. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 426 SALIVARY GLANDS. slightly viscid saliva by their orifices, which are visible to the unassisted eye. We have already stated that the posterior part of the sublingual gland is occasionally represented by one or more distinct glands in juxta-position, each furnished with a very short excretory duct. These distinct lobes of the gland are in every way analogous to one of the molar glands or larger labial. It will thus be observed that the transition of the primary to the subsidiary glands is by no means rapid, but that th
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 426 SALIVARY GLANDS. slightly viscid saliva by their orifices, which are visible to the unassisted eye. We have already stated that the posterior part of the sublingual gland is occasionally represented by one or more distinct glands in juxta-position, each furnished with a very short excretory duct. These distinct lobes of the gland are in every way analogous to one of the molar glands or larger labial. It will thus be observed that the transition of the primary to the subsidiary glands is by no means rapid, but that they run the one into the other by insensible gradations, the sub- lingual gland passing from the one series into the other. A molar, labial, or buccal gland, with its excretory duct, might then be not inaptly compared, according to its size, to a secondary or tertiary lobule of the parotid, or submaxillary. The labial glands form a series of closely packed small spheroidal glands, of consider- able density, situated in the areolar tissue between the mucous membrane of the mouth and the orbicularis oris muscle, and in relation above and below, consequently, with the upper and lower lip. They are not of uniform volume or number. Sebastian* has observed as many as fifty-seven in the lower lip, and in other instances from thirteen to twenty- one, their size increasing in the inverse ratio to their number. They are more nu- merous in the infant than in the adult. Their excretory ducts open perpendicularly or ob- liquely into the vestibule of the mouth on the posterior or free surface of the labial mucous membrane. They are not visible to the eye when the lips are in their natural lax position, but when the latter are everted, so that the mucous membrane is rendered tense, they form considerable projections. The buccal glands are exactly analogous to the labial glands in form and position, being irregularly spheroidal, and placed between the buccinator and mucous membrane, and open b
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