. Chordate morphology. Morphology (Animals); Chordata. ABC Figure 14-11. Three stages in the development ot the supracoracoideus of the opossum. (After Cheng, 1955) concealed by the supracoracoideus are the two heads of the biceps muscle and the fleshy belly of the coracobrachialis brevis. The coracobrachialis longus arises from the inner surface of the coracoid, behind the level of the glenoid fossa (socket for humerus). The coracobrachialis longus inserts with the biceps and on the proximal end of the humerus adjacent to its origin. On the inner aspect of the pectoral girdle is a large subsc
. Chordate morphology. Morphology (Animals); Chordata. ABC Figure 14-11. Three stages in the development ot the supracoracoideus of the opossum. (After Cheng, 1955) concealed by the supracoracoideus are the two heads of the biceps muscle and the fleshy belly of the coracobrachialis brevis. The coracobrachialis longus arises from the inner surface of the coracoid, behind the level of the glenoid fossa (socket for humerus). The coracobrachialis longus inserts with the biceps and on the proximal end of the humerus adjacent to its origin. On the inner aspect of the pectoral girdle is a large subscapularis which is joined with the teres major (Figure 14-14). The upper arm muscles consist of the brachialis, biceps, and triceps. The latter has three heads: lateralis, longum, and medialis. The forearm muscles are simpler than those of the mam- mal (Figure 14-13). The dorsal layer consists of an anterior, two-parted extensor carpi radialis, a middle (and super- ficial) extensor digitorum, and a posterior extensor carpi ulnaris. The carpi radialis, which includes the su- pinator, inserts along the length of the radius. Below the ex- tensor digitorum is the abductor and extensor poUicis brevis, which inserts both at the base and further out on the first digit. Associated with this muscle, and arising from the region of the ulnare, are short extensors (and interosseus muscles) of the digits II to V. On the ventral aspect of the forearm (Figure 14-15), from front to back margin, are a flexor carpi radialis, a palmaris longus, one or more heads of a flexor digitorum, and a flexor carpi ulnaris. The flexor radialis (includes the pro- nator teres) inserts distally on the radius and on the radiale. The flexor ulnaris is bound to the extensor ulnaris and in- serts on the pisiforme bone and through this movable ele- ment on the rear margin of the hand. The palmar fascia is thick and covered externally with distinct short for the digits. With the exception of that of
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