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.
Each palate bone, (os palati,) wedged in between the superior maxillary and sphenoid bones, is common to the cavity of the mouth, nares, and orbit. In its form, this bone somewhat resembles that of the letter l, one part being horizontal, the other vertical.
The peritoneum, as has been shown, is a serous membrane which lines the cavity of the abdomen from the diaphragm to the pelvic floor, and invests or covers to a varying extent the viscera which that cavity contains. Viewed in its very simplest condition, it may be regarded as a closed sac, the inner surface of which is smooth, while the outer surface is rough and is attached to the tissues which surround it.
The humerus or arm-bone (french : humérus), the largest bone of the upper extremity, extends from the scapula to the bones of the fore-arm, with each of which it is articulated. Its direction is vertical, with an inclination inwards towards the lower end. Long and irregularly cylindrical in form, the humerus is divisible into a body and two extremities.
The deltoid muscle (French: muscle Deltoïde; latin : deltoideus) is fleshy from the lateral border and upper surface of the acromion and from the ventral border and upper surface of the lateral third of the clavicle, and tendinous from the spine of the scapula. Some fibre-bundles also at times arise from the deep fascia of the muscle where it overlies and is fused to the fascia of the infraspinatus muscle near the spine.
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