What does the posterior interosseous nerve innervate?

The posterior interosseous nerve is a motor nerve and sequentially innervates supinator, extensor carpi radialis brevis, extensor digitorum communis, extensor digiti minimi, extensor carpi ulnaris, abductor pollicis, extensor pollicis brevis, extensor pollicis longus, and extensor indicis.

What is the function of the posterior interosseous nerve?

The posterior interosseous nerve provides sensory fibers to the dorsal aspect of the wrist capsule, arising in a separate fascicle sheath from the deep radial aspect in the fourth extensor compartment. The nerve does not provide cutaneous branches.

What does the interosseous nerve innervate?

The anterior interosseous nerve provides motor innervation to the deep muscles in the anterior compartment of the forearm, including: Flexor pollicis longus. Flexor digitorum profundus – lateral aspect only (the medial aspect of this muscle is supplied by the ulnar nerve) Pronator quadratus.

What does the posterior interosseous supply?

Supply. The posterior interosseous nerve supplies all the muscles of the posterior compartment of the forearm, except anconeus muscle, brachioradialis muscle, and extensor carpi radialis longus muscle.

Is posterior interosseous nerve sensory or motor?


The posterior interosseous nerve (PIN) is purely motor except for sensory fibers from the muscles it innervates and joint structures. The nerve can be traumatized in proximal fractures of the radius and ulna, but the more common etiology is compression of the nerve as it passes through the supinator muscle.

Is the posterior interosseous nerve a radial nerve?

The posterior interosseous nerve is a branch of the radial nerve, which comes off the posterior cord of the brachial plexus. With nerve roots C5 to T1, the radial nerve travels down the arm and divides into superficial and deep branches in the proximal forearm.

What nerve Innervates the supinator?

the radial nerve

Supinator is innervated by the posterior interosseous nerve (C7, C8), a branch of the radial nerve.

What is Musculocutaneous nerve?

The musculocutaneous nerve innervates the three muscles of the anterior compartment of the arm: the coracobrachialis, biceps brachii, and brachialis. It is also responsible for cutaneous innervation of the lateral forearm.

What is anterior interosseous?

The anterior interosseous nerve (volar interosseous nerve) is a branch of the median nerve that supplies the deep muscles on the anterior of the forearm, except the ulnar (medial) half of the flexor digitorum profundus.

What does anterior interosseous nerve supply?

The anterior interosseous nerve (AIN) is a purely motor branch of the median nerve (Fig. 81.8). It innervates the pronator quadratus, the flexor pollicis longus, and the flexor digitorum profundus to the index finger. The nerve branches off from the median nerve about 6 cm below the lateral epicondyle.

What nerve innervates the flexor digitorum superficialis?

the median nerve

Flexor digitorum superficialis is innervated by muscular branches of the median nerve, derived from roots C8 and T1 that arises from the medial and lateral cords of the brachial plexus. The skin that overlies the muscle is supplied by roots C6-8 and T1.

Which nerve innervates the muscles of the posterior compartment of the forearm?

the radial nerve

Innervation. The muscles of the posterior compartment of the forearm are innervated by the radial nerve and its branches. The radial nerve arises from the posterior cord of the plexus. The somatomotor fibers of the radial nerve branch from the main radial nerve at the level of the radial groove of the humerus.

What does the median nerve innervate?

The median nerve predominantly provides motor innervation to the flexor muscles of the forearm and hand as well as those muscles responsible for flexion, abduction, opposition, and extension of the thumb.

What nerve innervates the posterior deltoid?

axillary nerve

The anterior branch of the axillary nerve winds round the humerus deep to the deltoid muscle, and also innervates the muscle at this point. The posterior branch of the axillary nerve innervates the teres minor and also the deltoid.

What is innervated by the ulnar nerve?

The ulnar nerve innervates the flexor muscles of the forearm including the flexor carpi ulnaris and flexor digitorum profundus. It also innervates the intrinsic muscles of the hand including the palmaris brevis, lumbricals, hypothenar and interossei muscles.

What does the femoral nerve innervate?

The motor branches of the femoral nerve are the nerve to pectineus, nerve to sartorius and muscular branches to the quadriceps femoris. They innervate the flexors of the hip (pectineus, iliacus, sartorius) and the extensors of the knee (quadriceps femoris).

What Innervates posterior thigh?

the sciatic nerve

As the sciatic nerve pierces the greater sciatic foramen, it travels down the posterior thigh posterior to the long head of the biceps femoris. [2] The sciatic nerve and its two branches provide all motor innervation to the posterior thigh.

What nerve is on the posterior aspect of the femur?

The posterior division of the femoral nerve has a sensory nerve, four motor branches, and nerves to the hip and knee joints (articular branches). The sensory nerve is called the saphenous nerve and is the largest cutaneous branch of the femoral nerve.

What does the tibial nerve innervate?

In addition to the two heads of the gastrocnemius muscle, the tibial nerve innervates the plantaris, soleus, popliteus, posterior tibialis, flexor digitorum longus, and flexor hallucis longus muscles (Fig. 1).

What nerve Innervates tibialis posterior?

The tibial nerve

The tibial nerve provides innervation to the muscles of the lower leg and foot. Specifically: triceps surae (the two headed gastocnemius and soleus), plantaris, Popliteus, tibialis posterior, flexor digitorum longus and flexor hallucis longus. It also has articular and cutaneous branches.

What is the posterior tibial nerve?

The posterior tibial nerve is a mixed motor and sensory nerve and courses around the medial malleolus and below the flexor retinacula in the tarsal tunnel. Distal to the medial malleolus, it divides into its terminal branches: lateral plantar, medial plantar, and calcaneal.