Anterior branch of obturator nerve

Anatomy

Diagram of the lumbar plexus with the anterior branch of the obturator nerve highlighted.

The anterior branch of the obturator nerve is a significant nerve in the human body, originating from the lumbar plexus. It is primarily responsible for innervating the adductor muscles of the thigh.

The obturator nerve arises from the anterior divisions of the second, third, and fourth lumbar nerves (L2-L4). It descends through the psoas major muscle and emerges from its medial border. The nerve then travels along the lateral wall of the pelvis and enters the thigh through the obturator canal.

Course

Upon entering the thigh, the obturator nerve divides into two branches: the anterior and posterior branches. The anterior branch descends between the adductor longus and adductor brevis muscles. It provides motor innervation to the adductor longus, adductor brevis, and the gracilis muscle. Additionally, it supplies a small cutaneous branch to the skin of the medial thigh.

Function

The primary function of the anterior branch of the obturator nerve is to facilitate the adduction of the thigh. This action is crucial for movements such as crossing the legs and stabilizing the pelvis during walking.

Clinical Significance

Injury to the anterior branch of the obturator nerve can result in weakness or paralysis of the adductor muscles, leading to difficulty in adducting the thigh. This can occur due to trauma, surgical complications, or compression by pelvic masses.

Related pages

• Obturator nerve
• Lumbar plexus
• Adductor muscles
• Thigh