The gemellus inferior is an important muscle that connects the upper legs to the pelvic region. Two of these muscles are present in the human body, with one in each leg. This muscle enables the rotation of the thigh in a lateral, or outward, motion.
This muscle originates from the upper part of the ischial tuberosity, a bony protrusion on the lower back part of the hip bone. It runs laterally along the posterior part of the femur and is connected with the obturator internus muscular tendon. It goes into the central part of the trochanteric fossa.
The muscle, along with its surrounding muscles, is supplied with oxygen via the inferior gluteal artery. This artery belongs to a branch that is the primary source of blood supply to the hips and the posterior thigh region.
In addition to lateral motion of the hip, the function of the gemellus inferior is to aid in hip stability, extension, and abduction with the flexed thighs.