MUSCLES OF THE RIGHT SUPERIOR LI]VIB 5 1 



Sd. Pectoscapularis m.: Manubrium and first three sterne- 

 brae; to entire length of spine of scapula and craniomedial 

 surface of vertebral border of scapula. Rotates scapula 

 craniad. It is firmly, although indirectly, attached to the 

 clavicle by tendonous fibers. (Cf. method, m. 14.) 



9. Rhomboideus m.: Spinous processes of vertebrae from 

 second cervical to ninth thoracic; to vertebral border of scapula. 

 Draws vertebral end of scapula toward spinal column. This 

 muscle has an anterior (rhomboideus minor) and a posterior 

 part (rhomboideus major) as in man. Transect both parts. 



10. Serratus magnus (s. ventralis, s. anterior) m.: Sternal 

 ends of second to seventh or eighth ribs, by six, (sometimes 

 seven) fleshy digitations; to inferior angle of scapula, with 

 rhomboideus major m. (9). Draws vertebral end of scapula 

 ventrad and, with levator scapulae (11), forms a sort of sHng 

 which supports most of the weight of the anterior part of the 

 body on the superior limbs. Transect. 



11. Levator scapulae (levator anguli scapulae of man) m.: 

 Transverse processes of last five cervical vertebrae and first two 

 ribs, under scalenus muscle; to vertebral border of scapula. 

 Draws scapula cranioventrad and, with serratus magnus 

 (10), supports much of the weight of the body. Transect. 



Method of removing superior Hmb: The attachments of the 

 clavicle to the sternum should be severed so that the clavicle is 

 permanently attached by ligaments to the muscles of the 

 shoulder joint. Failure to provide this attachment for the 

 clavicle will result in loss of parts of four muscles (Nos. 4, 5, Sc, 

 and 12) and of the clavicle itself, unless it has been left attached 

 to the sternum. The student must remember that the right 

 superior is the only limb which will be removed from his rabbit 

 and that this limb must be preserved until the end of the 

 term. 



A check at this time should show that every muscle which 

 helps to attach the superior limb to the body has been transected 

 so that this limb is free from the trunk. It is a good plan to 

 place the limb in its normal position and identify the proximal 



