ANATOMY. | 33 
Internal arm—Arises from the arm bone on each side of the ten- 
don of the triangle ; inserted into the crow-process of the fore-arm : 
use, to assist in bending the fore-arm. 
The Three-headed Extender of the Fore-arm—Arises from the 
neck of the shoulder-blade, and neck and middle of the arm bone; 
inserted into the upper and outer part of the elbow joint; use, to 
_ extend the fore-arm. ; 
Elbow Muscle—Arises from the outer eminence of the arm bone ; 
inserted into the back part, or ridge of the fore-arm; use, to as 
in extending the fore-arm. 
MUSCLES SITUATED ON THE FORE-ARM. 
Long Back Muscle of the Outer-arm—Arises from the outer joint- 
process of the arm bone ; inserted into the outer-arm, near the pen- 
cil-process ; use, to assist in turning up the palm of the hand. 
Longer Extender of the Wrist—Arises the sameas before ; inserted 
into the hand bone of the fore finger ; use, to extend the wrist. 
Shorter Extender of the Wrist—Arises the same as before; inserted 
into the hand bone of the middle finger ; use, to assist the former. - 
Common Extender of the Wrist—Arises the same as before ; insert- 
ed into the back of the bones of the fingers; use, to extend the fin 
Extender of the Little Fingers—Arise the same as before ; inserted 
into the second joint of the little finger; use, to assist in extending 
the fingers. 
Fate abi Extender of the Wrist—Arises the same as before; in- 
“serted into the hand bone of the little finger; use, to assist in ex- 
tending the wrist. - at x 
Fore-arin Bender of the Wrist—Arises from the inner eminence _ 
of the arm bone, and head of the fore-arm ; ‘inserted into the fourth 
bone of the first row of the wrist; use, to assist in bending the hand. 
Long Palm—Arises from the inner eminence of the arm bone 
inserted into the ligament of the wrist, and thence forms the expan- 
sion of the hand ; use, to bend the hand. 
Bender of the Wrist—Arises the same as before ; inserted 
. hand bone of the fore finger ; use, to bend the hand. oe 
Long Roller of the Outer-arm—Arises from the inner ‘emi 
the arm bone, and crow-process of the fore-arm ; ‘inset 
outer ridge of the outer-arm bone, along the middle of ‘its | 
use, to roll the hand inwards. ; ee 
Short Back of the Outer-arm—Arises from the outer eminence of _ 
- the arm, and edge of the fore-arm; inserted into the front, inner, 
and part of the outer-arm ; use, to roll the outer-arm outward, and 
assist the elbow. BBE oe; 
Extender of the Hand Bone of the Thumb= Ai 
of the fore-arm, bony ligament, and outer-arn = 
sided bone_and the first bone of the thumb; use, to stretch the 
tone of the thumb outward. io a 
_ Extender of the First Joint-—Arises near the middle of the fi 
bony ligament, and outer-arm; inserted into the convex p: 
second bone of the thumb; use, to extend the second 
