Obturator nerve

Nerve: Obturator nerve
Structures surrounding right hip-joint. (Obturator nerve labeled at upper right.)
Nerves of the right lower extremity. Front view.
Latin	nervus obturatorius
Gray's	subject #212 953
Innervates	medial compartment of thigh
From	Lumbar plexus L2-L4
To	posterior branch of obturator nerve, anterior branch of obturator nerve

Not to be confused with Nerve to the obturator internus.

The obturator nerve in human anatomy arises from the ventral divisions of the second, third, and fourth lumbar nerves; the branch from the third is the largest, while that from the second is often very small.

Path

It descends through the fibers of the Psoas major, and emerges from its medial border near the brim of the pelvis; it then passes behind the common iliac arteries, and on the lateral side of the internal iliac artery and ureter, and runs along the lateral wall of the lesser pelvis, above and in front of the obturator vessels, to the upper part of the obturator foramen.

Here it enters the thigh, through the obturator canal, and divides into an anterior and a posterior branch, which are separated at first by some of the fibers of the Obturator externus, and lower down by the Adductor brevis.

Innervation

The Obturator nerve is responsible for the sensory innervation of the skin of the medial aspect of the thigh.

It is also responsible for the motor innervation of the adductor muscles of the lower extremity (external obturator., adductor longus, adductor brevis, adductor magnus, gracilis) and the pectineus (inconstant). It is, notably, not responsible for the innervation of the obturator internus, despite the similarity in name.

Branches

• Articular branch
• Anterior branch of obturator nerve
• Posterior branch of obturator nerve
• cutaneous branch of the obturator nerve

Additional images

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  Sacral plexus of the right side.

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  Right hip bone. Internal surface.

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  Left Levator ani from within.

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  The Obturator externus.

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  The arteries of the pelvis.

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  Variations in origin and course of obturator artery.

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  The relations of the femoral and abdominal inguinal rings, seen from within the abdomen. Right side.

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  Plan of lumbar plexus.

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  The lumbar plexus and its branches.

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  Deep and superficial dissection of the lumbar plexus.

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  Dissection of side wall of pelvis showing sacral and pudendal plexuses.

External links

• Duke Orthopedics obturator_nerve
• SUNY Labs 12:st-0602
• Cross section at UV pelvis/pelvis-female-17
• Anatomy at MUN nerve/lumbnerv
• Anatomy at MUN nerve/obtnerv
• posteriorabdomen at The Anatomy Lesson by Wesley Norman (Georgetown University) (posteriorabdmus&nerves)
• cutaneous field at neuroguide.com

References

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.