t 174 1 



C it A p. XIV. 



MUSCLES OF THE SUPERIOR EXTREMITIES. 



Stafitlat Mufcles. Mufcles of the Fore-arm. Of the Hand. Of 

 the Fingers. 



THE pe&oralis major and latifiimus dorfi havfe 

 already been defcribed. 



The mufcles which are feated on the fcapula, and 

 which are inferred into the os humeri, are, 



The fuprafpinatus, which arifes, as its name ex- 

 preiTes, from that part of the fcapula which is above 

 its fpine j it pafles under the acromion, adhering to the 

 capfular ligament of the os humeri, and is inferted 

 into the large tuberofity on the head of that bone. Its 

 ufe is to raife the arm upwards, and to draw the cap- 

 fular ligament from between the bones, fo that it may 

 not be hurt by compreffion. 



The infrafpinatus, which originates from all. that 

 part of the bafe of the fcapula that is between its fpine 

 and inferior angle; and alfo from the fpine as far as 

 the cervix fcapula. Its tendon, running forwards, is 

 conne&ed with the capfular ligament, and terminates 

 in the middle and upper part of the protuberance on 

 the head of the os humeri. This mufcle rolls the 

 humerus outwards, fupports the arm when raifed, and 

 alfo afilfts in raifing it, and pulls tho ligament from be- 

 tween the bones. 



The teres minor arifes from the inferior coda of the 

 fcapula, and is inferted into the back part of the tu- 

 berofity on the head of the os humeri. Its ufe is to 

 roll the humerus outwards and draw it backwards, and 



by 



