What muscles are attached to the pelvic girdle?

Answer 1

Gluteal muscles cover the lateral surfaces of the ilia . The gluteus maximus muscle is the largest and most posterior of the gluteal muscles. Its origin includes parts of the ilium; the sacrum, coccyx, and associated ligaments; and the lumbodorsal fascia. Acting alone, this massive muscle produces extension and lateral rotation at the hip joint. The gluteus maximus shares an insertion with the tensor fasciae latae muscle, which originates on the iliac crest and the anterior superior iliac spine. Together these muscles pull on the iliotibialtract, a band of collagen fibers that extends along the lateral surface of the thigh and inserts on the tibia. This tract provides a lateral brace for the knee that becomes particularly important when you balance on one foot. The gluteus mediusand gluteus minimus muscles originate anterior to the origin of the gluteus maximus muscle and insert on the greater trochanter of the femur. The anterior gluteal line on the lateral surface of the ilium marks the boundary between these muscles. The lateral rotators originate at or inferior to the horizontal axis of the acetabulum. There are six lateral rotator muscles in all, of which the piriformis muscle and the obturator muscles are dominant . The adductors originate inferior to the horizontal axis of the acetabulum. This muscle group includes the adductor magnus, adductor brevis, adductor longus, pectineus, and gracilis muscles. All but the adductor magnus originate both anterior and inferior to the joint, so they perform hip flexion as well as adduction. The adductor magnus muscle can produce either adduction and flexion or adduction and extension, depending on the region stimulated. The adductor magnus muscle may also produce medial or lateral rotation at the hip. The other muscles produce medial rotation. These muscles insert on low ridges along the posterior surface of the femur. When an athlete suffers a pulled groin, the problem is a strain--a muscle tear or break--in one of these adductor muscles. The medial surface of the pelvis is dominated by a pair of muscles. The large psoas major muscle originates alongside the inferior thoracic and lumbar vertebrae, and its insertion lies on the lesser trochanter of the femur. Before reaching this insertion, its tendon merges with that of the iliacus muscle, which nestles within the iliac fossa. These two muscles are powerful hip flexors and are often referred to collectively as the iliopsoas muscle. medical student: Dr.Fofo