THE SALIVARY GLANDS. f!9 



in the submucous tissue. These capsules are analogous to those of Peyer's 

 glands ; they contain a thick grayish secretion. 



The arteries supplying the tonsil are the dorsal is linguas from the lingual, the 

 ascending palatine and tonsillar from the facial, the ascending pharyngeal from 

 the external carotid, and the descending palatine branch of the internal max- 

 illary. 



The veins terminate in the tonsillar plexus, on the outer side of the tonsil. 



The nerves are derived from the fifth, and from the glosso-pharyngeal. 



THE SALIVAKY GLANDS. (Fig. 395.) 



The principal Salivary Glands communicating with the mouth, and pouring 

 their secretion into its cavity, are the parotid, submaxillary, and sublingual. 



The Parotid gland, so called from being placed near the ear (opa, near; ov$, 

 wroj, the ear), is the largest of the three salivary glands, varying in weight from 

 half an ounce to an ounce. It lies upon the side of the face, immediately below 

 and in front of the external ear. It is limited above by the zygoma; below, 



Fig. 395. The Salivary Glands. 



by the angle of the jaw, and by an imaginary line drawn between it and the 

 Sterno-mastoid muscle; posteriorly, it is bounded by the external meatus, the 

 mastoid process, and the Sterno-mastoid and Digastric muscles, slightly over- 

 lapping the former. 



Its anterior surface is grooved to embrace the posterior margin of the ramus 

 of the lower jaw, and advances forwards beneath the ramus, between the two 

 Pterygoid muscles. Its outer surface, slightly lobulated, is covered by the 

 integument and fascia, and has one or two lymphatic glands resting on it. Its 

 inner surface extends deeply into the neck, by means of two large processes, 

 one of which dips behind the styloid process, and projects beneath the mastoid 

 process and the Sterno-mastoid muscle; the other is situated in front of the 

 styloid process, and passes into the back part of the glenoid fossa, behind the 

 articulation of the lower jaw. Imbedded in its substance is the external 



