A complete handbook for the sanitary troops of the U S army and navy . with a double curve like the Italic letter «$?. It is connected atone end with the breast bone and at the other with a process of theshoulder blade known as the acromion; it is the acromion processwhich we feel just under the skin at the point of the shoulder. Theclavicle notwithstanding its strengthis very frequently broken owing toits fixed position and the fact thatit receives the jars transmittedthrough the upper extremity whenone tries to save himself in fallingby throwing out the arm. Thescapula (Fig. ii) is a freely
A complete handbook for the sanitary troops of the U S army and navy . with a double curve like the Italic letter «$?. It is connected atone end with the breast bone and at the other with a process of theshoulder blade known as the acromion; it is the acromion processwhich we feel just under the skin at the point of the shoulder. Theclavicle notwithstanding its strengthis very frequently broken owing toits fixed position and the fact thatit receives the jars transmittedthrough the upper extremity whenone tries to save himself in fallingby throwing out the arm. Thescapula (Fig. ii) is a freely mov-able flat bone connected at one endwith the collar bone to form thearch of the shoulder; its outerangle or head contains a shallow,saucer-shaped depression known asthe glenoid cavity for the receptionof the head of the humerus to formthe shoulder joint. The shoulder,like the hip, is a ball-and-socketjoint, but unlike the hip, the socketis very shallow, so that the head of the humerus in the very freemotion permitted easily rolls over the edge and becames dis-. FiG. ir.— Scapula. 44 ANATOMY AND PHYSIOLOGY located; as a matter of fact dislocation at the shoulder joint ismany times more frequent than at all the other joints of the bodyput together, so that in obscure injuries to the shoulder we alwayslook for dislocation. The arm is that portion of the upper extremity which lies betweenthe shoulder and elbow; like the thigh it contains but one bone, thehumerus (Fig. 12). The upper end of the humerusconsists of the head and the tuberosities, the anatomicalneck lying between the two, and the surgical neckbeing the constricted portion of the shaft just belowthe tuberosities; the surgical neck is so called becauseit is the part most frequently broken. The lower end of the humerus is expanded to formthe elbow joint and has a projection on each sideknown as a condyle. The elbow joint is made up of the humerus and thetwo bones of the forearm, the radiusand idna (Fig. 13). The radi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfirstaidinillnessand
