CHAPTER IX 



MUSCLES OF RIGHT SIDE OF TRUNK AND HEAD; 



SALIVARY, THYROID, AND LYMPH GLANDS 



AND VESSELS OF THE HEAD AND NECK 



A. EXTERNAL MUSCLES OF THE TRUNK 



(Nos. 51-62) 



Those muscles which He outside of the body cavity may be 

 considered in two groups according to generaUzed functions: (i) 

 Respiratory muscles and (2) Supporting muscles. Most of 

 these are both supporting and respiratory, such as, those in the 

 abdominal wall, but certain others are primarily respiratory in 

 function, such as, the intercostals (56, 57) and serratus posticus 

 (55) groups, while others are primarily supporting in functions, 

 such as, the muscles of the back. The student should consider 

 the possible as well as the obvious functions of each muscle and 

 of each group of muscles while he is doing the dissection. 



The musculature of the abdominal wall is comprised of 

 muscles 51-54. Method: See that the cutaneous maximus 

 muscle and all superficial fascia have been removed so that the 

 fibers of the muscles are clearly visible. Because the abdominal 

 wall is very thin in the rabbit, it is scarcely worth while for the 

 student to do more dissection than is necessary to clearly 

 identify the first three muscles (51-53). The student must 

 remember that only muscles of the right side of the rabbit will 

 be dissected, as directed in this chapter. However, it is permis- 

 sible to dissect the sternothyroid (61) and sternohyoid (62) 

 muscles on the left side since these will have to be transected in 

 dissecting the vessels of the neck. Do not open the abdominal 

 cavity until directed to do so (Chap. X). 



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