. Human physiology. Fig. 26.—The Bight Scapula frombehind. 1, edge of the glenoid cavity; 2, theblade ; 3, the spine ; 4, the process whicharticulates with the outer extremity 0/the clavicle. 1 Fig. of the Upper Limb. Fig Shoulder-Girdle and Head of the 1, clavicle; 1, scapula; 3, hu- Humerus. merus; 4, ulna; 5, radius; ... , , 6, carpal bones ; 7, meta- 1, clavicle ; 2, process of the scapula ; -3, blade ; 4, glenoidcarpal bones ; 8, phalanges. cavity ; s, head of the humerus. THE SKELETON 27 fits into the glenoid cavity of the scapula. The joint thus formedpermits of a gr
. Human physiology. Fig. 26.—The Bight Scapula frombehind. 1, edge of the glenoid cavity; 2, theblade ; 3, the spine ; 4, the process whicharticulates with the outer extremity 0/the clavicle. 1 Fig. of the Upper Limb. Fig Shoulder-Girdle and Head of the 1, clavicle; 1, scapula; 3, hu- Humerus. merus; 4, ulna; 5, radius; ... , , 6, carpal bones ; 7, meta- 1, clavicle ; 2, process of the scapula ; -3, blade ; 4, glenoidcarpal bones ; 8, phalanges. cavity ; s, head of the humerus. THE SKELETON 27 fits into the glenoid cavity of the scapula. The joint thus formedpermits of a greater freedom of movement than any other joint inthe body. This is due to the fact that the head of the humerusis much larger than the shallow cavity which receives it. On thisaccount, too, the shoulder-joint would be very easily dislocated,were it not that the two processes of the scapula bend over the. Fig. 28.^The Bones of the Bight Pore-arm in 29.—In Pronation. i, humerus ; 2, ulna; 3, radius; 4, carpal bones ;5, metacarpal bones ; 6, phalanges. Fig. Bonesof the Fore-arm,with the OrbicularLigament. i, ulna ; 2, radius ; 3, ole-cranon process; 4, orbi-cular ligament. head of the humerus and prevent its getting out of joint when toogreat pressure is brought to bear on it. In the forearm there are two bones—the ulna and the ulna (Lat. the elbow) is thick at its upper extremity, whichforms a hinge joint (a joint which allows of motion in one planeonly, like the hinge of a door) with the lower head of the extremity of the ulna also sends a projection behind the 28 ELEMENTARY PHYSIOLOGY humerus, forming the olecranon process (Gr. olene, the elbow; andkranion, the top) or prominence of the elbow, which gives attach-ment to certain muscles, and prevents the forearm from movingtoo far back. The radius is slender at the top, where its sh
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