The serratus anterior muscle (Latin: serratus magnus; French: muscle dentelé antérieur) - named from its serrated or saw-like anterior border and large size - is an irregular quadrilateral sheet curved to the shape of the side of the thorax. Its anterior attached border has a somewhat sinuous curve and arises from the side of the thorax by nine or ten digitations or teeth, which, by their saw-like appearance, give the muscle its name. The muscle may be divided into an upper, middle, and lower part.
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The subclavius muscle (french: Muscle subclavier) - named from its position beneath the clavicle (=clavis) - is almost cylindrical, but may be more accurately described as a thick sheet of the shape of a low obtuse-angled triangle, the obtuse angle being contained between the clavicular attachment and the inner free border of the muscle.
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The inner or prevertebral group consists of the greater and lesser rectus capitis anticus and the longus colli.
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The outer group is formed by the three scaleni, which pass from the first two s upwards and inwards to the transverse processes.
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This group comprises only the buccinator muscle.
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