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Laboratory 4. Pectoral Region
Step 10. Serratus Anterior Muscle and Long Thoracic Nerve

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Identify the serratus anterior muscle [indicated by the lower probe]. It arises from the outer surface of the upper eight ribs and attaches on the anterior surface of the scapula near its vertebral margin. It is innervated by the long thoracic nerve ( see Laboratory Five).

Links and References:
Grant's: 6.22 and 6.25
Netter (1ed.): 175 402, 403, and 404 (2ed.): 175 398, 399, and 400
Rohen and Yokochi: 385 and 387-389