Anatomy
The serratus posticus superior muscle (lat: Serratus posticus superior) - named from its saw-like edge and its relation to the other serrati - is a quadrilateral sheet with a toothed outer margin.
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The sterno-cleido-mastoid (French: muscle sterno-cléido-mastoïdien), or sterno-mastoid muscle, named from its attachments, is a strong ribbon-shaped and, bifurcated below, and somewhat constricted in its middle third.
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The pectoralis major (french : muscle grand pectoral) named from its being the larger of the two muscles which arise from the front of the chest (pectus = breast) - is a thick, triangular, fan-shaped sheet ; or, more accurately, it may be likened to the sector of a circle on account of le curved origin, from which all the fibres converge to the upper part of the humerus as a center.
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These consist of four muscles arranged in three layers : the first containing the digastric and stylo-hyoid, the second the mylo-hyoid, and the third the genio-hyoid.
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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 infra-hyoid muscles form a group of four long flat muscles, arranged in two layers, and enveloped by the deep layer of the cervical fascia.
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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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This group comprises only the buccinator 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 angular series are four in number: viz. the zygomaticus major, levator anguli oris, risorius and depressor anguli oris. Two descend to the corner of the mouth obliquely from above, one runs almost horizontally forwards, and one ascends from below. They blend at the corner of the mouth, and form there a thick, muscular mass, behind which is a depression filled up with the fat covering the buccinator. In a lean face this depression is often very conspicuous, and in some faces its position is indicated by a dimple when the zygomaticus major contracts.
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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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The orbicularis oris - an unpaired muscle, named from its shape and situation - is an oval sheet with the long axis placed transversely, and its fibres arranged round a transverse central aperture. Like the orbicularis oculi, the muscle may be divided into an internal or labial portion, and an external or facial. The first part, which is superficial, has no bony connection, except through the medium of the adjacent muscles with which it is closely blended. The second, which is deep and |which forms part of the third layer of the facial muscles, has the following small Ibony attachments.
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The spleen is a large blood-vascular