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Muscular System Part C Prepared by Alexander Cheroske and W. Rose.
HESC310 11/16/2018 Muscular System Part C Prepared by Alexander Cheroske and W. Rose. Figures from Martini et al., Visual A&P. Muscles with light gray labels will not be on test. Portions copyright Pearson Education Axial Skeleton
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Muscles that position pectoral girdle
An anterior view of the muscles that position the pectoral girdle Muscles That Position the Pectoral Girdle Trapezius Levator scapulae Muscles That Position the Pectoral Girdle Subclavius Pectoralis minor Pectoralis minor (cut) Serratus anterior Internal intercostals Figure Muscles that position the pectoral girdle originate on the occipital bone, superior vertebrae, and ribs External intercostals T12 Figure 2
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Muscles that position pectoral girdle
A posterior view of the muscles that position the pectoral girdle Superficial Dissection Deep Dissection Muscles That Position the Pectoral Girdle Muscles That Position the Pectoral Girdle Trapezius Levator scapulae Rhomboid minor Rhomboid major Scapula Serratus anterior Figure Muscles that position the pectoral girdle originate on the occipital bone, superior vertebrae, and ribs T12 vertebra Figure 3
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Muscles that move the arm
Superficial Dissection Deep Dissection Sternum Clavicle Ribs (cut) Muscles That Move the Arm Muscles That Move the Arm Deltoid Subscapularis Pectoralis major Coracobrachialis Teres major Figure Muscles that move the arm originate on the clavicle, scapula, thoracic cage, and vertebral column An anterior view of the muscles that move the arm Vertebra T12 Figure 4
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Pectoralis major originates from the clavicle, sternum, and ribs, and the aponeurosis of the external oblique muscle. The multiple origins are distinct in this subject.
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Muscles that move the arm
Superficial Dissection Deep Dissection Vertebra T1 Muscles That Move the Arm Muscles That Move the Arm Supraspinatus Supraspinatus Deltoid Infraspinatus Latissimus dorsi Teres minor Teres major Thoracolumbar fascia A posterior view of the muscles that move the arm Figure Muscles that move the arm originate on the clavicle, scapula, thoracic cage, and vertebral column Figure 6
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Muscles that move the arm
The actions of muscles that position the arm Abduction Extension Flexion Deltoid Tendons of biceps brachii GLENOID CAVITY POSTERIOR ANTERIOR Teres minor Subscapularis Figure Muscles that move the arm originate on the clavicle, scapula, thoracic cage, and vertebral column Triceps brachii Lateral rotation Teres major Medial rotation Adduction Figure 7
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Muscle Action of the Arm: Summary
The posterior extensor and anterior flexor muscles are shown Figure 10.17a
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Muscles that move forearm and hand
A posterior view showing the superficial layer of muscles involved in extension at the elbow and wrist Elbow Extensors Triceps brachii Anconeus Wrist Extensors Extensor carpi ulnaris Olecranon of ulna Extensor carpi radialis longus Flexor carpi ulnaris Extensor carpi radialis brevis Figure Muscles that move the forearm and hand originate on the scapula, humerus, radius, or ulna Radius Ulna Extensor retinaculum Figure 9
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Muscles that move forearm and hand
An anterior view showing the superficial muscles involved in flexion at the elbow and wrist Coracoid process of scapula Humerus Elbow Extensors Elbow Flexors Triceps brachii Biceps brachii Brachialis Brachioradialis Medial epicondyle of humerus Wrist Flexors Pronators and Supinators Flexor carpi radialis Palmaris longus Pronator teres Supinator Flexor carpi ulnaris Pronator quadratus Figure Muscles that move the forearm and hand originate on the scapula, humerus, radius, or ulna Flexor retinaculum Figure 10
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Muscles that move forearm and hand
A cross section of the right wrist (palm up) showing the synovial tendon sheaths and nearby structure Median nerve Flexor retinaculum Synovial tendon sheaths Carpal tunnel Pisiform Triquetrum Carpal bones Figure Muscles that move the forearm and hand originate on the scapula, humerus, radius, or ulna Lunate Scaphold Figure 11
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Muscles that move hand and fingers
Two anterior views of the muscles that move the hand and fingers Median nerve Tendon of biceps brachii Brachial artery Supinator Cut tendons of flexor digitorum superficialis Radius Flexor carpi ulnaris (retracted) Brachioradialis (retracted) Muscles That Flex the Fingers and Thumb Flexor digitorum superficialis Flexor digitorum profundus Flexor pollicis longus LATERAL MEDIAL Figure Muscles that move the hand and fingers originate on the humerus, radius, ulna, and interosseus membrane Anterior View, Middle Layer Anterior View, Deepest Layer Figure – 2 12
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Muscles that move hand and fingers
Two posterior views of the muscles that move the hand and fingers Anconeus Anconeus Muscles That Extend the Fingers Supinator Extensor digitorum Muscles That Move the Thumb Extensor digiti minimi Abductor pollicis longus Extensor pollicis longus Abductor pollicis longus Extensor indicis Extensor pollicis brevis Extensor pollicis brevis Tendon of extensor pollicis longus Ulna Radius Tendon of extensor digiti minimi (cut) Figure Muscles that move the hand and fingers originate on the humerus, radius, ulna, and interosseus membrane Tendon of extensor digitorum (cut) MEDIAL LATERAL Posterior View, Middle Layer Posterior View, Deepest Layer Figure – 4 13
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Muscle Action of the Forearm: Summary
Posterior extensors of the wrist and fingers, and anterior flexor muscles are shown Figure 10.17b
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