THE MOUTH 



383 



half an inch (ca. 1 to 1.5 cm.) and are situated around the angle of the mouth and 

 parallel with the cheek teeth. The orifice of the parotid duct is opposite the fifth 

 upper check tooth. (In the sheep and goat it is opposite the fourth tooth.) The 

 buccal or molar glands are very well developed, and are arranged in three parts. 

 The dorsal row extends from the maxillary tuberosity to the angle of the mouth. 

 Its lobules are of a light yellow color. The ventral part consists of a compact 



Frontal sinu 



Cavity of great ethmolurbinal 



avity of superior iurbinal 



avities of inferior turbinal 



Vesti- 

 bule of 

 larynx 

 Thyroid 

 cartilage 



Hyoid 

 bone 



My^o-hyoideUL 

 VI uscle 



Fig. 281. — Sagittal Sectio.v of Head of Cow, Cut a little to the Right of the Median Plane. 

 i, Cerebral hemisphere; ^, corpus striatum; 3, hippocampus; ^, olfactory bulb; 5, corpora quadrigemina; 

 6, optic nerve; 7, pons; S, medulla oblongata; 9, spinal cord; ^0, pituitary body; 7 i, sphenoid sinus; i^, lateral 

 mass of ethmoid; 13, ventral straight muscles; 14, pharyngeal (retropharyngeal) lymph gland; 15, longus colli; 

 16, soft ijalate; 17, vallate papillie; IS, tonsillar sinus; 19, conical papilke of cheek; 20, hyo-ei)iglotticus mus- 

 cle; ^7, epiglottis; 2^, hyo-glossus muscle; Cl,C2, atlas, axis. Subject was hardened with mouth open. 



brownish mass which reaches from the angle of the mouth a short distance under 

 the masseter muscle. The middle part consists of loosely arranged yellow lobules. 



A linear series of large papillae exists on the floor of the mouth on each side of 

 the frenum linguae. Near these are found the openings of the small ducts of the 

 sublingual gland. The papilla on which the submaxillary duct opens is wide, hard, 

 and has a serrated edge. 



The hard palate is wide, and is usually more or less pigmented. The body of 

 the premaxilla is covered with a thick layer of dense connective tissue, which has a 



