. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. l of a section of the lower jaw. 238. The parotid gland, the largest. Is situated in frontof the external ear, and behind the angle of the jaw. Aduct (Stenos) from this gland opens into the mou^h, oppositethe second molar tooth of the upper jaw. 237. How many glands about the mouth ? Give their names. Whatdoes fig. 58 represent? 233. Describe the parotid gland. ANATOMY OF THE DIGESTIVE ORGANS. 115 239. The submaxillary gland is situated within the lowerjaw, anterior to its angle. Its excretory duct
. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. l of a section of the lower jaw. 238. The parotid gland, the largest. Is situated in frontof the external ear, and behind the angle of the jaw. Aduct (Stenos) from this gland opens into the mou^h, oppositethe second molar tooth of the upper jaw. 237. How many glands about the mouth ? Give their names. Whatdoes fig. 58 represent? 233. Describe the parotid gland. ANATOMY OF THE DIGESTIVE ORGANS. 115 239. The submaxillary gland is situated within the lowerjaw, anterior to its angle. Its excretory duct (Whartons)opens into the mouth by the side of the frcenum linguce^(bridle of the tongue.) 240. The sublingual gland is elongated and flattened,and situated beneath the mucous membrane of the door ofthe mouth, on each side of the fnenum linguiie. It has sevenor eight small ducts, which open into the moutli by the sideof the bridle of the tongue. Observation. In the mumps, the parotid gland isdiseased. The swelling under the tongue called the frogis a disease of the sublingual gland. Fig. Fig. 59. A side view of th3 face, oesophagus, and trachea. 1, Tlie trachea (wind-pipe.) 2, The larynx. 3, ajeophajius. 4, 4, 4, The muscles of the upper portionof the oesophagus, forming the pharynx. 5, Tlie muscle of tlie cheek. 6, TJ)e mus-cle that surrounds the mouth. 7, The muscle that forms the floor of the mouth. 241. The PHARYNX is a membranous sac, situated upon the 239. The submaxillary. 240. The sublingual. Wliat observation respect-ing these glands ? What does fig. 59 represent r 116 ANATOKY, PHYSIOLOGY, AND HITGIENE. upper portion of the spinal column. It extends from the baseof the skull to the top of the trache-a^ (windpipe,) and iscontinuous with the oesophagus. From the pharynx are fourpassages ; one opens upward and forward to the nose, thesecond leads forward to the mouth, the third downward to thetrachea and lungs, the fourth downward and backward to thestomach. 242
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