The muscular system (part c). In this chapter, you will learn: Muscles crossing the shoulder joint, rotator cuff anatomy and function, movement at the glenohumeral joint, muscles crossing the elbow joint, muscles of the forearm, muscles of the forearm: anterior compartment, muscles of the forearm: posterior compartment,...and other contents.
atus* Teres minor* Teres major Triceps brachii: Lateral head Long head Latissimus dorsi Humerus Olecranon process of ulna Anconeus (b) Posterior view Copyright © 2010 Pearson Education, Inc * Rotator cuff muscles Figure 10.14b Muscles Crossing the Elbow Joint PLAY A&P Flix™: Muscles of the elbow joint (c) PLAY A&P Flix™: Triceps brachii Copyright © 2010 Pearson Education, Inc Triceps brachii Lateral head Long head Medial head Humerus Extensors Flexors Brachialis Others Posterior compartment of arm (extends elbow); innervation: radial nerve Short head Biceps brachii Long head (a) (a) Muscles of the arm Anterior compartment of arm (flexes elbow); innervation: musculocutaneous nerve PLAY A&P Flix™: Movement at the elbow joint Copyright © 2010 Pearson Education, Inc Figure 10.17a Copyright © 2010 Pearson Education, Inc Table 10.12 Part Muscles of the Forearm • Actions: movements of the wrist, hand, and fingers • Most anterior muscles are flexors and insert via the flexor retinaculum • Most posterior muscles are extensors and insert via the extensor retinaculum PLAY A&P Flix™: Muscles that act on the wrist and fingers: An overview Copyright © 2010 Pearson Education, Inc Muscles of the Forearm • Some forearm muscles act to produce pronation and supination of the forearm PLAY A&P Flix™: Muscles of the forearm (a) Copyright © 2010 Pearson Education, Inc Muscles of the Forearm • Pronators: pronator teres and pronator quadratus • Supinator: a synergist with the biceps brachii PLAY A&P Flix™: Muscles of the forearm (b) PLAY A&P Flix™: Muscles of the forearm (c) PLAY A&P Flix™: Pronator teres PLAY A&P Flix™: Supinator Copyright © 2010 Pearson Education, Inc Muscles of the Forearm: Anterior Compartment • Flexors • Flexor carpi radialis • Palmaris longus • Flexor carpi ulnaris • Flexor digitorum muscles (superficialis and profundus) • Flexor pollicis longus PLAY A&P Flix™: Carpal tunnel Copyright © 2010 Pearson Education, Inc Superficial transverse ligament of palm Palmar aponeurosis Flexor retinaculum Pronator quadratus Flexor digitorum superficialis Flexor carpi ulnaris Palmaris longus Flexor carpi radialis Flexor pollicis longus Extensor carpi radialis longus Brachioradialis Pronator teres Medial epicondyle of humerus Tendon of biceps brachii Medial head of triceps brachii Biceps brachii (a) Copyright © 2010 Pearson Education, Inc Figure 10.15a Muscles of the Forearm: Anterior Compartment PLAY A&P Flix™: Anterior Muscles of the wrist and fingers (b) PLAY A&P Flix™: Flexor carpi radialis PLAY A&P Flix™: Flexor carpi ulnaris PLAY A&P Flix™: Flexor digitorum superificalis Copyright © 2010 Pearson Education, Inc ... of the Hand • Small weak muscles • Lie entirely within the palm of the hand • Control precise movements of metacarpals and fingers (e.g., threading a needle) • Abductors and adductors of the. .. Intrinsic Muscles of the Hand • Three groups • Thenar eminence (ball of the thumb) • Hypothenar eminence (ball of the little finger) • Each of the above groups has a flexor, an abductor, and an opponens... of the Forearm: Posterior Compartment PLAY A&P Flix™: Posterior Muscles of the wrist and fingers (a) Copyright © 2010 Pearson Education, Inc Movements of the Wrist and Fingers • Flexion and