Psoas Major Muscle
Gluteus Maximus – Attachments, Actions & Innervation
Attachments of Gluteus Maximus: Origin & Insertion
Origin: (proximal attachments)
a.Surface of ilium posterior to posterior gluteal line and posterior inferior surface of sacrum and coccyx.
Insertion: (distal attachments)
a.Gluteal tuberosity of femur and iliotibial tract (or band).
Actions of Gluteus Maximus on the thigh (femur):
a. Extends thigh at the hip.
b. Laterally Rotates thigh at the hip.
c. Abducts thigh at the hip.
(The inferior fibers also stabilize the extended knee by tightening iliotibial tract).
Nerve to Muscle and its Spinal Segment:
a. Inferior gluteal nerve (L5, S1, S2).