Obturator Externus

Written by Oliver Jones

Last updated October 26, 2022 • 3 Revisions •

The obturator externus is a muscle of the medial compartment of the thigh. It is one of the smaller muscles of the medial thigh and it is located superiorly within the compartment.

  • Attachments: Originates from the membrane of the obturator foramen and adjacent bone. It passes under the neck of femur and attaches onto the posterior aspect of the greater trochanter.
  • Actions: Adduction and lateral rotation of the thigh.
  • Innervation: Obturator nerve (L2-L4).
  • Blood Supply: Obturator artery and medial circumflex femoral artery.

Fig 1
Muscles of the medial thigh. The overlying muscles in the anterior compartment have been removed.

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