Vastus Medialis Muscle
Piriformis – Attachments, Actions & Innervation
Attachments of Piriformis: Origin & Insertion
Origin: (proximal attachments)
a.Anterior surface of lateral sacrum.
Insertion: (distal attachments)
a.Greater trochanter of femur, along its upper medial surface.
Actions of Piriformis on the thigh (femur):
a. Laterally Rotates thigh at the hip.
b. Abducts thigh if hip is flexed.
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Nerve to Muscle and its Spinal Segment:
a. Branch of sacral plexus (S1, S2).