Obturator Externus

Original Editor - Manisha Shrestha

Top Contributors - Manisha Shrestha and Kim Jackson

Description

Origin

The Obturator externus (OE) muscle originated from the external bony margin of the obturator foramen in clockwise direction from 12 o'clock around to the 10 o'clock position (right hip viewed from the front) and a few fibres arose from the obturator membrane.[1]

Insertion

It formed a musculo-tendinous junction at the level of femoral neck. The fibres passed laterally along the inferior margin of the acetabulum acting like a sling at the inferior part of the neck. The muscle inserted as a cylindrical tendon into the trochanteric fossa with some fibres extending towards the piriformis fossa. [1]

Nerve

the posterior branch of the obturator nerve

Artery

obturator and medial circumflex femoral artery.

Function

Primary function is to Externally rotate hip during hip flexion.

Acts as Hip stabiliser during hip flexion and internal rotation.

Clinical relevance

Assessment

Treatment

Resources

  1. 1.0 1.1 Gudena R, Alzahrani A, Railton P, Powell J, Ganz R. The anatomy and function of the obturator externus. Hip International. 2015 Sep;25(5):424-7.