MYOLOGY - - 153 



The muscles which we find there are, consequently, more 

 or less numerous. In the dog and cat they are : a portion 

 of a muscle v/hich we do not normally meet with in man — 

 the omo-trachelian — then in a decreasing extent : supra- 

 spinatus, levator anguli scapulae and splenius. 



In the pig : the omo-trachelian, supraspinatus, and the 

 terminal portion of the sterno-prescapular — the anterior 

 part of the lesser or deep pectoral muscle. 



In the ox : the omo-trachelian only. 



But in the' horse we find the omo-trachelian, the supra- 

 spinatus, and the terminal extremity of the sterno-pre- 

 scapular ; then in a larger extent of area the levator anguli 

 scapulae and the splenius ; and, finally, the anterior portion 

 of the rhomboid. 



Among the muscles which we have just enumerated are 

 some that we have already studied ; these are the sterno- 

 prescapular and the rhomboid. We will examine the supra- 

 spinatus muscle in connection with the region of the shoulder. 



As to the scaleni muscles and the complexus, they are 

 deeply situated, whereas the omo-hyoid is visible in the 

 anterior region of the neck only. 



There remain for us, accordingly, to examine, at the 

 present juncture, but the omo-trachelian, levator anguli 

 scapulae, and splenius muscles. 



The Omo-trachelian Muscle (Fig. 68, 13 ; Fig. 69, 17 ; 

 Fig. 70, 20). — Also called the acromio-trachelian, levator 

 ventri scapulce,'^ the angnlo-verdral muscle, and the tvansvevso- 

 scapular,f etc., this muscle is described by some liippoto- 

 mists as belonging to the mastoido-himieral, of which it then 

 forms its posterior or deep portion (see p. 153). 

 , The omo-trachelian muscle is found in all mammalia, 



. . -l • • : 



f— 



. * Ventri, because inserted into the inferior part of the spine of the 

 scapula, towards the acromion — that is, on the ventral side — by contrast 

 with the trapezius, which is attached higher up (dorsal side) on the same 

 process. 



t Among the many names given to this muscle, Arloing and Lesbre 

 recommend the adoption of the name ' transverse scapular ' given by 

 Straus-Durckheim, or ' transyerse of the shoulder ' (Arloing and Lesbre, 

 ' Suggestions for the Reform of Veterinarian Muscular Nomenclature,' 

 Lyons, 1898). 



