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Types of wrist drop are distinguished by the nerves affected: Weakness of brachioradialis, wrist extension and finger flexion = radial nerve lesion; Weakness of finger extension and radial deviation of the wrist on extension = posterior interosseous nerve lesion; Weakness of triceps, finger extensors and flexors = c7,8 lesion
The extensor carpi radialis longus is a wrist extensor that is innervated by the radial nerve, [2] [3] from spinal roots C6 and C7. [4] All other major extensor muscles in the superficial layer of the posterior compartment (the extensor digitorum , extensor carpi radialis brevis , extensor carpi ulnaris , and extensor digiti minimi ) are ...
Nerve Action Antagonist Gray's Extensor carpi radialis longus lateral supracondylar ridge: 2nd metacarpal, base radial: radial: extends, abducts wrist: FCRM: s125p452: Extensor carpi radialis brevis common extensor tendon 3rd metacarpal, base radial nerve, deep branch: Extensor digitorum extensor expansion of 2nd–5th middle, distal phalanges [7]
The radial nerve innervates the finger extensors and the thumb abductor; that is, the muscles that extend at the wrist and metacarpophalangeal joints (knuckles) and abduct and extend the thumb. The median nerve innervates the flexors of the wrist and digits, the abductors and opponens of the thumb, the first and second lumbricals. The ulnar ...
Loss of wrist extension is due to paralysis of the posterior compartment of forearm muscles; although the elbow extensors are also innervated by the radial nerve, their innervation is usually spared because the compression occurs below, distal, to the level of the axillary nerve, which innervates the long head of the triceps, and the upper ...
The extensor digitorum muscle (also known as extensor digitorum communis) [2] is a muscle of the posterior forearm present in humans and other animals. It extends the medial four digits of the hand. Extensor digitorum is innervated by the posterior interosseous nerve, which is a branch of the radial nerve. [3]
It can be compressed against the humerus by crutches, causing crutch paralysis. Symptoms of damage to the deep branch of the radial nerve typically include "wrist drop", which is the extension of fingers, hand, and wrist, since the extensor muscles supplied by the nerve are paralyzed.
The supinator and the anconeus are the two extensor muscles in the posterior compartment of the forearm that do not pass through wrist extensor compartments. [3] The first compartment locating the most radial is occupied by the extensor pollicis brevis and the abductor pollicis longus to insert to the thumb.
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