Myogale triceps subsp. brachii

WHIDDEN, HOWARD P., 2000, Comparative Myology of Moles and the Phylogeny of the Talpidae (Mammalia, Lipotyphla), American Museum Novitates 3294, pp. 1-53 : 25-26

M. triceps brachii , caput medialis ( figs.

10 and 12 )

ORIGIN: A superficial layer from the anterior surface of the humerus at the base of the teres process and from the fascial sheet covering M. teres major near its insertion, and a deep layer from the posterior surface of the humerus as far distally as the olecranon fossa.

INSERTION: The superficial layer on the palmar edge of the posterior crest of the olecranon process of the ulna, and the deep por­

tion in a fossa at the base of the proximal crest of the olecranon.

REMARKS: This muscle has the same general form in Condylura , Desmana , Galemys , Neurotrichus , Parascalops , Scalopus , Scapanus , Scaptonyx , Talpa , and Urotrichus . In Condylura , Desmana , Galemys , Neurotrichus , Scaptonyx , and Urotrichus , there are few if any fibers of the superficial layer originating from M. teres major . In Uropsilus , this muscle originates from the medial surface of the humerus and from the base of the teres process, and inserts on the proximal crest of the olecranon.

M. triceps brachii , caput longus ( figs. 9– 11 )

ORIGIN: From the proximal two­thirds of the spine separating the infraspinous fossa from the teres major fossa.

INSERTION: On the proximal crest of the olecranon process of the ulna.

REMARKS: This muscle has the same general form in the 11 study taxa. It is best developed in Parascalops , Scalopus , Scapanus , and Talpa .

Figures

Fig. 10. Ventral view of pectoral limb muscles of Parascalops.

Fig. 12. Ventral view of forearm muscles of Parascalops.

Fig. 9. Dorsal view of pectoral limb muscles of Parascalops.

Fig. 11. Dorsal view of forearm muscles of Parascalops. A, Superficial muscles; B, deeper muscles.