Where do femoral and obturator nerves originate?
Both these nerves arise from the lumbar plexus, which lies up here within the thickness of the psoas major muscle. The femoral nerve emerges lateral to psoas major, the obturator nerve medial to it. We'll follow the femoral nerve.
What plexus does the obturator nerve originate from?
The obturator nerve arises from the lumbar plexus and provides sensory and motor innervation to the thigh. The obturator nerve : Provides motor innervation to the medial compartment of the thigh.
What is the distribution of the obturator nerve?
The obturator nerve divides into anterior and posterior divisions of the obturator nerve. These divisions both provide skeletal musculature innervation, and the anterior division terminates as the cutaneous branch of the obturator nerve.
What is the origin and insertion of the obturator externus?
Obturator externus muscle is a flat, triangular, paired muscle of the gluteal region....Obturator externus muscle.OriginAnterior surface of obturator membrane, bony boundaries of obturator foramenInsertionTrochanteric fossa of femur3 more rows
Where does the obturator nerve begin and end?
The obturator nerve is derived from L2-4 and travels along the medial border of the iliopsoas muscle; it is both a motor and a sensory nerve. It travels through the obturator foramen with the obturator artery and vein into the thigh. The obturator nerve divides into anterior and posterior branches.
What is the correct origin and termination for the obturator nerve?
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.
Which muscle is partially paralyzed with the obturator nerve damage?
The nerve has no sensory function. Partial or complete paralysis affects the adductor muscles, with consequent loss of function.
Where does the femoral nerve originate?
The femoral nerve: Originates from L2 to L4 nerve roots in the lumbar plexus. Enters the femoral triangle, a hollow, wedge-shaped area between the upper thigh and groin. The femoral nerve, femoral artery, femoral vein and lymphatic vessels go through this triangle.
What spinal nerves is the obturator nerve?
The obturator nerve is one of the largest branches of the lumbar plexus. It is a mixed nerve which arises from the ventral (anterior) rami of the spinal nerves L2-L4. Motor: Adductor longus, adductor brevis, gracilis, obturator externus and ischiocondylar part of adductor magnus muscle.
Which is the origin of the obturator internus?
Origin. The obturator internus muscle originates from the inferior margin of the superior pubic ramus and from the pelvic surface of the obturator membrane.
What is origin of piriformis?
The piriformis muscle is pyramidal in shape and originates from the anterior surface of the S2–S4 sacral vertebrae, the capsule of the sacroiliac joint, and the gluteal surface of the ilium near the posterior surface of the iliac spine.
What is the origin of the Pectineus?
Pectineus muscleOriginSuperior pubic ramus (pectineal line of pubis)InsertionPectineal line of femur, linea aspera of femurActionHip joint: Thigh flexion, thigh adduction, thigh external rotation, thigh internal rotation; pelvis stabilizationInnervationFemoral nerve (L2, L3) (Obturator nerve (L2, L3))1 more row•Jun 22, 2020
Overview
Your obturator nerve is one of many peripheral nerves that run through your groin. It’s part of your peripheral nervous system. This system helps your brain communicate with the rest of your body.
Function
This nerve provides motor (muscle movement) and sensory (sensation) innervation to your inner thigh.
Anatomy
Nerve fibers that make up your obturator nerve start in the lower part of your spine. This includes spine bones (vertebrae) L2, L3 and L4.
Conditions and Disorders
One of the main issues of an obturator nerve injury is neuropathic pain. Conditions that cause it include:
Care
It might not be possible to prevent some causes of obturator neuropathy. Trauma from childbirth or crush injuries can be out of your control.
Where is the obturator nerve located?
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.
What is the function 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).
What is the obturator nerve?
The Obturator Nerve. The obturator nerve is a major peripheral nerve of the lower limb. In this article, we shall look at the anatomy of the obturator nerve – its anatomical course, functions and clinical correlations.
Where does the obturator nerve travel?
It then travels posteriorly to the common iliac arteries and laterally along the pelvic wall – towards the obturator foramen of the pelvis.
What nerve is in the middle of the thigh?
The cutaneous branch of the obturator nerve supplies the skin of the middle part of the medial thigh. The obturator nerve can be damaged during surgery involving the pelvis or abdomen. Symptoms include numbness and paraesthesia on the medial aspect of the thigh and weakness in adduction of the thigh.
What nerve innervates the hamstring?
Motor Functions. The obturator nerve innervates all the muscles in the medial compartment of the thigh - except the hamstring part of the adductor magnus (innervated by the tibial nerve). They are collectively known as the hip adductors: Adductor longus - adducts thigh.
What is the anterior division of the adductor?
Anterior division (anterior to the adductor brevis): Descends in a plane between the adductor longus and adductor brevis (towards the femoral artery). Here, it supplies motor fibres to the adductor longus, adductor brevis and gracilis. It can also supply the pectineus muscle.
Which nerve pierces fascia lata?
It then pierces the fascia lata to become the cutaneous branch of the obturator nerve. Pierces the obturator externus muscle, and then descends in a plane between the adductor brevis and adductor magnus. Innervates the obturator externus and adductor magnus muscles.
Which nerve innervates the medial thigh?
The obturator nerve innervates all the muscles in the medial compartment of the thigh – except the hamstring part of the adductor magnus (innervated by the tibial nerve). Fig 4 – Muscles of the medial thigh. The overlying muscles in the anterior compartment have been removed.
Where does the obturator nerve start?
The obturator nerve begins at the medial border of the psoas major muscle. It travels through the obturator foramen (an opening in the pelvic bone) before entering the thigh, where it branches into two parts, an anterior branch and posterior branch.
Where does the obturator nerve enter the obturator canal?
The obturator nerve emerges from the medial side of the psoas major, then it crosses the linea terminalis and passes by the lateral wall of the lesser pelvis. The obturator nerve enters the obturator canal and divides into two terminal branches: the anterior and the posterior branch. The anterior branch of the obturator nerve is larger than ...
Which muscle is innervated by the anterior branch of the adductor brevis muscle?
On the anterior surface of the adductor brevis muscle the anterior branch travels underneath the pectineus and adductor longus muscles to innervate the adductor longus, gracilis, and adductor brevis muscles. This branch also often contribute to the pectineus muscle. The cutaneous branches innervate the skin on the medial thigh.
Which nerve innervates the hamstring?
The obturator nerve innervates all the muscles in the medial compartment of the thigh – except the hamstring part of the adductor magnus (innervated by the tibial nerve). They are collectively known as the hip adductors: Adductor longus – adducts thigh. Adductor brevis – adducts thigh. Adductor magnus:
Which nerve innervates the adductor brevis?
The anterior branch of the obturator nerve innervates the adductor brevis, adductor longus, pectineus and gracilis, also the skin at the medial part of the thigh as far as the knee joint. The posterior branch of the obturator nerve runs posterior to the adductor brevis.
Which nerve runs between the adductor brevis and the adductor longus muscles?
The anterior branch of the obturator nerve is larger than the posterior, it runs between the adductor brevis and adductor longus muscles, then penetrates the fascia lata at the middle third of the medial surface of the thigh and continues as the cutaneous branch. The anterior branch of the obturator nerve innervates the adductor brevis, ...
Which muscle is innervated by the medial compartment of the thigh?
Motor functions: Innervates the muscles of the medial compartment of the thigh (obturator externus, adductor longus, adductor brevis, adductor magnus and gracilis).
Where does the obturator nerve come from?
The obturator nerve arises from the lumbar plexus on the posterior abdominal wall and descends within the psoas muscle, emerging from the medial margin of the muscle to enter the pelvis. The nerve path continues by following along the lateral wall of the pelvis, passing through the obturator canal, to enter the medial compartment of the thigh.
Which muscle is innervated by the anterior branch of the adductor brevis muscle?
On the anterior surface of the adductor brevis muscle the anterior branch travels underneath the pectineus and adductor longus muscles to innervate the adductor longus, gracilis, and adductor brevis muscles. This branch also often contribute to the pectineus muscle. The cutaneous branches innervate the skin on the medial thigh.
Which muscle is the anterior and posterior branch of the adductor?
From here the nerve divides into the anterior and posterior branch which are separated by the adductor brevis muscle . The posterior branch travels underneath the adductor muscle along the anterior surface of the adductor magnus muscle, innervating the obturator externus, adductor brevis, as well as part of the adductor magnus muscle ...
Can a obturator nerve be damaged?
Injury to the nerve is rare as it lies deep within the pelvis and medial thigh. It can be damaged through direct injury to the nerve or to surrounding muscle tissue. Mild damage to the obturator nerve can be treated with physiotherapy. More severe cases may require surgery.
Where does the obturator nerve originate?
Origin: Obturator nerve arises from lumbar plexus. Root value: It is formed by ventral division of the ventral rami of L2, L3, L4 spinal nerves.
What are the branches of the obturator nerve?
Enumerate the branches of obturator nerve. Branches of anterior division of obturator nerve: Muscular branches to gracilis, adductor longus, medial part of pectineus, and usually to adductor brevis. Sensory innervation to skin of upper part of medial aspect of thigh. Articular branch to hip joint.
Where is the obturator externus located?
Relations. Obturator externus is located in the pelvis on the anterior aspect of the innominate bones. It covers the obturator foramen and is located deep to pectineus and superior parts of the adductors of the thigh. Its tendon lies deep to the quadratus femoris muscle and separates it from the neck of the femur.
What is the function of the obturator externus?
The obturator externus performs a few different actions. It externally rotates the femur when the hip is extended, but when the hip is flexed it actually abducts the thigh. Together with other short muscles around the hip joint, it contributes to the joint stability.
What is the role of the obturator externus in walking?
This action is especially useful in climbing. It is also believed to play a role in walking, counteracting the medial rotation caused by the anterior adductors of the thigh. When the hip joint is flexed, i.e. the thigh is closer to the body, obturator externus muscle abducts the thigh.
Where is the tendon located in the femur?
Its tendon lies deep to the quadratus femoris muscle and separates it from the neck of the femur. The obturator vessels (anterior and posterior branches of the obturator artery and vein) are found deep to the obturator externus muscle, on the external surface of the obturator membrane.
Which artery supplies the obturator externus?
Obturator externus is supplied by the anterior branch of the obturator artery and medial circumflex femoral artery. These blood vessels form a variable pattern, meaning the muscle may receive blood supply from both or just one of these vessels.
Which nerve passes over the anterior surface of the muscle?
There are also nerves travelling in close proximity to this muscle. The anterior branch of the obturator nerve passes over the anterior surface of the muscle while the posterior branch pierces the muscle, before both branches descend to innervate the muscles of the thigh.
Where does the femoral tendon travel?
The fibers of the muscle converge into a single tendon, which travels in a groove on the inferior aspect of the acetabulum. It then proceeds superolaterally on the posterior aspect of the femoral head and inserts into the trochanteric fossa of the femur.
