THE NECTURUS 23 



chial. It parallels the procoraco-humeralis and is just 

 dorsal to it. 



Procoraco-humeralis 



As indicated by the name, this muscle extends from the 

 procoraooid to the humerus. It is parallel and just ventral 

 to the omohyoid. The cartilage of the procoracoid is seen 

 extending slightly anterior to the end of the muscle. 



SUPRACORACOID 



On the ventral side of the animal, locate the procoraco- 

 humeralis. Extending to the median line and slightly 

 covered by the large pectoralis is this spindle shaped 

 muscle, extending from the humerus to the coracoid cartil- 

 age. Loosen the pectoralis slightly so as to see its origin 

 and insertion. 



Pectoralis 



From the head of the humerus, a large fan shaped 

 muscle extends to the linea alba. The origin is continued 

 far posteriorly. Loosen the muscle and manipulate it so 

 as to see its effect on the humerus and the girdle. 



Loosen the latissimus dorsi and cucullaris y thus exposing 



the muscles of the inner face of the scapula and girdle. 



Drawing 9. Make a new copy of the drawing of the girdle and 

 place on it these muscles of the inner side. 



SERRATUS MAGNUS 



When the latissimus dorsi is removed, a thin band of 

 muscle is seen extending posteriorly and ventrally from 

 the face of the suprascapula. It is very small and quite 

 unlike the muscle of the same name in the mammals. 



Levator scapulae 



Remove the cucullaris by cutting through the middle and 

 deflecting thus exposing the levator scapulce. It is a small 



