The undertakers' manual

by Auguste Renouard

THE RIGOR MORTIS.

It is proper to notice whether or not the body is in the condition of post mortem rigidity. More attention has, perhaps, been given to this post mortem condition than it well deserved. According to Kühne, the rigor mortis is produced by a change in the muscular fibres; the fibres first lose their contractibility, then there is coagulation of the myosine and loss of elasticity. When this acidity has reached its height, muscle becomes softer, and the rigor mortis gradually disappears; finally, the acid condition is succeeded by an alkaline fermentation, and decomposition ensues.

The rigor mortis generally begins in the muscles of the lower jaw and back of the neck; it then extends to those of the face, neck, thorax, arms, and finally, the legs; it usually disappears in the same order; it generally begins in from eight to twenty hours after death, but often much sooner. The bodies of persons killed on the field of battle, and of those who have been drowned, sometimes seem to be overtaken by the rigor mortis at the very instant of death; the bodies retain the same position, and the face the same expression, which they had in the last moments of life. The rigor mortis may continue for from one to ten days, generally, but not always; death from narcotic poisons is followed by a short and feeble rigidity. While death by lightning is followed by rapid and intense rigidity, in young children, it is feeble and of short duration. The degree and duration of rigor mortis after death from violence, from different diseases, etc., is stated so variedly and contradictorily by different observers, that no definite rules can be given concerning it.

The temperature of the normal living body is 98° to 99° F. In illness, the temperature may be increased several degrees. After death, the body generally cools to the same point as the surrounding air; this is said to take place in from fifteen to twenty hours.

Taylor, from the examination of one hundred bodies, states that the average heat of the skin of the abdomen, at a period of two to three hours after death, is 77°; at four to six hours, 74°; at six to eight hours, 70°; at twelve hours, 69°. The internal viscera retain their heat longer than the surface of the body.

It is said, that, after sudden death from accidents, apoplexy, acute disease and asphyxia, the body retains its heat for an unusually long period. It is both asserted and denied, that after death from hemorrhage the body cools rapidly; the body of an adult cools more slowly than that of a child or an old person; that of a fat person more slowly than that of a lean one.

In some cases there is an exceptional retention and even an increase of heat in the dead body. Dr. John Davy reports, that in case of death from rheumatism, after the viscera had been exposed for several minutes, the temperature of the left ventricle of the heart was 113°, and that of the liver 112°. In a second case, six hours after death, the temperature of the heart was 108°. It is stated that after death from yellow fever and cholera, the temperature increases for several hours after death. There are also recorded a number of instances in which the body retained its heat for several days, without known cause.

It will be seen from what has been said, that if we are called upon to pronounce upon the length of time that has elapsed since death, in a given case, this is only to be done approximately, and it is probably necessary to take into consideration the cause and manner of death, the condition of the individual, the state of the atmosphere, the manner in which the body has been kept after death; and even after making these allowances, we can only say that a person has probably been dead for such and such a time.

This chapter may prove tedious to some, but it is, however, an undeniable fact, that the preceding information (compiled from the Morbid Anatomy of F. Delafield, M. D.), is of the utmost importance to the professional undertaker. The external examination of the body, before handling, is a matter not to be neglected. Should any syphilitic sores or foul ulcers be present, the utmost caution must be used in handling the body, as the pus, which is a most virulent poison, might find its way into the system through some abrasion of the skin. The effects of this poison are such, that, should it not prove fatal, it will leave in the system traces that can never be completely eradicated. This chapter also contains information of such character as will be found needful to fully understand the subsequent chapters.