. Outlines of zoology. Zoology. 650 MAMMALIA. and the bilobed flap or epiglottis which guards the opening, the paired apertures of the Eustachian tubes opening into the posterior nasal passage, the end of this passage above the glottis, and the beginning of the pharynx. Less obvious are the organs of Jacobson, paired tubular bodies lying en- closed in cartilage in the front of the nasal chamber, and communicating on the one hand with the nostrils, and on the other hand with the mouth by two naso-palatine canals which open a little way behind the posterior incisors. Open- ing into the mouth and
. Outlines of zoology. Zoology. 650 MAMMALIA. and the bilobed flap or epiglottis which guards the opening, the paired apertures of the Eustachian tubes opening into the posterior nasal passage, the end of this passage above the glottis, and the beginning of the pharynx. Less obvious are the organs of Jacobson, paired tubular bodies lying en- closed in cartilage in the front of the nasal chamber, and communicating on the one hand with the nostrils, and on the other hand with the mouth by two naso-palatine canals which open a little way behind the posterior incisors. Open- ing into the mouth and conducting the salivary juice, whose ferment alters the starchy parts of the food, are the ducts of four pairs of salivary glands. The parotid, which is largest, lies between the external ear- chamber and the angle of the mandible; the infra-orbital lies below and in front of the eye; the sub-maxillary lies between the angles of the mandible; the small sub-linguals lie along the inner side of each ramus of the mandible. The pharynx passes into the Fig. 284.âDiagram of caecum gullet, and that leads through in rabbit. the diaphragm to the expanded , Small intestine; *.,-â . jaccuius stomach, which is dilated at its rotundus; co/., sacculated colon; ... c caecum; ,, vermiform upper or cardiac end, and nar- appendix. rowg tQ fae curved pyloric end. Partly covering the stomach is the large liver. The first portion of the intestine, which is called the duodenum, receives the bile duct, and has the pancreas in its folds. Then follows the much-coiled small intestine, measuring many feet in length. The lower end of the small intestine is expanded into a sacculus rotundus. Here the large caecumâa blind diverticulumâis given off; it ends in a finger-like vermiform appendix. Its proximal end is continuous with the colon or first part of the large intestine, the beginning of which is much sacculated. The large intestine narrows into the long rectum, in which lie little faecal pe
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
