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PART I: ANTERIOR MUSCLES (Figure 10.16)
These eight muscles of the…
PART I: ANTERIOR MUSCLES (Figure 10.16)
These eight muscles of the anterior fascial compartment are listed from the lateral to the medial aspect. Most arise from a common flexor tendon attached to the medial epicondyle of the humerus and have additional origins as well. Most of their tendons of insertion are held in place at the wrist by a thickening of deep fascia called the flexor retinaculum.
( SUPERFICIAL MUSCLES)
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0—medial epicondyle of humerus; olecranon and posterior surface of ulna 1—pisiform and hamate bones and base of fifth metacarpal
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Powerful flexor and adductor of hand in synergy with exte nsor muscl carpi ulnaris (posterior e); stabilizes wrist during finger extension
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DESCRIPTION
Small fleshy muscle with a long insertion tendon; often absent; may be used as guide to find median nerve that lies lateral to it at wrist
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Tenses skin and fascia of palm during hand movements; weak hand flexor; weak synergist for forearm flexion
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NERVE SUPPLY
Median nerve (C7, C8, and T1)
DESCRIPTION
Two-headed muscle; more deeply placed (therefore, actually forms an intermediate layer); overlain by muscles above but visible at distal end of forearm
ACTION
Flexes hand and middle phalanges of second to fifth fingers; the important finger flexor for speed and flexion against resistance
MUSCLE
flexor digitorum superfkialis um socisper-fish"e-a I is) digit = finger, toe; superficial = close to surface)
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