Anatomical variation
Differences in anatomical structures which are not regarded as a disease
Anatomical anomaly
Differences which are structural abnormalities or marked deviations from the average.
Sexual dimorphism
Differences between males and females.
-In pelvis:
Males have a subpubic angle<90, Ilia closer together, Sacrum tilted forward
Females have a subpubic angle> 90, Ilia further apart, sacrum tilted back
-In Skull:
Males have a large mastoid process, defined brow ridges
Females have a smaller mastoid process and a small brow ridge.