• Source: Obturator nerve

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




Structure


The obturator nerve originates from the anterior divisions of the L2, L3, and L4 spinal nerve roots. 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 vein, 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.
An accessory obturator nerve may be present in approximately 8% to 29% of the general population.




= Branches

=
Anterior branch of obturator nerve
Posterior branch of obturator nerve
Cutaneous branch of the obturator nerve




Function


The obturator nerve is responsible for the sensory innervation of the skin of the medial aspect of the thigh.
The nerve is also responsible for the motor innervation of the adductor muscles of the lower limb (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.




Clinical significance


An obturator nerve block may be used during knee surgery and urethral surgery in combination with other anaesthetics.




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References


This article incorporates text in the public domain from page 953 of the 20th edition of Gray's Anatomy (1918)




External links


Obturator nerve at the Duke University Health System's Orthopedics program
Anatomy photo:12:st-0602 at the SUNY Downstate Medical Center
Cross section image: pelvis/pelvis-female-17—Plastination Laboratory at the Medical University of Vienna
posteriorabdomen at The Anatomy Lesson by Wesley Norman (Georgetown University) (posteriorabdmus&nerves)
cutaneous field at neuroguide.com

Kata Kunci Pencarian:

• Obturator nerve
• Obturator foramen
• Adductor muscles of the hip
• Obturator internus muscle
• External obturator muscle
• Pectineus muscle
• Obturator
• Accessory obturator nerve
• Lumbar plexus
• Nerve compression syndrome