Name

# Obturator Internus

Pronunciation

(OB-tu-ra-tur in-TER-nus)

Origin/Proximal Attachment

Internal margins of obturator foramen; obturator membrane

Insertion/Distal Attachment

Medial aspect of greater trochanter (through lesser sciatic foramen)

Action/Relevance

Externally rotate the thighAbducts thigh when flexed

Innervation

Nerve to obturator internus (L5, S1, 2)

Notes

Both gemelli fuse with the tendon of ob internus before its insertion.