Aeus is a synonym for buttocks.
The aeus is formed by the masses of the gluteal muscles or 'glutes' (the gluteus
maximus and the gluteus
by a layer of fat. The superior
aspect of the aeus ends at the iliac crest, and the lower
aspect is outlined by the horizontal gluteal crease. The gluteus
maximus has two insertion
points: 1/3 superior
portion of the linea aspera of the femur, and the superior
portion of the iliotibial tractus. The masses of the gluteus
maximus muscle are separated by an intermediate gluteal cleft or "crack" in which the anus is situated.
The aeus allow primates
to sit upright without needing to rest their
weight on their
feet as four-legged animals do.
Some baboons and all gibbons, though otherwise fur-covered, have
characteristic naked callosities on their
women and boys generally have
smooth so-called 'baby-bottoms', adult men have varying degrees
of hairgrowth, as on other parts of their