Obturator externus

A muscle located in the hip region that plays a vital role in the movement and stability of the thigh.

The obturator externus is a flat, triangular muscle situated on the outer surface of the pelvis. Originating from the external surface of the obturator membrane and the surrounding bony perimeter of the obturator foramen, it inserts into the trochanteric fossa of the femur. Its primary role is to facilitate hip movement and assist in stabilizing the femur during various activities.

Terminologia Anatomica

musculus obturatorius externus

System

Muscular system

Function

The obturator externus muscle is crucial for several movements related to the hip joint. Its primary function is to externally rotate the thigh, especially when the hip is flexed. This muscle helps maintain proper alignment of the femur during walking, running, and other forms of locomotion. Additionally, it plays a supportive role in stabilizing the hip joint, which is essential for maintaining balance and preventing injuries during dynamic activities. By working in conjunction with other hip muscles, the obturator externus contributes to the overall functionality of the lower limb, enhancing mobility and strength.

Location

The obturator externus is located deep within the pelvic region, adjacent to the hip joint. It is positioned beneath the gluteus maximus muscle and above the adductor muscles of the thigh. Specifically, it originates from the pelvic region, covering the outer part of the obturator foramen and the obturator membrane, and extends backward to insert at the trochanteric fossa on the femur. This strategic placement allows it to effectively influence hip movements while also being well-protected by surrounding structures, making it an integral part of the hip musculature.

Did You Know?

The obturator externus is often overlooked in discussions about hip muscles, yet it plays a crucial role in maintaining hip stability.
Injuries or dysfunction in this muscle can lead to hip joint pain or issues with lower limb movement.
The muscle is innervated by the obturator nerve, which also serves other adductor muscles of the thigh.