![]() As the muscles taper toward tendons near the wrist, the nerve assumes an increasingly superficial position until it is located beneath the flexor retinaculum in the carpal tunnel with the tendons of the flexor digitorum profundus, flexor digitorum superficialis, and flexor pollicis longus. The median nerve crosses the elbow medial to the brachial artery and courses toward the wrist deep to the flexor digitorum superficialis in the center of the forearm. Three individual nerves are involved in a wrist nerve block: the median, ulnar, and radial nerves. In addition to providing anesthesia and analgesia, wrist nerve blocks using botulinum toxin to treat hyperhidrosis have been described. Since the nerves are located relatively close to the surface, this is a technically easy nerve block to perform, but knowledge of the anatomy of the soft tissues of the wrist is essential for successful block with minimum patient discomfort. Traditional wrist nerve block technique involves advancing needles using surface landmarks toward the three nerves that supply the hand: the median, ulnar, and radial nerves. ![]() The wrist nerve block is an effective method to provide anesthesia of the hand and fingers without the arm immobility that occurs with more proximal brachial plexus nerve blocks. Transducer and needle positions for (A) median nerve block (B) ulnar nerve block (C) radial nerve block. The five palmar digital branches supply the skin of the palmar surface of lateral 3 ½ digits including the nail beds and the skin on the dorsum of the distal phalanx. Sensory branches : Two palmar digital branches.Sensory branches: Three palmar digital branches.Motor branches :A recurrent branch that supplies thenar muscles ( abductor pollicis brevis, flexor pollicis brevis and opponens pollicis) except adductor pollicis.Before entering carpal tunnel it gives off palmar cutaneous branch ( passes superficial to flexor retinaculum) which supplies skin over thenar eminence and lateral part of palm.Lateral half of the flexor digitorum profundus.Anterior interosseous branch supplies 2 ½ muscles:.Gives branches f rom its medial side to the all the superficial flexors ( pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis) of th.Name the branches and structures supplied by median nerve. It then enters the palm through the carpal tunnel (deep to flexor retinaculum) and divides into lateral and medial terminal branches.proximal to flexor retinaculum it becomes superficial and lies lateral to the tendons of flexor digitorum superficialis. In the forearm, it passes behind the tendinous arch of flexor digitorum superficialis and runs downwards deep to the muscle.It leaves the cubital fossa by passing between the two heads of the pronator teres and gives off anterior interosseous nerve. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |