Identify the marked muscle ‘A’ in the diagram:
B. Extensor carpi radialis longus
C. Flexor carpi radialis
D. Extensor carpi ulnaris
Answer B. Extensor carpi radialis longus
- The extensor carpi radialis longus muscle emerges from the lateral epicondyle of the humerus and the distal part of the supraepicondylar rim; its tendon enters on the dorsal side of the base of metacarpal II.
- In proximal areas, it is deep to the brachioradialis muscle.
- The wrist is expanded and abducted by the extensor carpi radialis longus muscle.
It is innervated by the radial nerve prior to the nerve splits into superficial and deep sections.
- This muscle has a number of functions.
- It bends an individual’s wrist in manner in which their thumb is getting moved to the inner side of forearm and radius, specifically which indicates its primary action is a radial deviation of the hand.
- It expands and supports the latter throughout grasping motions and in this manner avoids it from flexion. Furthermore, together with the other extensors of wrist