Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Plate 4.6

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed

This section is one below the preceding one (1 cm), and the next series of sections concern the elbow region.

Triceps brachii is decreasing in size, and a thick vertical tendinous band is forming between the long (8) and lateral (6) heads of triceps brachii.

The biceps brachii has become tendinous (17). Part of the tendon will form a thin flat band of connective tissue joining the antebrachial fascia called the lacertus fibrosus; the remainder forms a thick band, the biceps tendon, which will insert onto the biceps tuberosity of the radius in the forearm.

The nerve supply to the muscles of the forearm and hand is provided by the radial, median, and ulnar nerves. The radial nerve (4) supplies the extensor (dorsal) forearm muscles. The median nerve (13) supplies all of the flexor forearm muscles except the medial half of flexor digitorum profundus and flexor carpi ulnaris, which are supplied by the ulnar nerve (9). In addition, the median nerve usually supplies the thumb (intrinsic hand) muscles and the first and second lumbrical muscles. The remainder of the hand is usually supplied by the ulnar nerve (9).

Next Page | Previous Page | Section Top | Title Page

URL: http://www.anatomyatlases.org/