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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 ...
humeral head: medial epicondyle of humerus (common flexor tendon) ulnar head: coronoid process of ulna: pronator tuberosity of radius: ulnar artery, radial artery: median nerve: pronates forearm, flexes elbow: supinator: 2 1 flexor carpi radialis: Upper limb, Forearm, Anterior compartment, Superficial, Right/left medial epicondyle of humerus ...
Flexor digitorum profundus is a flexor of the wrist , metacarpophalangeal and interphalangeal joints. [2] The lumbricals, intrinsic muscles of the hand, attach to the tendon of flexor digitorum profundus. Thus, the flexor muscle is used to aid the lumbrical muscles in their role as extensors of the interphalangeal joints.
Due to a common interconnection between the median and ulnar nerves in the hand (Riche-Cannieu interconnection), the median nerve may innervate the flexor pollicis brevis in 35% of people. It is innervated by the ulnar nerve in 50% of people and by both the median and ulnar nerves in 15%.
The lumbrical innervation always follows the innervation pattern of the associated muscle unit of flexor digitorum profundus (i.e. if the muscle units supplying the tendon to the middle finger are innervated by the median nerve, the second lumbrical will also be innervated by the median nerve).
Cutaneous innervation of the upper limbs is the nerve supply to areas of the skin of the upper limbs (including the arm, forearm, and hand) which are supplied by specific cutaneous nerves. Modern texts are in agreement about which areas of the skin are served by which cutaneous nerves, but there are minor variations in some of the details.
Flexor digitorum superficialis and profundus, lumbricals, and interossei, assisted in the case of the little finger by the flexor digiti minimi brevis: extensor digitorum communis, extensor indicis proprius, and extensor digiti minimi muscle: thumb: flexor pollicis longus and brevis: extensor pollicis longus and brevis
Motor innervation of upper limb by the five terminal nerves of the brachial plexus: [13] The musculocutaneous nerve innervates all the muscles of the anterior compartment of the arm. The median nerve innervates all the muscles of the anterior compartment of the forearm except flexor carpi ulnaris and the ulnar part of the flexor digitorum ...