THE SCAPULA 



75 



nence, the tubercle of the s]Mnc (Tuber spina^, to which the trapezius muscle 

 is attached. The supraspinous fossa (Fossa su])raspinata) is situated in front of 

 the spine, and the infraspinous fossa (Fossa infraspinata) behind it. The former 

 is much the smaUer of the two; it is smooth and is occupied by the supraspinatus 

 muscle. The infraspinous fossa lodges the infraspinatus muscle; it is wide and 

 smooth in its upper part, narrower below, where it is marked by several rough lines 

 for the attachment of the teres minor muscle; near the neck is the nutrient foramen, 

 and a little lower is a vascular groove. 



The costal surface or venter (Facies costalis) is hollowed in its length by the 



Cervical angle 



Supraspinous fossa 



Anterior border 



Diirsdl angle 



Infraspinous fossa 

 Vascular groove 



- Posterior border 



Tubercle of spitic 



Neck 



Tuberosity 



Nutrient foramen 

 Vascular groove 



rid cavity 

 Fig. 41. — Left Scapula of Horse, External View. (After Schmaltz, Atlas d. Anat. d. Pferdes.) 



subscapular fossa( Fossa subscapularis) ; this occupies nearly the whole of the lower 

 part of the surface, but is pointed above and separates two rough triangular areas 

 (Facies serrata), to which the serratus magnus is attached. In the lower third 

 there is a vascular furrow with several branches. 



The anterior or cervical border (Margo cranialis) is convex and rough above, 

 concave and smooth l)elow. 



The posterior or dorsal border (]Margo caudalis) is slightly concave. It is 

 thick and rough in its upper tliird, thin in its middle, and thickens again below. 



The superior or vertebral border (Margo dorsalis s. basis) carries the scapular 

 cartilage (Cartilago scapulae). In the young subject the edge of the bone is thick, 



