that the redness and swelling accompanying inflammations is comparatively slight. If erysipelas follows slight wounds of the head, there is some reason to suspect constitutional predisposition or careless treatment. From infection of such wounds of the scalp abscess or diffuse cellulitis of the scalp may develop as well as erysipelas. The constitutional symptoms in such a case may be marked or even severe, but the prognosis is favorable. In very rare cases necrosis of the skull may result or the inflammation may even extend to the brain. These incised and lacerated wounds of the scalp are usually accidental or inflicted by another; they are rarely self-inflicted. Contusions and contused wounds are the most common forms of injury to the head. These two kinds of injuries are almost invariably inflicted by another or are accidental. We have already seen that contused wounds of the scalp or over the eyebrow may closely resemble incised wounds in these localities. This fact should be borne in mind, as careful examination can usually distinguish them if they are fresh and until they begin to granulate. These wounds are liable to the same complications as incised wounds, in fact more liable, as the contusion makes the wound more susceptible to inflammation and the edges are more apt to be infected at the time of the injury.
One of the results of contusions of the head is the extravasation of blood, most often between the aponeurosis of the occipito-frontalis muscle and the pericranium. These extravasations are usually in the form of a hematoma. Such hematomata often present a hard circular or oval rim with a softer centre, and may readily be mistaken for fracture of the skull with depression. The diagnosis between hematoma and depressed fracture is not usually difficult, however, for with hematoma the ridge is elevated above the level of the skull and is movable on the surface of the skull; also the wounded edges often pit on pressure. With depressed fracture, on the other hand, the edge is at or about the level of the rest of the skull; it is sharper, more irregular, and less evenly circular. Contusions and the resulting hematoma may occasionally end by suppurating, but this event is rare. Contusions and contused wounds may occasionally show the marks of a weapon, indicating that they were inflicted by another. Also the position of the injury will indicate its origin, whether it is accidental or inflicted by another, for the former would not naturally occur on the vertex unless the fall was from a considerable height.
Another result of injuries to the head, especially of contusions and contused wounds, is FRACTURE OF THE SKULL. This may be simple or compound, depressed or not, etc. Fractures are serious inasmuch as they imply a degree of violence which may do damage to the brain. The fracture itself, especially if properly treated, affords a good prognosis, irrespective of any brain lesion. One variety of fracture of the skull offers an exception to this favorable prognosis, and that is fractures of the base of the skull. These may be fatal directly from injury of the vital centres at the base of the brain or soon fatal from hemorrhage in these parts. Or the fatal result may be secondary to an inflammation or meningitis which good treatment is often unable to prevent. It should not be considered that these fractures are uniformly fatal, for quite a considerable proportion recover. Fracture of the base usually occurs as the result of a fall. The injured person may land on the feet or buttocks, and yet receive a fracture of the base of the skull, the force of the fall being transmitted through the spine to the base of the skull. Fracture of the base of the skull usually occurs from an injury to the vault, not by contre coup, but by extension of a fissure found higher up in the skull. This extension takes place in the same meridian line of the skull with that of the force which produced the fracture, and in this way the base of the skull is fractured in different parts according to the point and direction of the application of the force. Thus in case the force compresses the skull antero-posteriorly the fracture will pass antero-posteriorly toward the base from the front or the back, whichever received the blow (see Fig. 13). Fractures of the vault of the skull occasionally occur opposite to the point struck; this may occur by contre coup, but not always so, as not infrequently in such rare cases a close examination may reveal an extension of a fissure from the point injured to the opposite pole of the skull. The shape and rarely the size of a fracture of the skull, especially if punctured in character, may show the shape and more rarely the size of the instrument or object which produced it. Apart from fracture of the base, the prognosis in fracture of the skull is serious, mainly on account of the danger of inflammation, which is greater in compound fractures, and also on account of the more remote danger of irritation from depressed fragments causing epilepsy, insanity, etc., at a later period.
Fig. 13.—Several Fractures of the Left Half of the Base of the Skull, Running Parallel to One Another and Approaching One Another, also Separation of the Mastoid Suture. The injury was caused by a fall on the left side of the back of the head.
A circumstance that Taylor[660] says is connected with fracture of the skull with depression—namely, that the person, sensible as long as the object producing the fracture remained wedged in, became insensible and began to manifest other fatal symptoms as soon as it was removed—must be extremely exceptional. It may be explained, if it occurs, by the occurrence of hemorrhage after the object which occluded an open vessel by its presence or its pressure was removed. For it should be remembered that the symptoms of compression in a depressed fracture of the skull are very rarely due to the compressing effect of the depressed bone, but rather to an injury of the brain, intracranial hemorrhage, or a local and temporary interference with the circulation.
Fig. 14.—“Terraced” Fracture of the Left Parietal Bone near the Sagittal Suture, caused by the Lower Part of the Rim of a Round-Headed Hammer. The blow was struck from the right side. ½ natural size.
We may truly say that wounds of the head are dangerous in proportion as they affect the brain. The existence of affection of the brain may be hard to tell from the appearances, for an injured person may recover from the first effects of a comparatively slight wound and yet die suddenly later.
Concussion is the name applied to one of the effects on the brain of a more or less violent blow directly on the head or transmitted indirectly to the head. Though the term “concussion” implies a functional rather than an organic lesion, yet in the majority of cases it is equivalent to laceration of the brain. With laceration of the brain there is usually more or less effusion of blood which may be limited to a very thin layer. Concussion may exist without laceration of the brain. Even death has been known to occur from concussion of the brain without any visible signs of injury to the brain, so that the concussion must have been functional and the fatal result due to shock of the nervous system. Fatal concussion does not, therefore, necessitate the existence of compression or visible injury of the brain. Concussion may sometimes be due to a violent fall upon the feet, in which case the shock is transmitted through the spinal column to the head with or without fracture of the base of the skull. It was in this way that the Duke of Orleans, the son of Louis Philippe, died.
Fig. 15.—Fractures of the Skull caused by a Four-sided Hammer. One caused by the Corner, the Other by the End of the Head of the Hammer. ¼ natural size.
Fig. 16.—Four-sided Fracture caused by a Hatchet-Shaped Instrument, the Edges Formed by Depression of the Broken Outer Table of the Skull.
—————————
The symptoms of concussion show all degrees of severity. Thus the injured person may become confused and giddy with or without falling, he may become pallid and nauseated and may vomit, but after a short period he recovers gradually.
Fig. 17.—Fracture of Parietal Bone with Depression, caused by the Blow of an Axe.
With a more severe injury, with which there is generally some laceration of the brain, the injured person falls and lies quiet and relaxed, apparently unconscious, though often he can be partly roused. Paralysis and anæsthesia are absent. The heart is feeble and fluttering, the skin cold and clammy. The pupils, as a rule, react to light, but otherwise vary considerably. Urine and fæces may be passed involuntarily. As he begins to regain consciousness, vomiting usually occurs. Consciousness usually returns within twenty-four or forty-eight hours, when headache and indisposition to exertion are complained of, and this may last for a long time. Occasionally the symptoms instead of abating increase, and coma supervenes, often indicating meningitis, encephalitis, or intracranial hemorrhage. In other cases the person may die almost immediately on the spot where he fell, while in still others apparent recovery takes place and death occurs later either suddenly or after a reappearance of symptoms. In such cases, abscess of the brain may occur and be the cause of the fatal result. These abscesses are the result of the injury, which may be almost anything from a compound fracture to a slight contusion not leaving any scar. The abscess may occur within a week[661] or not until after months or years. This interval of apparent recovery may lead to the false supposition that death was not due to the injury, but to some intervening cause. It is well to bear in mind that about half of the cases of abscess of the brain are not traumatic. A large majority of these are due to suppuration in the middle ear, a few to septic diseases or tuberculosis. The situation of the abscess often distinguishes between the traumatic and non-traumatic varieties. The traumatic variety is usually found beneath the injury or sometimes directly opposite, where the brain is injured by a kind of focussing of the radiated effects of the blow. The cases of abscess of the brain due to ear disease are usually found in the temporal lobe of the brain lying over the position of the ear or in the cerebellum behind it. The uncertainty of the nature and the extent of the cerebral injury in so-called contusion of the brain renders it necessary to be very careful in giving a prognosis. Any injury should be considered serious which has produced unconsciousness, for such an injury may produce enough laceration of the brain to render serious danger possible or even probable. We have seen that as a rule the symptoms of concussion come on immediately, but it is possible that symptoms at first so slight as to escape notice may become serious in a few hours or days. A gradual hemorrhage may sometimes account for this. The knowledge of certain acts performed or a conversation held at the last moment before the injury may be retained after recovery from concussion of the brain. This is not necessarily the case, for instead of remembering up to the moment of the injury, the injured person may remember only up to a certain time shortly before, or a part and not everything may be remembered.
Fig. 18.—Wounds of the Vault of the Cranium caused by Artillery Side-Arms, followed by Death shortly after.
The diagnosis of concussion of the brain from alcoholism is sometimes a matter of medico-legal interest or importance. Concussion may be so slight as to simulate intoxication. The history often clears the case up. The history of a blow or a fall or the presence of marks of violence on the head indicates concussion, though the blow or fall may not have caused the symptoms, which may be due to alcoholism. The odor of the breath may indicate alcoholism, but here too we may have both present and the concussion may be responsible for the symptoms. Or again the alcohol may have been given as a heart stimulant after the accident. This combination often occurs. If there is no odor in the breath, the presumption is in favor of concussion. As mistakes are still not infrequently made in diagnosis, those cases in which there is any ground for doubt should be carefully watched for developments. In general, the existence of concussion is more often overlooked than the coexisting alcoholism, so that if there is any doubt in a given case it should be treated as one of cerebral injury. The injury which causes the concussion in such cases is often due to the alcoholism. We may be able to verify this supposition if the injury is such as would be likely to be caused by a fall. There may be nothing found in the brain after death to distinguish between concussion and alcoholism. A bruise on the head only indicates a probability of concussion, for the bruise and alcoholism may both be present, the former perhaps due to the latter. The presence of alcohol in the stomach would indicate the existence of alcoholism.
Another effect of an injury which has caused concussion of the brain is an extravasation or effusion of blood. Extravasation of blood in or on the brain is one of the commonest causes of death from injury to the head. It may occur with or without marks of external injury. A person suffering from such an extravasation of blood may recover from the first effects of the injury, and at a varying time afterward the symptoms may return and increase so as to result fatally. In such a case the opening of the bleeding vessel may have become plugged until some exertion, emotion, or excitement on the part of the injured person has loosened the plug. A hemorrhage may have ceased from partial syncope and return with a stronger heart action due perhaps to the administration of alcohol. This effusion may occur on the surface of the brain in connection with a superficial laceration of the brain or just beneath or outside the dura mater and not involving the brain directly. The latter cases are almost always due to the effects of violence, though there is at least one case of apparently spontaneous rupture of the middle meningeal artery. The violence which causes a rupture of the branches of this artery may be so slight as to leave no bruise or so severe as to cause fracture of the skull. The most important symptom of such extradural hemorrhage is a period of consciousness after recovery from the first effects of the injury, then stupor may appear and deepen into coma. A subdural hemorrhage may cause almost the same symptoms, though the injury is usually such as has produced a depressed fracture. This hemorrhage is most often due to the rupture of a number of small vessels under the fracture, though if one larger vessel is ruptured it is most often the middle cerebral. A thin layer of hemorrhage in connection with a superficial laceration of the brain is of frequent occurrence with or without the other two forms of intracranial hemorrhage. If the brain is lacerated we may have convulsions in addition to other symptoms. Death occurring during or soon after a prize-fight may occur from some of the above classes of intracranial extravasations. It may be questioned whether the blows or a fall caused the hemorrhage. It is generally due to a fall in such cases, but may be due to blows, but the guilt is the same unless the fall was accidental. As the result of severe traumatism the vessels of the interior of the cerebrum may be ruptured or hemorrhage may occur into the ventricles of the brain. In such cases the symptoms will resemble those of ordinary apoplexy, only the cause is different from the latter and the injury is usually so severe as to leave no doubt as to the existence of a traumatism. The following question may arise in cases of intracranial hemorrhage and especially in the latter class of such cases, i.e., in cerebral hemorrhage:
Was the Extravasation of Blood due to Disease or Violence?—It may be alleged in defence that the hemorrhage was the natural result of disease. Where the hemorrhage is extradural or subdural or in connection with a superficial laceration of the brain, the cause is almost always traumatic. We have referred to one case of extradural hemorrhage from spontaneous rupture of the middle meningeal artery.[662] Subdural hemorrhage may occur from Pachymeningitis hæmorrhagica interna, but this condition is readily diagnosed on post-mortem examination and often with considerable certainty during life. A history of alcoholism, headache, impaired intellect, unsteady gait, occasional losses of consciousness, stupor increasing to coma, etc., indicates such a condition.
It is in cases of cerebral hemorrhage that there is the most difficulty in discriminating between that due to disease and that due to injury. It may be alleged that the hemorrhage was from diseased vessels, or that the effects of a blow, which cannot be denied, were aggravated by disease of the cerebral vessels or by excitement due to intoxication or passion. Cerebral hemorrhage from disease is rare before 40 years of age, except in alcoholics. When the hemorrhage is due to disease the blood-vessels are diseased. The most frequent site of such hemorrhages is the course of the lenticulo-striate artery in the ganglia of the base or the white substance of the centrum ovale.
When injury is the cause of the hemorrhage it is usually found beneath the point injured or directly opposite to this. External signs of the blow are generally visible if it be severe enough to cause a cerebral hemorrhage. The vessels may be perfectly healthy and the victim quite young if the hemorrhage is due to an injury, also the ruptured vessels may be plainly torn. The most difficult cases are those where there is the history of an injury and at the same time such a condition of disease of the cerebral vessels, etc., as would account for spontaneous hemorrhage. Where the injury was slight in the case of alcoholics or aged people the medical witness should be especially careful in stating that a cerebral hemorrhage was due to the injury. Then, too, in the act of falling from the occurrence of a cerebral hemorrhage due to disease the head may be injured and show marks of violence. It should be borne in mind that an injury to the head may be inflicted when disease of the brain, vessels, or membranes already exists. In such a case a slight blow might cause extensive hemorrhage, but as that which accelerates causes, death, even though it might sooner or later have occurred in the same manner without injury, is due to the injury inflicted.
From the above considerations we see that spontaneous cerebral hemorrhage and that due to disease are not always easily distinguished from that due to violence. In severe injuries the structure of the brain is plainly bruised, etc., but the greatest difficulty exists in cases of slight violence where arteritis of the cerebral blood-vessels coexists. The spontaneous extravasation of blood in or upon the brain from excitement does not usually occur except with diseased vessels, old age, or alcoholism. It is rare, therefore, in the young and healthy. If there is any doubt as to the origin of the hemorrhage, the medical witness should state the cause most probable in his judgment. Taylor[663] supposes the case of a man excited by passion, alcohol, or both, who becomes insensible and dies after being struck a blow so slight that it would not have affected a healthy person. If examination reveals a quantity of blood effused into the substance of the brain, there can be little doubt in the mind of the medical man that the excitement was the principal cause of the effusion. On the other hand, if a severe blow or a violent fall on the head had been received in a personal conflict with another and it is found that death was due to an effusion of blood upon the surface, there can be little doubt in the mind of the medical examiner that death was due to the blow, which would satisfactorily account for the conditions found without reference to coexisting excitement, etc. In fact, in all cases where a question is raised as to the cause of the hemorrhage, it is most important to consider whether the violence was not sufficient to account for the hemorrhage without the coexistence of disease or excitement. It is also most important to bear in mind that after severe injuries, as after a fall, causing extensive fracture of the skull, followed or not with extravasation of blood, the injured person may walk about and die some distance from the place of the accident and where no chance for a similar accident exists. In this way the suspicion of murder may be occasioned, as illustrated in the following case cited by Taylor:[664] A man was accused of the murder of his companion, who was found dead in a stable with fracture of the temporal bone which had caused rupture of the middle meningeal artery. The accused stated that the deceased had been injured by falling from his horse the day before. After the fall, however, the deceased had gone into a public-house, where he remained some time drinking before returning to the stable. The extravasation had here taken place gradually, as is characteristic of hemorrhage from the middle meningeal artery, and perhaps the excitement due to the drinking had influenced it.
The date of an effusion of blood may sometimes be a matter of importance in determining whether a given extravasation of blood in or on the brain was caused by a recent blow or had existed previously. The color and consistence of these effusions indicate whether they are old or recent; the precise date we cannot state, but the information we can give is often all that is required. The color of recent effusions is red, which changes after some days to a chocolate or brown, which generally turns to an ochre color (see Plate I.). This latter color may be met with from twelve to twenty-five days after the injury. The consistence of the coagula also becomes firmer with age, and as the coagula become firmer they are more or less laminated and the expressed lymph may lie between the laminæ or around the coagula.
MEDICAL JURISPRUDENCE—PLATE I.
Extravasations in several portions of the Arachnoid, with hemorrhages in neighboring portions of the brain. Death in four days.
Cerebral abscess. Epilepsy, Paresis. Death 3¼ years after the injury.
RECENT AND OLD CEREBRAL EFFUSIONS.
On account of the many layers of the brain coverings, a rough diagram of the coverings as given by Taylor[1] may be of much use to the medical expert in illustrating his evidence so as to make it clear to the court (see Fig. 19).
Wounds of the brain vary very widely in their immediate results according to the part of the brain injured. Thus sometimes a slight wound of the brain may be instantly fatal and often a severe wound in another part is not so. Extensive wounds may occur especially in the frontal lobes with remarkably slight disturbance. If a person with a wound of the brain survives the first effects of the injury the danger of inflammation remains. This danger may not be removed for a long time, for the inflammation may develop very slowly, not showing itself for from three to ten weeks or even later. Thus Taylor[665] cites the case of a child who was accidentally shot through the brain. The symptoms of inflammation did not appear until the twenty-sixth day and death occurred on the twenty-ninth day.
Fig. 19.—Diagramatic Representation of the Skull and Membranes of the Brain for Exhibition in Court. a, Skull with outer and inner tables and diploë; b, dura mater; c, arachnoid membrane; d, pia mater.
Wounds of the face heal remarkably well on account of its great vascularity. If severe they may leave great deformity or disfigurement, which may be the ground of a civil suit and thus require the testimony of a medical expert. If the wound involves the orbit or its contents it may be more serious, either from a fracture of the thin upper or inner wall of the orbit, separating it from the brain, or from extension of a secondary inflammation of the contents of the orbit to the brain. Wounds of the eyebrow may cause supra-orbital neuralgia or amaurosis from paralysis of the upper lid. Some fractures of the nose, especially those due to severe injury near the root of the nose, may be more serious than they appear. For in such cases, of which the writer has seen several, the fracture is not confined to the nose, but involves also the ethmoid bone and its cribriform plate forming part of the base of the skull. In such a case a fatal meningitis is a common result.
Fig. 20.—Double Fracture of the Thyroid and Cricoid Cartilages of the Larynx, from the Blow of a Flat-Iron.
Wounds of the neck are very rarely accidental, more often homicidal, but most often suicidal. In nature they are most often incised wounds. As we have already seen, the kind and condition of the weapon used is often indicated by the character of the wound. We have also seen that in many cases a suicidal wound of the neck can be distinguished from a homicidal one with more or less probability or even certainty. Wounds of the neck are often dangerous, and they may be rapidly fatal if they divide the main vessels, especially the carotid arteries. Wounds of the larynx, trachea, and œsophagus are grave and often fatal from entrance of blood into the air-passages or from subsequent œdema or inflammation occluding the air-passages. Wounds of the sympathetic and pneumogastric nerves may be fatal, and those of the recurrent laryngeal nerves cause aphonia. The situation of the average suicidal or homicidal cut-throat wound is in front, generally across the thyro-hyoid membrane, sometimes dividing the cricoid-thyroid membrane, and not at the side of the neck where the great vessels lie and would be more easily divided. The force is expended, as a rule, before the great vessels are reached. The epiglottis may be cut or detached and the incision may even reach the posterior wall of the pharynx, but the majority of the suicidal cases recover with proper treatment. The homicidal cases are more often fatal from division of the great vessels, though, as already stated, in either class of cases a fatal result may occur if the air-passages are opened from the entrance of blood into them and the consequent asphyxia.
Contusions of the neck may be so severe as to cause unconsciousness or even death. The latter may be due to a reflex inhibitory action, as in cases of death from a blow upon the pit of the stomach. As a result of such contusions we may have a fracture of the larynx usually confined to the thyroid and cricoid cartilages (see Fig. 20). This may be followed by hemorrhage from the larynx, some of which may pass down into the trachea and threaten death from asphyxia. Later emphysema often develops throughout the tissues of the neck, and there is great danger of œdema of the larynx. The prognosis is serious unless tracheotomy is performed early or the case is closely watched. It is most serious where the cricoid cartilage had been fractured, as this requires a greater degree of violence. Whereas incised wounds of the throat are most often suicidal, contusions are most often accidental or inflicted by another. Among the latter class of injuries may be included the so-called garroting, by which a person is seized violently around the throat, usually from behind, and generally with a view to strangle and rob. In such cases the larynx or trachea may be injured in the same way as by a contusing blow.