. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. U-. Fig. 2-27. Left scapula, lateral view. 1 infraspinous fossa, 2 caudal border, 3 scapular spine, 4 acromion, 5 supragle- noid tubercle, 6 cranial border, 7 supraspinous fossa, 8 dor- sal border. Fig. 2-28. Left scapula, medial view. 1 serrated face, 2 subscapular fossa, 3 coracoid process, 4 supraglenoid tu- bercle, 5 acromion, 6 glenoid cavity, 7 neck. flat shelf of bone, crista epicondylus lateralis, which extends distally onto the lateral epicondyle. The distal extremity consists of a condyle, con- dylus humeri, which bear t
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. U-. Fig. 2-27. Left scapula, lateral view. 1 infraspinous fossa, 2 caudal border, 3 scapular spine, 4 acromion, 5 supragle- noid tubercle, 6 cranial border, 7 supraspinous fossa, 8 dor- sal border. Fig. 2-28. Left scapula, medial view. 1 serrated face, 2 subscapular fossa, 3 coracoid process, 4 supraglenoid tu- bercle, 5 acromion, 6 glenoid cavity, 7 neck. flat shelf of bone, crista epicondylus lateralis, which extends distally onto the lateral epicondyle. The distal extremity consists of a condyle, con- dylus humeri, which bear the articular surface, and two epicondyles, epicondylus lateralis and epicon- dylus medialis (Fig. 2-31). The condyle, which con- sists of a trochlea and a capitulum, articulates with the radius and ulna. There is, however, no clear distinction between the trochlea and capitulum. Proximal to the condyle the caudal surface bears an olecranon fossa, fossa olecrani, and the cranial sur- face a radial fossa, fossa radialis (Fig. 2-30). A thin plate of bone separates the radial and olecranon fossae from each other. The latter is incomplete in some animals, in which case it bears a supratro- chlear foramen, foramen supratrochleare. The me- dial epicondyle is large and projects medial to the condyle. In some animals it bears a supracondylar foramen, foramen supracondylare, for the passage of blood vessels and nerves. The radius and ulna form the bones of the an- tebrachium or forearm. They articulate at the elbow with the humerus and with each other. At the car- pus the articulate with each other and with the proximal carpal bones. Radius. The radius (Figs. 2-32 and 2-33) is shorter and smaller than the ulna. It has two ex- tremities and a shaft, with cranial, caudal, lateral and medial margins and surfaces. The proximal ex- tremity of the radius consists of a small, rounded head, caput radii, which bears an articular surface, fovea capitis radii, for the condyle of the humerus, and an
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