Elements of animal physiology, chiefly human . er the tongue; but not quite so far backas the sub-maxillary. Their ducts also pour the sali^^ainto the mouth under the tip of the tongue. 252. The Saliva or spittle is the thin, watery, slightly IHfi PHARYNX. 121 viscid and frothy liquid poured into the mouth from thebuccal and salivary glands. It usually contains a littlemucus, also epithelial scales, which render it slightlyopalescent. It contains a small quantity of a peculiar nitrogenousprinciple, capable of converting starch into sugar; thisprinciple, which does not act on fats or albuminous
Elements of animal physiology, chiefly human . er the tongue; but not quite so far backas the sub-maxillary. Their ducts also pour the sali^^ainto the mouth under the tip of the tongue. 252. The Saliva or spittle is the thin, watery, slightly IHfi PHARYNX. 121 viscid and frothy liquid poured into the mouth from thebuccal and salivary glands. It usually contains a littlemucus, also epithelial scales, which render it slightlyopalescent. It contains a small quantity of a peculiar nitrogenousprinciple, capable of converting starch into sugar; thisprinciple, which does not act on fats or albuminous sub-stances (proteids), is termed ptyalin. 253. The Pharynx (from Gr. pharugx, the gullet) is thefunnel-shaped part of the alimentary canal, which isplaced immediately behind the mouth, nose, and is separated from the cavity of the mouth by the softpalate, uvula, and the epiglottis (see fig. 55). It is about Superior middle and iuXerior Tarbinal Boues. Opening of IjachrymalDuct. Hard Palate. Ilyoid Bon*. Thyroid Cartila-eof ,. • Cribriform plataof Ethmoid Sphenoid Cone. Opening of EustachiaaTube, Cody of Aertebra. riiterrertebral Pad. Jrycoid Ca-tila re CEsophagus^ Fig. 55. Section of Mouth, Nose, Pharynx, (Esophagus, Larynx,Trachea, &c. 4 J inches long, varies from 2 inches at its upper to 1 \2^ Animal pSysiology. inch at its lower extremity, and has seven openingsinto it—viz., the two posterior nares (nostrils), the twoEustachian tubes, the mouth, larynx, and oesophagus. Likethe rest of the alimentary canal, its interior is linedby mucous membrane. It is supplied with severalmuscles. 254. The (Esophagus (from Gr. oisd, I carry; andphago, I eat), gullet or food-pipe, is the musculo-mem-hranous tube which forms that part of the alimentarycanal which passes from the pharynx through the dia-phragm, to the cardiac orifice of the stomach. It is about9 inches long, and forms the narrowest part of the ali-mentary canal. Its itjope? part is sup
Size: 1263px × 1978px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, bookdecade1870, booksubjectanatomy, booksubjectphysiology
