The palmar cutaneous branch of the median nerve branches off before the carpal tunnel. It innervates the middle of the palm. Ulnar nerve: The ulnar nerve comes from under the tendon of the flexor carpi ulnaris and runs through the ulnar tunnel (or tunnel of Guyon), which is between the pisiform and the hook of the hamate. The ulnar nerve and its dorsal cutaneous, palmar cutaneous, and superficial branches innervate the medial portion of the wrist and hand and the medial one and a half digits. Radial nerve: The radial nerve has two branches in the forearm: The deep branch runs through the posterior part of the forearm, supplying motor innervation to the extensor muscles. The superficial branch is a cutaneous nerve that runs under the brachioradialis muscle and passes through the anatomical snuff box, which is a visible depression formed near the base of the thumb by the tendons of the extensor pollicis longus and extensor pollicis brevis muscles. . The arteries and veins The ulnar and radial arteries carry blood down through the forearm into the wrist, where they anastomose (join together) to form arches. These arches, along with several branches, supply blood to the hand and digits.[9] Here are the arteries that enter the wrist: Anterior interosseous artery: This artery runs from the ulnar artery anterior to the interosseous membrane. It pierces the membrane distally to join the dorsal carpal arch. This branch runs from the ulnar artery over the anterior part Palmar carpal branch: of the wrist under the flexor digitorum profundus tendons. Dorsal carpal branch: This branch runs from the ulnar artery across the back of the wrist under the extensor tendons. Palmar carpal branch: This branch runs from the radial artery across the anterior wrist underneath the flexor tendons. Dorsal carpal branch: This branch runs from the radial artery across the wrist beneath the pollicis and extensor radialis tendons.
The palmar cutaneous branch of the median nerve branches off before the carpal tunnel. It innervates the middle of the palm. Ulnar nerve: The ulnar nerve comes from under the tendon of the flexor carpi ulnaris and runs through the ulnar tunnel (or tunnel of Guyon), which is between the pisiform and the hook of the hamate. The ulnar nerve and its dorsal cutaneous, palmar cutaneous, and superficial branches innervate the medial portion of the wrist and hand and the medial one and a half digits. Radial nerve: The radial nerve has two branches in the forearm: The deep branch runs through the posterior part of the forearm, supplying motor innervation to the extensor muscles. The superficial branch is a cutaneous nerve that runs under the brachioradialis muscle and passes through the anatomical snuff box, which is a visible depression formed near the base of the thumb by the tendons of the extensor pollicis longus and extensor pollicis brevis muscles. . The arteries and veins The ulnar and radial arteries carry blood down through the forearm into the wrist, where they anastomose (join together) to form arches. These arches, along with several branches, supply blood to the hand and digits.[9] Here are the arteries that enter the wrist: Anterior interosseous artery: This artery runs from the ulnar artery anterior to the interosseous membrane. It pierces the membrane distally to join the dorsal carpal arch. Palmar carpal branch: This branch runs from the ulnar artery over the anterior part of the wrist under the flexor digitorum profundus tendons. Dorsal carpal branch: This branch runs from the ulnar artery across the back of the wrist under the extensor tendons. Palmar carpal branch: This branch runs from the radial artery across the anterior wrist underneath the flexor tendons. Dorsal carpal branch: This branch runs from the radial artery across the wrist beneath the pollicis and extensor radialis tendons.
5-RAPOR.docx