Medical Jurisprudence, Forensic medicine and Toxicology. Vol. 1

by R. A. Witthaus; Tracy C. Becker

The several varieties of wounds which we have been considering vary considerably in their nature, their effects, their danger, and in many other ways according to the region of the body in which they are situated. Some of these varieties are common in one situation and almost never occur in others. Although the nature of wounds found in the several regions of the body is not as important for a medical jurist as their danger and their influence in causing death, we will now consider the differences they exhibit on account of the region in which they occur.

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.