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The Coracobrachialis
Figure 10.22 Pectoral and Brachial Muscles. (a) Anterior view. (b) Posterior view. (c) The biceps brachii, the superficial flexor of the elbow. (d) The brachialis, the deep flexor of the elbow, and the coracobrachialis and subscapularis, which act on the humerus.

Saladin: Anatomy & Physiology: The Unity of Form and Function, Third Edition

360 Part Two Support and Movement

Labeled Cadaver Muscles
Figure 10.23 Muscles of the Chest and Brachial Region of the Cadaver. (a) Anterior view; (b) posterior view. What muscles in these two figures would you remove to see more of the rotator cuff (SITS) muscles?

Saladin: Anatomy & I 10. The Muscular System I Text I © The McGraw-Hill

Physiology: The Unity of Companies, 2003 Form and Function, Third Edition

Chapter 10 The Muscular System 361

Table 10.11 Actions of the Shoulder (Humeroscapular) Joint

-Clavicle

Acromion

Infraspinatus—

Teres minor

Humerus -

process

SubscapuIaris

Figure 10.24 The Rotator Cuff. Anterolateral view of the right shoulder. The rotator cuff muscles are labeled in boldface.

Supraspinatus

Coracoid process

SubscapuIaris

Boldface indicates prime movers; others are synergists. Parentheses indicate only a slight effect.

Flexion Extension

Anterior deltoid

Posterior deltoid

Pectoralis major

Latissimus dorsi

Coracobrachialis

Teres major

Biceps brachii

Abduction

Adduction

Lateral deltoid

Pectoralis major

Supraspinatus

Latissimus dorsi

Coracobrachialis

Triceps brachii

Teres major

(Teres minor)

Medial Rotation

Lateral Rotation

Subscapularis

Infraspinatus

Teres major

Teres minor

Latissimus dorsi

Deltoid

Deltoid

Pectoralis major

Figure 10.24 The Rotator Cuff. Anterolateral view of the right shoulder. The rotator cuff muscles are labeled in boldface.

Table 10.12 Actions of the Forearm

The anconeus46 is a weaker synergist of extension that crosses the posterior side of the elbow (see fig. 10.28d, e).

Pronation is achieved by two anterior muscles in the forearm—the pronator teres near the elbow and pronator quadratus near the wrist. Supination is achieved by the biceps brachii and the supinator of the posterior forearm (fig. 10.25).

Boldface indicates prime movers; others are synergists. Parentheses indicate only a slight effect.

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