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PART II: POSTERIOR MUSCLES (Figure 10.17)
These muscles of the posterior…
PART II: POSTERIOR MUSCLES (Figure 10.17)
These muscles of the posterior fascia' compartment are listed from the lateral to the medial aspect. They are inserts solely into radius all innervated by the radial nerve or its branches. More than half of the posterior compartment muscles arise from a common extensor origin tendon attached to the posterior surface of the lateral epicondyle of the humerus and adjacent fascia. The extensor tendons are held in place at the posterior aspect of the hand by the extensor retinaculum, which prevents "bowstringing" of these tendons when the wrist hyperextended. The extensor muscles of the fingers end in a broad hood over the dorsal side of the digits, the extensor expansion.
( SEPERFICIAL MUSCLES )
ACTION
Extends hand in conjunction with extensor carpi radialis and adducts hand in conjunction with flexor carpi ulnaris
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DESCRIPTION
Most medial of superficial posterior muscles; long, slender muscle
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MUSCLE
Brachioradialis
Extensor carpi radialis longus (ek-sten'sor) (extend = increase angle between two bones)
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DESCRIPTION
Lies medial to extensor carpi radialis brevis; a detached portion of this muscle, called extensor digiti minimi, extends little finger
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NERVE SUPPLY
Posterior interosseous nerve, a branch of radial nerve (C7 and C8)
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ACTION
Extends and abducts hand; acts synergistically with extensor carpi radialis longus to steady wrist during finger flexion
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DESCRIPTION
Parallels brachioradialis on lateral forearm, and may blend with it
ACTION
See Table 10.10 Extends hand in conjunction with extensor carpi ulnaris and abducts hand in conjunction with flexor carpi radialis
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