What muscles 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 does anterior interosseous nerve innervate?
The AIN innervates three muscles in the forearm: flexor pollicis longus (FPL), pronator quadratus (PQ), and the radial half of flexor digitorum profundus (FDP).
How do you treat anterior interosseous nerve?
The general consensus for managing AIN syndrome includes a period of rest, observation, and splinting of the elbow near 90 degrees of flexion (or position of most comfort for the patient). The majority of patients will experience improvement between 6 and 12 weeks of activity modification.
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.
Where is the interosseous nerve located?
proximal forearm
The anterior interosseous nerve (AIN) is the terminal motor branch of the median nerve. It branches from the median nerve in the proximal forearm just below to the elbow joint. It is about 5–8 cm distal to the lateral epicondyle and 4 cm distal to the medial epicondyle.
What is Guyon’s syndrome?
Guyon’s canal syndrome refers to compression of the ulnar nerve while it passes from the wrist into the hand through a space called the ulnar tunnel or Guyon’s canal. Guyon’s canal syndrome is also called ulnar tunnel syndrome or handlebar palsy.
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.
Where is anterior interosseous?
Where does anterior interosseous nerve get entrapped?
The most common site of AIN entrapment/compression is the tendinous edge of the deep head of the pronator teres muscle.
What compresses the anterior interosseous nerve?
The anterior interosseous nerve may be compressed by the following structures: Struthers ligament. Bicipital aponeurosis. Fibrous arch of the pronator teres muscles (between the superficial & deep heads)