FIFTH LECTURE. 



THE DIGESTIVE ORGANS.— PART I. 



221. As some of the organs of digestion of non-ruminants, and those 

 of ruminants, present marked differences from one another, and the 

 derangements and diseases to which they are subject are still more 

 dissimilar, I shall deal with the stomach and bowels of each 

 separately, while the accessory organs of digestion, with their diseases, 

 will be considered in Part II. 



222. With reference to the Horse, the digestive organs consist of — 



ist. — The Mouth. — This comprises the lips; the cheeks; the hard 

 palate, or roof, (Plate XVII., No. 1 ) which is in the form of 

 ridges, or bars, running from side to side, between the upper 

 molar teeth, with a longitudinal line in the middle; the soft 

 palate, at the back of the mouth — a sort of dense curtain, 

 hanging between the mouth and throat, which, from its size, 

 does not allow the horse to breathe through the mouth ; the 

 tongue, and the teeth. Owing to the importance of the last- 

 named, they are specially dealt \yith in a separate lecture 

 (Lecture VII. — The Teeth.) The mouth is also lined by 

 mucous membrane. 



2nd. — The Salivary Glands (situated in the region of the mouth. — 

 There are three pairs of these, namely, the parotid glands, (Plate 

 XVIII., Fig. D.J just below each ear ; the sublingual, 

 underneath the tongue ; and the sub-maxillary below, and 

 within the angle of the lower jaw. There is also situated, in 

 the mucous lining of the mouth, the labial, buccal, and mucous 

 fdands. 



