Page 71 - Alaska A & P Primer

11.5 Muscles of the Pectoral Girdle and Upper Limbs
11.5 OBJECTIVES
1. Identify the muscles of the pectoral girdle and upper limbs
The external intercostals are located laterally on the sides of the body. The internal inter- costals are located medially near the sternum. The innermost intercostals are located deep to both the internal and external intercostals.
The pelvic floor is a muscular sheet that defines the inferior portion of the pelvic cavity.
The pelvic diaphragm, spanning anteriorly to posteriorly from the pubis to the coccyx, com- prises the levator ani and the ischiococcygeus. Its openings include the anal canal and ure- thra, and the vagina in women.
(a, c) The muscles that move the humerus anteriorly are generally located on the anterior side of the body and originate from the sternum (e.g., pectoralis major) or the anterior side of the scapula (e.g., subscapularis). (b) The muscles that move the humerus superiorly gen- erally originate from the superior surfaces of the scapula and/or the clavicle (e.g., del- toids). The muscles that move the humerus inferiorly generally originate from middle or lower back (e.g., latissiumus dorsi). (d) The muscles that move the humerus posteriorly aregenerally located on the posterior side of the body and insert into the scapula (e.g., in- fraspinatus).
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State of Alaska EMS Education Primer - 2016
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