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Obturator Nerve

Obturator Nerve belongs to the adductor compartment of the thigh. The inside of psoas major from anterior sections of the ventral rami of L2 to L4 spinal nerves. The nerve goes down in psoas major and issues from its medial border at the ala of the sacrum. It runs through the upper anterior part of the obturator foramen to the medial (adductor) compartment of the thigh while descending along the lateral wall of the lesser pelvis on the obturator internus. It divides into anterior and posterior which stride the adductor brevis muscle, close to the obturator foramen. All muscles of the adductor compartment of thigh are supplied by its motor branches. Cutaneous area on the lower-half of the medial aspect of thigh are supplied by its sensory branches. Articular branches to the hip and knee joints are also supplied by it.

Interactive Anatomical Interface

Highlight
Femoral Nerve
Thoracic Plexus (T12)
Lumbar plexus
Iliohypogastric Nerve
Ilio-inguinal Nerve
Genitofemoral nerve
Lumbosacral Trunk
Obturator Nerve
Anterior Cutaneous Branches of Femoral Nerve
Lateral Femoral Cutaneous Nerve
Iliacus
Rectus Femoris
Sartorius Muscle
Pectineus muscle
Vastus Lateralis Muscle
Vastus Medialis Muscle
Vastus Intermedius Muscle
Articularis Genus Muscle
Psoas major Muscle
Saphenous Nerve
Medial Crural Cutaneous Nerve
Infrapatellar Branch of Saphenous Nerve

Highlight
Femoral Nerve
Thoracic Plexus (T12)
Lumbar plexus
Iliohypogastric Nerve
Ilio-inguinal Nerve
Genitofemoral nerve
Lumbosacral Trunk
Obturator Nerve
Anterior Cutaneous Branches of Femoral Nerve
Lateral Femoral Cutaneous Nerve
Iliacus

Highlight
Rectus Femoris
Sartorius Muscle
Pectineus muscle
Vastus Lateralis Muscle
Vastus Medialis Muscle
Vastus Intermedius Muscle
Articularis Genus Muscle
Psoas major Muscle
Saphenous Nerve
Medial Crural Cutaneous Nerve
Infrapatellar Branch of Saphenous Nerve
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Related:   Internal Jugular Vein

Obturator Nerve

Obturator Nerve

Course and Distribution

While going through the obturator canal the obturator nerve divides into anterior and posterior sections.

 

Obturator Nerve: Course and Distribution

Obturator Nerve: Course and Distribution

1. The anterior section enters downwards into the thigh in front of the obturator externus. It then descends behind the pectineus and the adductor longus, and in front of the adductor brevis. The anterior section supplies the following muscles:

The anterior section also supplies an articular twig to the hip joint. Distal to the adductor longus, it enters the adductor canal where it gives a twig to the subsartorial plexus of nerves and ends by supplying the femoral artery in the adductor canal.

2. The posterior section enters the thigh by piercing the anterior part of the obturator externus muscle which it supplies. It then descends behind the adductor brevis and in front of the adductor magnus. The posterior section supplies the following muscles:

Its terminal part creates an articular branch termed genicular branch, which pierces the adductor magnus or goes through hiatus for femoral vessels to reach the popliteal fossa where it runs along the popliteal vessels and pierces the oblique popliteal ligament to supply the knee joint.

Clinical Significance

Injury of the Obturator Nerve

The obturator nerve could possibly be injured in the anterior dislocation of the hip joint, orduring radical retropubic prostatectomy. Listed here are the characteristic clinical features:

  • Motor reduction: Decline of adduction of the thigh, because of paralysis of adductor muscles of the thigh.
  • Sensory loss: Sensory loss on the medial aspect of the thigh, because of participation of the cutaneous branch of the anterior section of the obturator nerve.
Related:   Obturator Externus

Obturator Nerve Neuropathy

The syndrome of an obturator nerve entrapment causing the medial thigh pain is described in sportsmen with large adductor muscles.

Surgical Section of the Obturator Nerve

It’s sometimes carried out to alleviate the spasm of adductor muscles in the spastic paralysis.

Annoyance of the Obturator Nerve

The inflammation of the ovary causes localised peritonitis in the region of ovarian fossa which might cause annoyance of the obturator nerve. In this case, the pain could possibly be referred to the hip, knee, and medial side of the thigh.

Referred Pain

In diseases of the hip joint, the pain could be referred to the medial side of the thigh.

Accessory Obturator Nerve

Obturator Nerve: Accessory Obturator Nerve

Obturator Nerve: Accessory Obturator Nerve

 

In about 30% people, accessory obturator nerve originates from the lumbar plexus. It’s created by the ventral sections of the anterior primary rami of L3, L4 spinal nerves. It crosses the superior ramus of pubis deep to pectineus, which it furnishes. It supplies an articular twig to the hip joint and ends by communicating with all the anterior section of the obturator nerve. If small, it supplies only the pectineus muscle.


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By | 2018-08-08T00:00:00+00:00 August 8th, 2018|Anatomy, Lower Limb, Nerves|0 Comments