External Appearances Directly Due to Violence or Accident.—The MARKS on the neck. In some fatal cases there are either no marks at all or they are but slight; this is more likely to be the case in suicides than homicides, and is usually due to the ligature being soft and yielding. The victim of a homicide may, however, first be stunned and afterward strangled.
Marks are said to be plainer after the body has become cold and where subjects have recovered from attempts at suicide.
The marks of the ligature in strangulation usually encircle the neck more completely and more horizontally than in hanging. These conditions may, however, be reversed, because a body may be dragged by the neck after strangulation, and there have been suicides by hanging in whom the mark of the cord was horizontal. As a rule, however, a horizontal mark with the knot on the same level as the cord, especially if below the larynx, suggests strangulation rather than hanging; and if there are several marks the probability is even greater. In compression with the fingers the marks are not in a horizontal but oblique line.
The mark of the ligature is usually circular, well defined, and corresponds closely to the breadth of the ligature; rather depressed, and usually below the larynx. As a rule this depression is not deep; the skin at the bottom of the groove is usually very pale, while the adjacent parts are red or livid. Sometimes the bottom of the groove shows ecchymoses. Neyding[746] says that suggillations in the groove made by the ligature on the neck are rare, but are oftener found in strangulation than hanging, because the conditions favoring their formation are oftener found in strangulation. In most cases the skin and connective tissue of the groove and of the parts in the vicinity show, microscopically, hyperæmias and hemorrhages. Liman[747] states that when we find suggillation in the groove or its vicinity, we may know that some other form of violence has been applied at the same time as that of the ligature or hand. He had not seen suggillation in the furrow either in strangulation or in hanging, except when the injured persons had lived some time, and in cases of twisting of the umbilical cord. The absence of suggillation and ecchymosis was due, he thought, to the pressure on the capillaries. Bremme[748] says that in the subcutaneous connective tissue of the mark of the ligature there is no hemorrhage either in strangulation or hanging, if death occurs at once and the cord is removed at once after death; but if the cord remains for some time after death there may be hemorrhage, or if death does not occur at once whether the ligature is removed or not. It is impossible to distinguish ante-mortem from post-mortem hemorrhage.
The parchment skin seen in hanging is seldom seen in strangulation. Neyding[749] says that the dryness and induration called parchment skin depend mainly on the amount of excoriation of the skin, and this is greater in hanging. Tardieu explains this frequency as being due to the fact that the constriction in hanging lasts a longer time. Liman has seen the parchment skin in those strangled.
The violence used may cause ecchymoses and abrasions of the skin of the neck adjacent to the mark of the ligature.
The marks of very different constricting ligatures may be quite similar. Taylor[750] mentions a case in which a soft silk handkerchief was used, and the appearance was the same as that of a narrow cord, due to the tightness with which it was tied.
Where a hard substance like a piece of coal or stone is inserted into the ligature, usually then a soft cloth, and presses directly against some part of the neck, there is usually a corresponding bruise.
Marks of pressure by the thumb and fingers are usually on the front of the neck, and either just above or below the larynx. In many cases these marks are only those of the finger-tips with some scratches. These marks may show definitely the probable size of the assaulting hand, and whether right or left.
Marks of strangulation may disappear rapidly after the removal of the ligature. Assailants usually constrict the neck much more violently than is sufficient to cause death. Marks of violence on the neck are, therefore, greater in strangulation than in hanging.