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The obturator nerve is a major peripheral nerve of the lower limb, innervating all the muscles in the medial compartment of the thigh, except the hamstring part of the adductor magnus, which is supplied by the tibial nerve. The obturator nerve arises from the lumbar plexus on the posterior abdominal wall and descends through the pelvis to the medial compartment of the thigh. It divides into anterior and posterior branches, which are separated by the adductor brevis muscle. The obturator nerve is responsible for the motor and sensory functions of the lower limb, and its entrapment can cause exercise-induced medial thigh pain, typically in athletes.
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What You'll Learn
- The obturator nerve is a peripheral nerve of the lower limb
- The obturator nerve innervates the adductor longus, gracilis, and adductor brevis muscles
- The adductor magnus is innervated by both the obturator and sciatic nerves
- Obturator nerve block is used to manage pain after lower limb surgery
- The obturator nerve provides sensory innervation to the medial upper thigh
The obturator nerve is a peripheral nerve of the lower limb
The obturator nerve is a major peripheral nerve of the lower limb. It provides sensory innervation to the medial upper thigh and articular branches to the hip and knee. The obturator nerve arises from the lumbar plexus on the posterior abdominal wall, with roots L2-L4.
The nerve descends medial to the psoas major, passing through the obturator canal, where it divides into anterior and posterior divisions. The anterior division exits the obturator canal to enter the medial compartment of the thigh. The posterior division exits through the obturator externus. In the medial compartment of the thigh, the nerve divides into anterior and posterior branches, which are separated by the adductor brevis muscle.
The obturator nerve innervates all the muscles in the medial compartment of the thigh, except the hamstring part of the adductor magnus, which is innervated by the tibial nerve. The obturator nerve innervates the adductor longus, gracilis, adductor brevis, and occasionally the pectineus. It also innervates the obturator externus and adductor magnus muscles.
Entrapment of the obturator nerve can cause exercise-induced medial thigh pain, typically in athletes. Obturator nerve block is a procedure used to manage pain after lower limb surgery or chronic hip pain.
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The obturator nerve innervates the adductor longus, gracilis, and adductor brevis muscles
The obturator nerve is a major peripheral nerve of the lower limb. It provides sensory innervation to the medial upper thigh and articular branches to the hip and knee. The obturator nerve is also used in pain management after lower limb surgery or for chronic hip pain.
The obturator nerve also innervates the obturator externus and adductor magnus muscles. The adductor magnus is a large triangular muscle situated on the medial side of the thigh. It is composed of two parts: the adductor part and the hamstring part. The adductor part is innervated by the obturator nerve, while the hamstring part is innervated by the tibial component of the sciatic nerve.
The obturator nerve arises from the lumbar plexus on the posterior abdominal wall and descends medial to the psoas major muscle. It then divides into anterior and posterior divisions, with the anterior division exiting the obturator canal to enter the medial compartment of the thigh. The posterior division exits through the obturator externus muscle.
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The adductor magnus is innervated by both the obturator and sciatic nerves
The adductor magnus is a large, powerful, triangular muscle, situated on the medial side of the thigh. It is the largest and most posterior of the medial thigh compartment muscles. The adductor magnus consists of two parts: the adductor part and the ischiocondylar (hamstring) part. The adductor part is considered to be part of the medial thigh (adductor) compartment, while the hamstring part belongs to the posterior compartment of the thigh.
The adductor part of the adductor magnus is innervated by both the obturator and sciatic nerves. The obturator nerve is a major peripheral nerve of the lower limb. It provides sensory innervation to the medial upper thigh and articular branches to the hip and knee. The sciatic nerve, meanwhile, has a tibial component that innervates the hamstring part of the adductor magnus.
The obturator nerve arises from the lumbar plexus on the posterior abdominal wall, with roots L2-L4. It pierces the obturator externus muscle and then descends in a plane between the adductor brevis and adductor magnus. The obturator nerve innervates the obturator externus and adductor magnus muscles. It also innervates most muscles in the adductor compartment.
The sciatic nerve, on the other hand, has a more complex structure. The tibial portion of the sciatic nerve (L4) innervates the hamstring segment of the adductor magnus. This segment is named for its similarity in structure, proximal attachment, and innervation to the hamstring muscles.
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Obturator nerve block is used to manage pain after lower limb surgery
The obturator nerve is a major peripheral nerve of the lower limb. It provides sensory innervation to the medial upper thigh and articular branches to the hip and knee joints. The obturator nerve innervates the obturator externus, adductor brevis, adductor longus, gracilis, and adductor magnus muscles. The adductor part of the adductor magnus is innervated by both the obturator and sciatic nerves.
Obturator nerve block is a procedure used to manage pain after lower limb surgery or for chronic hip pain. The obturator nerve block can be used in conjunction with a femoral nerve block to significantly reduce pain and opioid consumption after knee arthroplasty. It can also be used to treat acute pain, supplementing femoral and sciatic nerve blocks for surgical procedures on the lower extremity. The obturator nerve block can also help reduce postoperative pain following knee surgery.
The obturator nerve block can be used to treat chronic hip pain, which may develop following hip surgery, hip replacement, or trauma to the hip. It can also be used to relieve adductor muscle spasms, hip pain associated with cerebral palsy, and muscle spasms associated with paralysis of the legs. The obturator nerve block is also occasionally used in urologic surgery to suppress the obturator reflex during transurethral procedures.
The obturator nerve block is a technically difficult block due to wide anatomical variance. The obturator nerve is located deep within the body, and it may be difficult to obtain the optimum position of a rotated and abducted leg due to lower limb spasticity. The inguinal approach to the obturator nerve block is easier to perform and more comfortable for the patient. The needle insertion site is away from the intrapelvic contents, resulting in a lower risk of complications.
The obturator nerve block can be performed under ultrasound guidance, which is more reliable than landmark techniques. The recommended anesthetic technique for lower limb surgeries consists of the administration of medium- to long-lasting local anesthetics associated with adequate postoperative analgesia, such as bupivacaine, ropivacaine, or levobupivacaine.
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The obturator nerve provides sensory innervation to the medial upper thigh
The obturator nerve is a major peripheral nerve of the lower limb. It provides sensory innervation to the medial upper thigh and articular branches to the hip and knee. The obturator nerve arises from the lumbar plexus on the posterior abdominal wall, with roots L2-L4.
The obturator nerve innervates all the muscles in the medial compartment of the thigh, except the hamstring part of the adductor magnus, which is innervated by the tibial nerve. The obturator nerve pierces the fascia lata to become the cutaneous branch, which supplies the skin of the middle part of the medial thigh.
The obturator nerve has an important role in the function of the hip adductors, which are a group of muscles that produce adduction of the thigh at the hip joint. These muscles extend from the anteroinferior external surface of the bony pelvis to the shaft of the femur and proximal tibia. The hip adductors are innervated predominantly by the obturator nerve, with roots L2-L4.
The adductor magnus is a large, fan-shaped sheet of muscle and is the largest of the hip adductors. It consists of two parts: the adductor part and the hamstring part. The adductor part of the adductor magnus is innervated by the posterior division of the obturator nerve, while the hamstring part is innervated by the tibial portion of the sciatic nerve.
Entrapment of the obturator nerve can cause exercise-induced medial thigh pain, typically in athletes. This can be treated conservatively with stretching and strengthening exercises, or in some cases, neurolysis or neurectomy may be considered.
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Frequently asked questions
The obturator nerve innervates the adductor muscles.
The obturator nerve innervates the adductor brevis, adductor longus, gracilis, and occasionally the pectineus.
The obturator nerve does not innervate the hamstring part of the adductor magnus. This is innervated by the tibial nerve.
