Steatopygia

Steatopygia is the state of having substantial levels of fatty tissue on the buttocks and thighs. This can be seen on the buttocks, the inside and outside of the thighs, and the knee.

Steatopygia is an inherited condition of the Khoisan peoples of southern Africa. Charles Darwin wrote about the Khoisan in The Descent of Man in 1882, commenting that their steatopygia evolved through sexual selection in human evolution, and that "the posterior part of the body projects in a most wonderful manner".^[1]

Steotopygia appearance relies on the combination of the relationship between the femur and the android pelvis only with inclusion of various fat genes that give various proportions to Steotopygia. The phenotype is what african populations subraces like the pygymy , sanbushman , hadza etc.... kept from ancient humans. The austranisians like the andamanese where able to keep steotopygia due to the fact they didn't intermarry with eurasian peoples they where cut of from the rest of the asian continent after the last glacial maximum just before the dawn of farming. Ancient humans where hard to sexually differentiate from meaning both men and women would show the same morphological phenotypes. It's only when fat became a more sexual diformarism molecule about 150 000 years ago homo sapien males and females where more destuiguishable African male have a triangle shape figure same with african female but with the main difference being females who have gone through puberty showing a higher proportion to fat accumulation in the hips, butt and thighs hence steotopygia is more prevelent "visualy" in females who have gone through puberty . Steotopygia shows on both male and female mentioned above regardless of BMI that means even when severely underweight steotopygia still expresses itself usually resulting in a default triangle shape. The reason to this triangle shape is due to the fact the African male and female skeleton look more triangular in the front then a android looking at them from the back this was the same with ancient human . Steotopygia shelfing of the buttocks region is due to the posterior planar structure of the android pelvis that causes a table like or some might say "shelf like" appearance . This "shelfing of the gluteus region" becomes more pronounced universally when underweight and follows with what looks like a sinking depression but it is also common in people with a healthy BMI but mainly all relies on heredity genetics. Steotopygia is also expressive in children both genders male and female who have not went through puberty even in infants . References

   [1]
   C.-M. Oh, J.H. Park, H.S. Chung, J.M. Yu, W. Chung, J.G. Kang, et al.
   Effect of body shape on the development of cardiovascular disease in individuals with metabolically healthy obesity
   Medicine (Baltim) (2020), 10.1097/MD.0000000000022036

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