Buttock

The buttocks (often called butt in colloquial American speech and arse in British speech) are rounded portions of the anatomy located on the posterior of the pelvic region of the great apes, including humans. The buttocks are formed by the masses of the two gluteal muscles; the gluteus maximus and the gluteus medius,(a.k.a. 'the glutes'.) The superior aspect of the buttock 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. They allow primates to sit upright comfortably without needing to rest their weight on their feet, as (for example) cats and dogs must do when they sit upright.

Related Topics:
American - Arse - Pelvic - Great ape - Gluteus maximus - Gluteus medius - Iliac crest - Horizontal gluteal crease - Linea aspera - Femur - Iliotibial tractus - Gluteal cleft - Anus - Feet - Cat - Dog

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