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ANATOMY?) ‘* 
| THE POINT BONE. el 
This small bone forms the tip, or lower end of the sacred bone. 
_Its use is to sustain the rectum, or straight gut, and prevent rupture 
of the soft parts in delivery. 
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__ Sustains the arm, and forms the joint of the arm bot 2 Fs 
and the pulley of the arm bone. © 
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OF THE UPPER EXTREMITIES. 
The bones of the upper extremities, are, on each side, the collar 
bone, the shoulder-blade, the upper-arm, the two for “bones, 
bones of the wrist, hand, and fingers. ‘ ore 7 ius 
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This bone is placed slanting on the upper and side parts of the oe 
chest. Its shape is similar to the letter {. There is a groove on its 
under side, for the reception of the under collar bone arteries. Its 
use is, to connect the shoulder-blade and upper-arm bone to the 
chest, and to defend the collar.bone vessels. In front it is jointed 
to the breast bone, and behind to the shoulder-blade, by its head fit- 
ting in a cavity. at : eer 
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SHOULDER-BLADE. 
This is placed in the upper and side parts of the back ; its shape 
triangular. Its eminences are, the spine, which is in the middle of 
the outer surface; its front termination is called its extremity ; the 
crow’s bill process, which stands out opposite to the extremity ; the 
borders of the bone are called ribs, and the corners, angles ; the cir- 
cle below the joint cavity is called the neck. Its €avity is, the joint - 
Cavity which receives the head of the arm bone. The shoulder- 
‘is connected with the ribs, and bone of the tongue, by muscles, 
and with the arm bone, by ball and socket. Tt defends the back, 
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UPPER ARM-BONE, 
As situated between the shoulder-blade and fore-arm. Eminences: 
the head which is rounded on its upper part ; the neck whichis im+ 
mediately below the head ; the great eminence near the neck, which 
receives the upper spine muscles; and the lesser eminence, which 
has affixed to it the under muscle of the shotilder-blade. On the 
lower end are three eminences, namely, an outer and an inner, 
which give origin to the i extending muscles of the arm, 
There is a furrow between the emi- 
nences, for a long tendon: in the back part of the lower end, a de- 
pression for the process of the outer arm bone; and a frent depre: 
ston for the crow process. It constitutes the arin. 
| | THE FORE-ARM BONE. 
me is situated in the inside of tlie fo 
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