| 释义 |
DictionarySeemedianEncyclopediaSeenervemedian nerve
me·di·an nerve [TA] formed by the union of medial and lateral roots from the medial and lateral cords of the brachial plexus, respectively; it supplies all the muscles in the anterior compartment of the forearm with the exception of the flexor carpi ulnaris and ulnar half of the flexor digitorum profundus; it passes through the carpal tunnel to supply the thenar muscles (except adductor pollicis and the deep head of flexor pollicis brevis) via its recurrent thenar branch; its sensory fibers are distributed to the skin of the palmar and distal dorsal aspects of the radial three-and-a-half digits and adjacent palm. The median nerve is most commonly injured through compression in carpal tunnel syndrome, resulting in a loss of ability to oppose the thumb (thus creating "ape hand") and loss of sensation over the radial portion of the hand. Synonym(s): nervus medianus [TA]median nerve A primarily sensory nerve of the arm, located at the medial and lateral cords of the brachial plexus at C6–T1 of the brachial plexus.
Route
Deep within the medial bicipital furrow to the cubital fossa, passing between the two heads of the pronator teres, then descending deep to the superficial flexor of the digits and flexor retinaculum.
Branches, forearm
• Anterior interosseous branch.
• Palmar cutaneous branch.
Branches, hand
• Recurrent branch to muscles of the thenar compartment, which innervates the flexor pollicis bevis, abductor pollicis brevis and opponens pollicis.
• Digital cutaneous branches, which supply the:
– Lateral (radial) three and a half digits on palmar side;
– Index, middle and ring finger on dorsum of hand.
• Motor innervation to the first and second lumbricals of hand.me·di·an nerve (mē'dē-ăn nĕrv) [TA] Formed by the union of medial and lateral roots from the medial and lateral cords of the brachial plexus, respectively; it supplies all the muscles in the anterior compartment of the forearm with the exception of the flexor carpi ulnaris and ulnar half of the flexor digitorum profundus; it passes through the carpal tunnel to supply the thenar muscles (except adductor pollicis and the deep head of flexor pollicis brevis) via its recurrent thenar branch; its sensory fibers are distributed to the skin of the palmar and distal dorsal aspects of the radial three-and-a-half digits andadjacent palm. The median nerve is most commonly injured through compression in carpal tunnel syndrome, resulting in a loss of ability to oppose the thumb (thus creating "ape hand") and loss of sensation over the radial portion of the hand. median nerve One of the two major nerves of the arm, supplying most of the muscles and providing sensation in the two-thirds of the hand on the thumb side.Median nerveA nerve which runs through the wrist and into the hand. It provides sensation and some movement to the hand, the thumb, the index finger, the middle finger, and half of the ring finger.Mentioned in: Carpal Tunnel Syndromeme·di·an nerve (mē'dē-ăn nĕrv) [TA] Formed by the union of medial and lateral roots from the medial and lateral cords of the brachial plexus, respectively; it supplies all the muscles in the anterior compartment of the forearm with the exception of the flexor carpi ulnaris and ulnar half of the flexor digitorum profundus. AcronymsSeeminute |