The proximal end of the femur articulates with the hip. The rounded head of the femur fits within the acetabulum of the coxal bones, forming a ball-and-socket joint. The fovea capitis is a small depression in the head serves as an attachment point for ligaments. The greater trochanter sticks up from the shaft of the bone bone still sits slightly lower than the head, and is the insertion point of the gluteus medius muscle. The greater trochanter of females is larger than males.