SN1 SHORT NOTE 5M ★ High-yield

Compare the ligature mark of hanging with that of strangulation.

Forensic Medicine · 2nd Professional — Para-Clinical

The Mark Compared

Feature	Hanging	Ligature strangulation
Direction	Oblique — running upward and backward toward the knot, following the line of the pull of the body weight	Transverse (horizontal), running round the neck at one level
Continuity	Non-continuous — there is a gap beneath the knot, where the ligature leaves the skin	Continuous, completely encircling the neck
Level	High — above the thyroid cartilage, between the larynx and the chin, since the ligature rides up	Low — at or below the thyroid cartilage
Depth	Unequal — deepest at the point opposite the knot, becoming shallower toward it	Uniform all the way round
Base of the mark	Pale, hard, dry and parchment-like from drying, often yellowish-brown; may show the weave of the ligature	Similar in character, but with more surrounding bruising and abrasion
Number of marks	Usually one, though a doubled ligature gives two	May be multiple and crossing, from repeated application
Associated abrasions	Few	Often abrasions and bruises above and below the mark, and nail marks from the victim clawing at the ligature
Subcutaneous tissue beneath	White, glistening and dry; ecchymosis uncommon	Ecchymosis and bruising common

CLINICAL PEARL

A ligature mark on its own proves nothing about whether the person was alive. The mark is a pressure abrasion, and it can be produced just as well on a body after death — which is exactly what happens when a murderer suspends a strangled victim. What distinguishes antemortem from postmortem is the vital reaction: bruising in the deeper tissues, congestion and petechiae above the mark, and histological inflammatory change at the margin.

Antemortem and Postmortem Marks, and Simulating Conditions

An antemortem mark shows a vital reaction — congestion and a reddish or bluish zone at the margins, ecchymosis in the deeper tissues and strap muscles, petechiae above the level of the ligature, and an inflammatory infiltrate on histology. Blood infiltrating the tissue does not wash away
A postmortem mark is pale and yellowish with no surrounding vital reaction, no deep bruising, and no petechiae; the tissue beneath is clean
Conditions simulating a ligature mark — a necklace, tight collar or a fold of a garment pressing on the neck; a natural skin fold in an obese person or an infant, in which putrefaction may produce a linear discolouration; excoriation from a chain; the pressure of a stethoscope or cervical collar applied during resuscitation; and drying artefact along a fold. None of these shows deep tissue bruising, and all should be excluded before reporting a ligature mark
The width of the mark reflects the width of the ligature, and a soft, broad ligature such as a dupatta, scarf, towel or bedsheet may leave NO mark AT all — particularly if removed promptly. The absence of a mark does not exclude ligature strangulation or hanging, and this qualification must accompany any negative report

Applied Aspects

Photograph the mark before the ligature is removed, and again after, with a scale; and describe its situation relative to the thyroid cartilage in centimetres
Look for two marks — a low transverse one beneath a high oblique one indicates strangulation followed by suspension to simulate suicide, and is the single most important finding to exclude
Take histology from the margin of the mark in every case where the question of antemortem or postmortem could arise; the gross appearance is often equivocal and the microscopy is not
Reflect the skin of the neck and examine the deep tissues; the ecchymosis beneath is what distinguishes a genuine antemortem mark from an artefact or a postmortem application
A soft ligature may leave no mark, so state that its absence does not exclude the mechanism; this is a standard point on which incomplete reports are attacked
Exclude the simulating conditions explicitly — a necklace, a collar, a skin fold in an obese neck — before reporting a ligature mark, since each has led to a wrongly suspected homicide
A soft broad ligature may leave no mark at all — a dupatta, scarf or bedsheet — particularly if removed promptly after death
Measure the mark from the thyroid cartilage and record whether it lies above or below it; the level is the single most discriminating feature
Nail marks above and below the mark are made by the victim clawing at the ligature, and are strong evidence of a conscious struggle

All questions in Asphyxial Deaths

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