Nuchal Crest
Definition
The raised area on the posterior occiput at the attachment of the nuchal muscles (trapezius, semispinalis capitis). Scored 1 (smooth, female) to 5 (pronounced, male). Reflects neck musculature load differential between sexes.
- Location
- Posterior occiput
- Associated muscles
- Trapezius and semispinalis capitis attachment
- Scoring scale
- 1, smooth, typically female, to 5, pronounced, typically male
- Basis
- Reflects sex-linked difference in neck musculature
Common questions
Why is nuchal crest development linked to sex rather than age alone?+
Neck muscle mass and the mechanical load placed on the occiput differ on average between males and females due to typical musculature differences, producing a more pronounced bony ridge in males even though the trait can also become more marked with age in either sex.
Is nuchal crest scoring used alone to estimate sex from a skull?+
No, it is one of several cranial morphological traits, alongside features like the mastoid process, supraorbital margin, and mental eminence, that are scored together because any single trait has meaningful overlap between the sexes.
Related terms
- Cranial Robusticity
- The overall size and prominence of bony surface features on the skull, reflecting body size and musculature. Males are on average more...
- FORDISC
- Forensic Discriminant Computer program, developed by Ousley and Jantz at the University of Tennessee Knoxville. Performs discriminant-function analysis on user-supplied craniometric measurements...
- Glabella
- The midline prominence on the frontal bone between the superciliary arches. Scored 1 (flat, female) to 5 (highly prominent, male). Correlated with...
- Gonial Angle
- The angle at the posterior inferior corner of the mandible (gonion) where the ramus meets the body. Males: more acute and everted;...
- Mastoid Process
- The conical projection inferior to the external auditory meatus on the temporal bone. Attachment for sternocleidomastoid and splenius capitis muscles. Scored 1...
- Mental Eminence
- The bony chin prominence of the mandible. Scored 1 (slight, triangular, female) to 5 (pronounced, squared, male). Used both in cranial scoring...
- Supra-Orbital Margin
- The bony rim forming the superior orbital border. Scored 1 (sharp and thin, female) to 5 (rounded and thick, male). Thickness reflects...
- Typicality Probability
- In FORDISC analysis, the probability that the unknown skull is a typical member of the best-matching reference group, based on Mahalanobis distance....
- Walker 2008 Five-Trait Scoring
- A standardised ordinal (1-5 scale) sex estimation system for five cranial traits: mastoid process, nuchal crest, supra-orbital margin, glabella, and mental eminence....