_a_, Parotid gland; _b_, submaxillary gland; _c_, inferior, _d_,
middle, and _e_, superior buccal glands; _f_, labial glands; _g_,
buccinator nerve; _h_, buccinator vein; _1_, masseter (cut); _2_,
ramus of mandible; _3_, zygomaticus muscle; _4_, conical papillæ of
lip; _5_, buccinator muscle. (After Ellenberger, in Leisering’s
Atlas.)
]
On the dorsal wall of the pharynx are two large pharyngeal lymph
glands, which, when enlarged, cause difficulty in swallowing and
breathing (Fig. 281).