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.