. Human physiology. rrel, and other climbinganimals. The scapula or shoulder-blade is triangular in form ; it con-sists of a broad flat portion, and a prominent ridge or spine at theback of this. The front surface is smooth and concave, and glidesover the back convex surface of the chest. The outer end of theclavicle articulates with one of the two processes which projectfrom the top of the scapula, and is attached to the other processby means of strong ligaments. At the upper and inner part of thescapula there is a shallow concave surface—the glenoid cavity(Gr. glene, the pupil; and eidos, fo
. Human physiology. rrel, and other climbinganimals. The scapula or shoulder-blade is triangular in form ; it con-sists of a broad flat portion, and a prominent ridge or spine at theback of this. The front surface is smooth and concave, and glidesover the back convex surface of the chest. The outer end of theclavicle articulates with one of the two processes which projectfrom the top of the scapula, and is attached to the other processby means of strong ligaments. At the upper and inner part of thescapula there is a shallow concave surface—the glenoid cavity(Gr. glene, the pupil; and eidos, form)—which receives the roundedhead of the bone of the upper arm. It will thus be seen that thescapula is united to other bones only at or near the has, therefore, great freedom of motion. The humerus or bone of the upper arm is very strong. Itconsists of a long portion called the shaft, and two enlarged ex-tremities called the heads. As already mentioned, the upper head 26 ELEMENTARY PHYSIOLOGY.
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