Human surface anatomy

The buttocks (: buttock) are two rounded portions of the exterior anatomy of humans, located on the posterior of the pelvic region. The buttocks are located between the lower back and the perineum. They are composed of a layer of exterior skin and underlying subcutaneous fat superimposed on a left and right gluteus maximus and gluteus medius muscles. The two gluteus maximus muscles are the largest muscles in the human body. They are responsible for movements such as straightening the body into the upright (standing) posture when it is bent at the waist; maintaining the body in the upright post

The perineum (: perineums or perinea) in placental mammals is the space between the anus and the genitals. The human perineum is between the anus and scrotum in the male or between the anus and vulva in the female. The perineum is the region of the body between the pubic symphysis (pubic arch) and the coccyx (tail bone), including the perineal body and surrounding structures. The perineal raphe is visible and pronounced to varying degrees.

area of heightened sensitivity of the body, touching which may elicit a sexual response

anatomical plane that divides the body into superior and inferior parts

large blood vessel in the arm

large blood vessel in the arm

place on the human body which it is usually customary to keep covered with clothing in public areas

study of the external features of the body of an animal

plane used to transect the human body, in order to describe the location of structures or the direction of movements

posterior part of the perineum

fold separating the thigh from the buttock