Sexual Dimorphism
Definition
Systematic physical differences between biological males and females of a species. In teeth it is expressed mainly as size: males average larger crown dimensions across most tooth types and most populations, with the canines showing the largest and most consistent dimorphism.
- Strongest skeletal indicator
- Pelvis
- Secondary skeletal indicator
- Skull
- Most consistent dental dimorphism
- Canine teeth (crown size)
Common questions
What anatomical features show the clearest sex differences in skeletal remains?+
The pelvis shows the strongest sexual dimorphism in the human skeleton. The skull also displays notable differences between males and females, though less pronounced than the pelvis.
Can teeth be used to determine if skeletal remains are male or female?+
Yes. Males typically have larger crown dimensions across most tooth types and populations compared to females. Canines show the largest and most consistent size difference between the sexes.
Why is sexual dimorphism useful in forensic investigations?+
Sexual dimorphism provides anatomical markers that forensic practitioners use to estimate the biological sex of skeletal remains. Different skeletal features can be compared to build a profile when complete remains are not available.
Related terms
- Amelogenin
- A gene on both the X and Y chromosomes used for sex determination in forensic STR kits. The X-allele amplicon is approximately...
- Barr Body
- A condensed, transcriptionally inactive X chromosome visible in the interphase nuclei of XX individuals. In dental cells it appears as a small...
- Biological Profile
- The four-part osteological description of an unidentified individual: sex, age range, population affinity (ancestry), and estimated stature. The profile constrains the pool...
- Discriminant Function Analysis (DFA)
- A multivariate statistical method that builds a weighted linear equation from measurements to classify specimens into groups (here, male or female). A...
- Epiphyseal Fusion
- The obliteration of the cartilaginous growth plate and bony union of the epiphysis with the diaphysis. Fusion sequence and timing form the...
- Forensic Anthropology
- The laboratory and scene-side discipline concerned with the analysis of skeletal and decomposed remains to establish biological profile, manner of death, trauma,...
- Glabella
- The midline prominence on the frontal bone between the superciliary arches. Scored 1 (flat, female) to 5 (highly prominent, male). Correlated with...
- Gustafson Method
- Dental ageing method based on six progressive changes in a single tooth: attrition, periodontosis, secondary dentine, cementum apposition, root resorption and root...
- Haversian System (Osteon)
- Cylindrical structural unit of compact bone with a central Haversian canal, concentric lamellae and osteocytes in lacunae; pattern and canal density differ...
- Mandibular Canine Index (MCI)
- The ratio of mandibular canine mesiodistal crown width to intercanine distance, multiplied by 100. Values above a population-specific threshold lean male. Described...
- Mastoid Process
- The conical projection inferior to the external auditory meatus on the temporal bone. Attachment for sternocleidomastoid and splenius capitis muscles. Scored 1...
- Odontometrics
- The quantitative measurement of teeth, covering crown diameters, root lengths, and cusp dimensions. In forensic practice these measurements feed discriminant function analyses...
Explained in these topics
- Sex Estimation from Teeth and Dental DimensionsSystematic physical differences between biological males and females of a species. In teeth it is expressed mainly as size: males average larger crown dimensio...
- Skeletal Remains: Species, Sex, Age, Stature and IdentificationAnatomical difference between male and female of the same species; the pelvis carries the strongest dimorphism in the human skeleton, followed by the skull.