THE ALIMENTAEY CANAL. 



299 



ments of the body are brouglit about. Into the grouping of 

 these muscles we have not space to enter here. 



In a transverse section of the horse two cavities will be seen 

 — the dorsal tube with the spine, and the large ventral ab- 

 dominal cavity. In a longitudinal section three cavities will be 

 exposed — the long neural tube, and the body divided also into 

 two by a membranous partition, the diaphragm (fig. 157, Di), 

 the front division being the thorax, the posterior the abdomen. 



The digestive tube or alimentary canal (figs. 156 and 157) may 

 be said to commence at the back of the mouth in a large space, 



Fio. 167.— Diagram op Alimentary Canal. 



Sp, Soft palate ; P, pharynx ; G, glottis ; OB, oesopliagns ; 

 SI, salivary-glanda ; T, trachea ; Im, lungs ; H, heart ; PI, 

 pleura ; Pt, pericardium ; Di, diaphragm ; St, stomach ; Py, 

 pylorus; L, liver; M, bile-duct; Pa, pancreas; Pd, pan- 

 creatic duct ; St, rectum ; A, anus ; B, duodenum ; Je, jeju- 

 num ; n, ileum ; CAE, cjecum ; Col and Co", colon. 



the pharynx (P), which is situated behind that part of the roof 

 of the mouth known as the soft palate {Sp). From the pharynx 

 a small opening leads into the gullet or oesophagus (OE and a), 

 which passes through the neck in close relation to the windpipe 

 or trachea {T), and enters the thorax in its upper moiety, runs 

 through it, and perforates the diaphragm dorsally. The stomach 

 (St and 6) receives the cesophagns at its inner margin or 

 greater curvature towards one end. The stomach of the horse 

 is a simple sac elongated transversely, and lies across the ah- 



