AND FAMILY DISPENSATORY, «53 
The arm is varioufly moved, therefore has it many mufcles, to wit, nine in num- 
ber. 1. Peéforalis is great and fiefhy, arifing from the whole breaft-bone, and griftle 
thereof, the fernum, and above half the clavicula, and is by a fharp tendon inferted 
into the fhoulder-bone, between the deltoides and the biceps, ..2. Deltoides, from 
likenefs to the letter 4, fprings from the middle of the clavicula, and the acromium, 
and is inferted into the middle of the arm or thoulder-bone. 3. Latiffiimus, {prings 
from the veriebre of the loins, and of nine vertebra of the back, and is inferted 
into apart of thearm, between the petoral and round mu(cle, with a ftrong, 
fhort, and broad, tendon: this with its fellow of the other arm covers almoft the 
whole back: it is called ani /calptor, becaufe it draws the arm backwards and down- 
wards. 4. Rotundus major is flethy, thicker, and rounder, than the reft, obliquely 
feated behind under the axilla, and arifes from the lower rib of the /capula, which, 
afcending a little with its tendon, fhort, broad, and ftrong, is inferted (with the 
pectoral mufcle) into the middle of the arm. 5. Rotundus minor, is thort, round, 
quite fiefhy, and arifes with a fharp beginning out of the lower corner of the /capula, 
terminating with an acute end in that ligament, with which the head of the fhoulder 
is involved. 6. Infra fpinatus, arifes in the middle between the {maller round mufcle 
and the fpina, covers the whole external bunching part of the feapula, then, becom~- 
ing more narrow, it is inferted into the neck of the arm, or thoulder. 7. Supra- 
foinatus, is flefhy, and arifes out of the fpine of the upper rib of the /capula, then, 
being conveyed under the acromium, it is inferted with a broad and ftrong tendon 
into the neck of the arm, at the ligament of the joint. 8. Subfcapularis, or immerfus, 
is very flefhy, and paffes between the /capula and ribs, poffefling the hollow and 
inward part of the fhoulder-blade, then is carried out, and inferted, with a broad 
tendon, internally into the fecond ligament of the humerus. Coracoides, is inferted 
into the inner part of the fhoulder, about the middle of the arm, by the tendon of 
‘the deltoides. Its beginning is nervous and fhort: and its belly has an hole in 
it (whence its name) to give a ate tee nerven ream ap Pr mois of the 
cubit. | 
- The cubit or elbow has two sete: the ulna and radius : the ulna ferves for flexion 
and extenfion; but the radius for pronation and fupination, The ulna is bended 
by two mutcles, the diceps and brachieus internus, and extended by four, viz. longus, 
brevis, cubitalis, and brachieus externus, 1. Biteps, arifes from the /capula, round and 
tendinous, which is inferted into the inner part of the radius, 2. Brachieus intermus 
is placed beneath the diceps, {maller than the former, and arifing from the middi 
of the as brachii, and is inferted before into the common beginning of the radius ani 
ulna. 3. Longus, or extenders primus, arifes from the lower rib of the thoulder- blade, 
3 BO. i a Dear 
