The wrist-joint (Class. - Diarthrosis. Subdivision. - Condylarthrosis.) is formed by the union of the radius and articular disc above, articulating -with the navicular, lunate, and triquetral bones below; the ulna being excluded by the intervention of the articular disc. The radius and disc together present a smooth surface, slightly concave both from before backward, and from side to side, whilst the three bones of the carpus present a smooth, convex surface, made uniformly even by the interosseous ligaments which bind them together.
The oral cavity is the first portion of the entire digestive tract. It is an irregularly shaped, elongated cavity, situated in the lower portion of the face, and its boundaries are partly bony and partly musculocutaneous. It is divided by the two rows of teeth into two incompletely separated spaces, the vestibulum oris and the oral cavity proper.
This scapula (French : scapula, omoplate), is placed upon the upper and back part of the the thorax, occupies the space from the second to the seventh rib, and forms the posterior part of the shoulder. Its form is irregularly triangular and flat. It presents for examination two surfaces, three borders, and three angles.
The elbow-joint [articulatio cubiti] Class. - Diarthrosis. Subdivision. - Ginglymus.is a complete hinge, and, unlike the knee, depends for its security and strength upon the configuration of its bones rather than on the number, strength, or arrangement of its ligaments.
The stomach [Latin: ventriculus ; gaster; French: estomac] is a dilation of the alimentary canal succeeding the esophagus. In the stomach the food is mixed with the gastric juice and reduced to a viscid, pulpy liquid, the chyme [chymus], which undergoes a certain amount of digestion and absorption before passing into the duodenum.
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.
The shoulder articulation [articulatio humeri] is one of the most perfect and most movable of joints, the large upper end of the humerus playing upon the shallow glenoid cavity. Like the hip, it is a ball-and-socket joint. It is retained in position much less by ligaments than by muscles, and, owing to the looseness of its capsule, as well as to all the other conditions of its construction and position, it is exceedingly liable to be displaced; on the other hand, it is sheltered from violence by the two projecting processes - the acromion and coracoid. The ligaments of the shoulder-joint are:
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