Frenulum Tear
Definition
A tear in the frenulum labii (the midline fold connecting the upper lip to the gum), produced by forceful smothering pressure; present in approximately 30% of post-mortem smothering series (Saukko and Knight, 2015) and absent in SIDS.
- Location
- Frenulum labii, midline fold, upper lip to gum
- Cause
- Forceful smothering pressure
- Approx. prevalence
- About 30% of post-mortem smothering series
- SIDS comparison
- Absent in SIDS
Common questions
Why is a frenulum tear significant when distinguishing smothering from SIDS in an infant death?+
Because a torn frenulum requires mechanical pressure of the kind produced by an object or hand pressed forcefully over the mouth and nose, and it does not occur in sudden infant death syndrome, its presence is a physical indicator that supports asphyxial homicide over a natural or unexplained death.
Can the absence of a frenulum tear rule out smothering?+
No. It is present in only a minority of confirmed smothering cases, so a soft, pliable surface such as a pillow or bedding can occlude the airway without tearing the frenulum, meaning its absence carries little weight on its own.
Related terms
- Anatomy Act 1832
- UK statute prompted by the Burke and Hare murders that legalised use of unclaimed bodies for medical education, removing the economic incentive...
- Burking
- A combined method of homicide by simultaneous smothering (nose and mouth occlusion) and chest compression, preventing thoracic expansion. Named for William Burke...
- Crescentic Fingernail Abrasion
- A crescent-shaped skin abrasion produced by a fingernail during manual strangulation, with concave margin pointing toward the applied finger. Distinguishes manual throttling...
- Gag-and-Bind Asphyxia
- Asphyxia produced by oropharyngeal or nasal obstruction from a gag combined with physical restraint preventing airway clearance; encountered in robbery, kidnapping, and...
- Manual Strangulation (Throttling)
- Asphyxia produced by application of the assailant's hands to the neck, compressing carotid arteries, jugular veins, and trachea. Produces fingertip bruising and...
- SIDS (Sudden Infant Death Syndrome)
- A diagnosis of exclusion under the AAP definition: sudden unexpected death of an infant under one year, occurring apparently during sleep, unexplained...
- Smothering
- Asphyxia by occlusion of the external respiratory orifices (nose and mouth) without neck compression. May produce minimal or no external marks; internal...