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Lies deep to the internal and external abdominal and works with them to compress the abdomen.
Superficial Erector Spinae; Illiocostalis, longissimus, and spinalis
The erector group which lies lateral and superficial to the multifidus allow for extension and posterior translation when the muscles are contracted bilaterally.
Arises from the iliac crest which extends between the transverse processes of the 5th lumbar vertebra
The anterior muscles of the shoulder joint. A prime mover inadduction, horizontal adduction, and internat rotation of the humerus.
Responsible for shoulder flexion, horizontal adduction, and internal rotation of the glenohumeral
Glenohumeral extension, horizontal abduction, and external rotation oppose those of the anterior deltoid.
The chief extensor of the elbow; in addition the long head stabilizes the shoulder joint
Contraction of one side: laterally flexes neck, rotates head to opposite side; Contraction of both sides together: flexes neck
flex neck (when 1st rib is fixed); elevate 1st and 2nd ribs during forced inhalation when neck is fixed
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