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What's Covered - Quick Map

HANGING — 20 Marks Answer (MD Forensic Medicine)

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DEFINITION

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CLASSIFICATION

A. By Degree of Suspension (Position of Feet)

• Partial standing (toes/feet on ground)
• Sitting position
• Kneeling position
• Reclining/prone position

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B. By Position of Noose/Knot

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C. By Mode / Manner

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MECHANISM OF DEATH

Critical Pressure Values (Parikh / Reddy):

Five Mechanisms:

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MODE, MANNER AND CAUSE OF DEATH

Mode of Death (Physiological process)

• Cerebral ischaemia (most common)
• Asphyxia
• Vagal inhibition / cardiac arrest
• Spinal cord injury (judicial)

Manner of Death (Circumstances)

• Suicidal (most common)
• Accidental
• Homicidal (very rare)

Cause of Death (To be certified at autopsy)

• "Asphyxia due to hanging"
• Or: "Cerebral ischaemia due to compression of carotid vessels by ligature (hanging)"
• Judicial: "Fracture-dislocation of cervical spine with spinal cord injury due to hanging"

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IPC vs BNS (Bharatiya Nyaya Sanhita 2023)

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POSTMORTEM APPEARANCES

External Appearances

1. Cyanosis of face, lips, fingernails (may be absent in rapid carotid compression)
2. Petechial haemorrhages (Tardieu spots) — conjunctiva, sclera, face (especially in partial hanging)
3. Congested, prominent eyeballs
4. Tongue — protrudes, dark brown/black (venous congestion + drying)
5. Bloody froth from nose/mouth (pulmonary oedema)

• Neck stretched; head tilted to side opposite the knot
• Face pale in complete hanging (carotid compressed before jugular); face congested in partial hanging (jugular compressed, vertebral artery supply continues)
• Salivary dribble from corner of mouth on the side opposite to the knot (ligature pressure on salivary glands)
• Postmortem lividity in glove-and-stocking distribution (forearms, hands, legs) due to dependent position
• Scrotal/penile congestion; possible seminal emission
• Middle ear haemorrhage (rupture of small vessels)

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The Ligature Mark

• 80% — above thyroid cartilage (between larynx and chin)
• 15% — at the level of thyroid cartilage
• 5% — below thyroid cartilage (partial hanging)

• Fresh: Pale, yellowish, parchment-like, dry, depressed furrow
• Later: Yellow-brown, firm, well-demarcated
• Rope: Deep, well-defined with mirror-image of weave pattern
• Soft material (dupatta, towel): Pale, poorly defined, no bruising

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Ligature Mark: Hanging vs Strangulation (Exam Table)

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AUTOPSY DISSECTION TECHNIQUE — NECK

Pre-dissection:

1. Do NOT remove the noose before scene documentation and photography
2. Document noose: nature, composition, width, type of knot, mode of application
3. To remove: cut opposite to the knot, preserve both cut ends with tape; do NOT untie the knot — it is evidence
4. Slip noose over the head or cut it; submit with body to mortuary

Order of Dissection (Critical):

Remove brain FIRST — then dissect neck (to drain cranial blood and prevent artefactual haemorrhage into neck structures from brain weight)

Layer-by-Layer Neck Dissection:

1. Skin and superficial fascia — examine groove, measure width, depth, colour, direction
2. Platysma — look for tears/haemorrhage
3. Sternomastoid and strap muscles — tears, haemorrhage
4. Carotid sheath and arteries — open fully up to mandible — look for intimal tears (horizontal, multiple, at different levels, near knot — traction type — DIAGNOSTIC of antemortem hanging)
5. Internal jugular veins — congestion
6. Vagus nerve — note any contusion
7. Larynx and trachea — petechiae, hyperaemia, compression
8. Hyoid bone — fracture at junction of inner 2/3 and outer 1/3 of greater cornu (rare below 40 yrs)
9. Thyroid cartilage — superior horns
10. Intervertebral discs (lumbar) — Simon's haemorrhages

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INTERNAL FINDINGS

Neck:

• Platysma / sternomastoid: Torn fibres (especially in judicial hanging)
• Carotid intimal tears: Horizontal traction tears with subintimal haemorrhage — diagnostic of antemortem hanging; multiple levels; seen especially with long drop
• Lymph nodes above and below ligature: Congested, haemorrhagic — vital reaction indicator
• Hyoid bone fracture: 0-20% average; junction of inner 2/3 and outer 1/3 of greater cornu; displaced outward; periosteum torn on inner side only; blood clot at fracture site if antemortem
• Thyroid cartilage: Posterior horn fractures from pressure on thyrohyoid ligament
• Deep muscles at base of tongue: Bruising (crushing against hard palate by ligature)
• Epiglottis / larynx / trachea: Petechiae, hyperaemia, congestion

Brain:

• Usually normal; or pale (carotid occlusion) or congested (jugular occlusion)
• Subarachnoid effusions common
• Cerebral oedema variable

Lungs:

• Congested, oedematous; bloody serum on section
• Subpleural ecchymoses (Tardieu spots)
• Pale if constriction at end of inspiration

Heart:

• Right side — distended with dark fluid blood
• Left side — relatively empty
• Subpericardial ecchymoses possible

Simon's Haemorrhages (High-yield viva):

Spinal Column (Judicial Hanging):

• Hangman's fracture — fracture-dislocation at C2-C3 or C3-C4
• Spinal cord stretched, torn, lacerated
• Pons and medulla may be contused

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ANTEMORTEM vs POSTMORTEM HANGING

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MEDICOLEGAL QUESTIONS

1. Was death due to hanging?

• Carotid intimal tears + subintimal haemorrhage
• Vital reaction in neck groove (histology)
• Congested/haemorrhagic lymph nodes above and below mark
• Hyperaemia of epiglottis/trachea
• Exclusion of other cause of death at autopsy

2. Was it Suicidal, Homicidal, or Accidental?

• No signs of struggle at scene or on body
• Accessible ligature and suspension point (person could have reached it)
• Knot within reach (lateral or anterior neck)
• Suicide note in ~25% of cases
• History of depression, mental illness (psychological autopsy)
• Face and hands free (may tie hands to prevent change of mind — does NOT exclude suicide)
• Farewell arrangements made by deceased

1. Signs of struggle — disturbed furniture, defensive wounds
2. Knot at back of neck (inaccessible to deceased)
3. Mouth gagged
4. Limbs tied (especially hands behind back)
5. Injuries inconsistent with self-infliction
6. Evidence of stupefaction by drugs/alcohol (toxicology)
7. Torn or disarranged clothing
8. Crescentic abrasions near ligature (throttling attempts)
9. Other injuries suggesting assault before suspension

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JUDICIAL HANGING

• Method of capital punishment — S.473(5) BNSS (formerly S.354(5) CrPC)
• Table of Drops used — drop length inversely proportional to body weight
• Knot at angle of jaw (sub-auricular position gives best results)
• Drop of 6-8 feet; momentum causes fracture-dislocation of C2-C3
• Hangman's fracture — bilateral pedicle fractures of C2
• Death instantaneous; heart continues 15-20 minutes; muscle jerks persist
• Extensive sternomastoid tears; transverse carotid intimal tears

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FATAL PERIOD

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HIGH-YIELD VIVA QUICK FACTS

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Sources: KS Narayan Reddy — Essentials of Forensic Medicine & Toxicology, 36th ed. 2026, pp. 334-342 | Parikh's Textbook of Medical Jurisprudence, pp. 202-210 | PC Dikshit Textbook of FMT, pp. 291-302 | DiMaio's Forensic Pathology 3rd ed. | Knight's Forensic Pathology

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DOCUMENTATION OF LIGATURE MATERIAL, POSTMORTEM REPORT OPINION & MODES OF DEATH IN HANGING

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PART 1 — DOCUMENTATION OF LIGATURE MATERIAL

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Step 1 — At the Scene (Before Touching the Body)

1. Type of material — rope, electrical cord, wire, dupatta, sari, belt, tie, trouser cord, dhoti, bedsheet, nylon cord, chain, etc.
2. Where it is attached — ceiling fan hook, roof beam, window grill, door handle, tree branch, etc. (note accessibility)
3. Position of the knot — lateral, posterior, anterior, or sub-auricular
4. Direction of suspension — whether rope goes vertically upward or obliquely
5. Height of suspension point from ground (measure)
6. Height of body from ground to feet (measure)
7. Photograph — full view and close-up of noose in situ, knot, and suspension point

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Step 2 — Removing the Ligature (Critical Technique)

Golden Rule: Never untie the knot. Never remove the noose by pulling over the head.

1. Support the body before cutting
2. Cut the ligature at the point diametrically opposite to the knot (so the knot remains fully intact)
3. Secure the two cut ends separately with adhesive tape or string — label them "cut end A" and "cut end B"
4. Slip the loop over the head OR cut and remove; preserve knot intact
5. Submit the entire ligature with the body to the mortuary as a sealed exhibit

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Step 3 — Detailed Description at Autopsy (What to Record)

• Any fibres, paint, or debris on the ligature (transfer evidence from beam/hook)
• Any fingerprints (refer to fingerprint expert)
• Any knot complexity — a complex or unusual knot inconsistent with the victim's skill level raises suspicion of homicide
• Whether there is a single noose or double/triple application

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Step 4 — Match Ligature to Ligature Mark

• Width of ligature vs width of groove — should approximately match
• Pattern of weave/texture vs impression on skin — mirror image in a rope groove
• If rope broke and body found on ground — match the free rope ends to confirm continuity
• Look for groove marks on the beam/hook matching the texture/width of the rope

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Step 5 — Preservation as Exhibit

1. Dry the ligature gently at room temperature (do NOT use heat)
2. Place in a brown paper bag (NOT plastic — plastic causes decomposition and artefact)
3. Seal, label, and sign with: case number, date, body identification, and autopsy surgeon's name
4. Hand over to the Investigating Officer under proper receipt/acknowledgment
5. Document in the column of "Articles Handed Over" in the postmortem report

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PART 2 — OPINION IN THE POSTMORTEM REPORT

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Structure of Opinion (Standard Format)

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The Three Opinions Required:

Opinion 1 — Cause of Death

Opinion 2 — Manner of Death

Opinion 3 — Time Since Death (Estimated)

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Articles to Be Mentioned in PM Report:

"The following articles are handed over to the Investigating Officer under receipt: 1. Ligature material (rope/dupatta/etc.) — sealed in paper envelope 2. Viscera — preserved in saturated saline for chemical analysis [if poisoning suspected/routine] 3. Blood sample — for alcohol/toxicology 4. Nail clippings, hair samples [if struggle suspected]"

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PART 3 — MODES OF DEATH IN HANGING (Detailed Explanation)

• Cause of death — the disease or injury that started the chain (e.g., hanging)
• Manner of death — the circumstances (suicide/homicide/accident)

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Mode 1 — Cerebral Ischaemia (Most Common Mode)

• The ligature compresses the carotid arteries (occluded by just 3.5 kg pressure)
• This occurs BEFORE the airways close (trachea needs 15 kg to compress)
• Reduced arterial blood reaching the brain → cerebral ischaemia → anoxic brain injury → unconsciousness → death
• Consciousness lost in 10-15 seconds; death in 3-5 minutes

• Brain may appear pale (bloodless)
• Relatively less asphyxial signs (face may be pale)
• Carotid intimal tears with subintimal haemorrhage
• Petechiae may be absent or sparse

• (a) Cases of persons with permanent tracheostomy below the noose who died by hanging — airway was completely patent throughout, yet death occurred
• (b) Vomitus found in bronchi BELOW the level of neck constriction — proves airway was open, breathing occurred below the noose even while dying

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Mode 2 — Cerebral Venous Congestion

• Jugular veins are occluded by just 2 kg (even less than carotid pressure)
• Venous outflow from brain blocked → venous blood accumulates in cranial cavity → raised intracranial pressure
• Simultaneously arterial inflow continues (vertebral arteries) → blood pools in the head → capillaries rupture → petechial haemorrhages (Tardieu spots)
• Progressive venous engorgement → cerebral oedema → brain herniation → death

• In partial hanging — the noose is applied with less force (only head weight); jugular veins are compressed first/more than carotids; vertebral artery supply continues
• In atypical hanging with soft, broad material that cannot compress the deeper carotids effectively

• Congested, cyanosed face
• Prominent petechiae — conjunctiva, face, sclera, skin of neck above ligature
• Congested, bulging eyeballs
• Protruding, congested tongue — dark, cyanotic
• Lungs — congested and oedematous
• Brain — engorged, venous

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Mode 3 — Asphyxia (Airway Obstruction)

• The noose forces the root of tongue upward and backward against the posterior pharyngeal wall
• The epiglottis folds over the laryngeal inlet, blocking the airway
• Alternatively, direct tracheal compression (requires 15 kg — rarely achieved in non-judicial hanging)
• Result: Air cannot enter the lungs → oxygen in blood falls → carbon dioxide rises → respiratory distress → convulsive stage → exhaustion → death

1. Dyspnoea (increased respiratory effort, cyanosis begins) — 0-60 sec
2. Convulsive stage (tonic-clonic seizures, loss of consciousness) — 1-2 min
3. Apnoea (respiratory failure) — 2-3 min
4. Terminal gasping (agonal breaths) — brief
5. Cardiac arrest — 4-5 minutes total

• Classical asphyxial triad — cyanosis + petechiae + congestion
• Lungs — pale if noose caught at end of inspiration; congested/oedematous if at end of expiration
• Subpleural/subpericardial Tardieu spots (ecchymoses from rupture of distended capillaries)
• Dark, fluid, unclotted blood in right heart
• Bladder may be emptied (relaxation of sphincters)
• Seminal emission (relaxation of reproductive sphincters)

• The trachea requires 15 kg pressure to compress
• In most hangings the body weight acts obliquely; the larynx is displaced but not mechanically crushed
• The carotid arteries and jugular veins are occluded long before the trachea is effectively compressed
• Hence pure airway obstruction as the sole mode is relatively rare

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Mode 4 — Vagal Inhibition (Reflex Cardiac Arrest)

• Pressure on the carotid sinus (at carotid bifurcation) or vagus nerve sheath by the noose
• Stimulation of baroreceptors in the carotid sinus → reflex vagal outflow → sudden cardiac arrest
• Alternatively: catecholamine surge (fear, struggling, apprehension) sensitizes the myocardium to vagal stimulation
• Alcohol intoxication, hypersensitive carotid sinus, emotion all predispose

• Instantaneous or very rapid death — faster than asphyxia
• Few or NO classical asphyxial signs — no petechiae, no cyanosis, no congestion (Knight's observation: ~50% of mechanical asphyxia deaths in his series showed NO classical signs)
• No significant hypoxia has time to develop
• Blood remains fluid, heart is found in near-normal state

• Explains cases where a person is found dead after a very short time of hanging with minimal external signs
• Explains deaths in children who get briefly caught in a cord
• Explains some karate-blow and mugging deaths (carotid sinus pressure without ligature)
• Explains why the absence of asphyxial signs does NOT exclude death by hanging

• Minimal or absent petechiae
• Face may be pale or normally coloured
• Ligature mark present (important)
• Cause of death is established by exclusion (ligature mark + position + no other cause)

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Mode 5 — Spinal Cord Injury / Brainstem Injury

• Drop of 5-8 metres creates significant momentum
• Sudden stop at the end of the drop → violent extension and lateral flexion of the neck
• Fracture-dislocation at C2-C3 or C3-C4 ("Hangman's fracture" — bilateral fracture of pedicles/neural arch of C2)
• Spinal cord is stretched, lacerated, or transected
• Brainstem (pons, medulla) may be directly contused
• Instantaneous unconsciousness and death

• Heart may continue to beat for 15-20 minutes (cardiac centre in medulla preserved transiently or via residual activity)
• Limb twitching and muscle jerks occur after death (spinal reflex activity below the lesion)
• Massive tearing of neck muscles and vessels
• Neck may be elongated dramatically; occasionally near-decapitation if drop is excessive
• No asphyxial signs (death is instantaneous)

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Summary Comparison Table — Modes of Death in Hanging

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Delayed Causes of Death After Rescue from Hanging (Reddy 2026):

1. Aspiration pneumonia (vomitus/blood aspirated)
2. Pulmonary oedema (neurogenic or hypoxic)
3. Laryngeal oedema (post-compression swelling — may cause delayed airway obstruction)
4. Hypoxic encephalopathy (brain damaged from period of ischaemia)
5. Cerebral infarction (from carotid dissection)
6. Cerebral abscess / softening
7. Retropharyngeal abscess, cervical cellulitis
8. Epileptiform convulsions, amnesia, dementia (sequelae)

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Le Faci's Sympathicae (Bonus Viva Point)

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Sources: KS Narayan Reddy 36th ed. 2026, pp. 334-342 | Parikh's Textbook of Medical Jurisprudence, pp. 202-210 | PC Dikshit Textbook of FMT, pp. 291-302 | DiMaio's Forensic Pathology 3rd ed.