Outlines of human physiology; designed for the use of the higher classes in common schools . to the mouth. This fluid is called saliva, andis an important agent in the first part of the process ofdigestion. The largest of these glands are called paro-tid^ from being situated about the ear. The tubewhich conveys their secretion into the mouth, piercesthe muscle in the cheek, and has been called the ductor canal of Steno, from an anatomist who described is this gland which is the seat of the disease knownby the name of the Mumps. The sub-maxillary glandsare situated under the lower jaw, an
Outlines of human physiology; designed for the use of the higher classes in common schools . to the mouth. This fluid is called saliva, andis an important agent in the first part of the process ofdigestion. The largest of these glands are called paro-tid^ from being situated about the ear. The tubewhich conveys their secretion into the mouth, piercesthe muscle in the cheek, and has been called the ductor canal of Steno, from an anatomist who described is this gland which is the seat of the disease knownby the name of the Mumps. The sub-maxillary glandsare situated under the lower jaw, and the sub-lingualunder the tongue. An obstruction in the duct of oneor both of the sub-maxillary glands, produces thatsingular affection which is called ranula or consists of a swelling, sometimes of the size of a pi-geons egg, resembling a bladder, situated directly underthe tongue. It is not unfrequently met with in chil-3* 30 DIGESTION. dren. It is computed that no less than eight ounces ofsaliva are poured into the mouth, from these differentglands, at every full a Parotid Gland, b Duct for conveying the salivainto the mouth. In immediate connexion with the mouth, and situatedin the posterior part of it, is the pharynx, so called,which is the commencement of the passage to the sto-mach. It is of an irregular form, being considerablylarger at its upper, than at its lower extremity. Its con-tinuation is called oesophagus, which is of a cylindricalshape, and of nearly an uniform size. It extends fromthe pharynx to the stomach. Both of these passages arelined by the mucous membrane, which is surrounded bymuscular fibres, and supplied with nervous filaments andblood-vessels. It is by the means of the pharynx and oeso-phagus that the act of deglutition or swallowing is effected. The stomach is the largest organ of digestion. It isof an irregular shape, and closely resembles the bag of DIGESTION. 31 a bag-pipe. It lies directly across the body, just underthe
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