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serratus anterior (costoscapularis, serratus magnus)
Origin: center of lateral aspect of 1st 8-9 ribs
Insertion:
-> superior & inferior angles & intervening medial border of scapula
Action:
1) rotates scapula & pulls it forward
2) elevates ribs
Innervation: long thoracic nerve from brachial plexus
General
skeletal muscle (voluntary muscle)
References
Stedman's Medical Dictionary 26th ed, Williams &
Wilkins, Baltimore, 1995
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