. The chordates. Chordata. 638 Comparative Morphology of Chordates Part of an excretory A crescent consisting of eight serous cells. Tangential section of serous cells. Mucous cells and thick membrana propria. Connective tissue. Fig. 484. Section of a human sublingual gland. (X252.) (Courtesy, Bremer: "Text-Book of Histology," Philadelphia, The Blakiston Company.) Pharynx and Esophagus The peculiarities of the mammalian pharynx have been described in connection with the account of the respiratory passages (p. 610). The esophagus varies in length according to that of the neck.
. The chordates. Chordata. 638 Comparative Morphology of Chordates Part of an excretory A crescent consisting of eight serous cells. Tangential section of serous cells. Mucous cells and thick membrana propria. Connective tissue. Fig. 484. Section of a human sublingual gland. (X252.) (Courtesy, Bremer: "Text-Book of Histology," Philadelphia, The Blakiston Company.) Pharynx and Esophagus The peculiarities of the mammalian pharynx have been described in connection with the account of the respiratory passages (p. 610). The esophagus varies in length according to that of the neck. It is relatively narrow in mammals, consistent with the fact that they, in contrast to most other vertebrates, ordinarily swallow food in small portions. The cat ingests a mouse in numerous morsels, but so small a snake as a copperhead swallows a mouse, or even a rat, entire, and a python may swallow a whole pig. Such habits require a wide, or at least a highly distensible, gullet. Stomach The stomach exhibits many varieties of form. In most mammals it is a simple, more or less elongated, saclike enlargement of the digestive tube, the cardiac region of it (next to the esophagus) being of greater diameter than the pyloric region. The long axis of the stomach commonly extends more or less nearly transversely to the long axis of the body, the cardiac end being at the left. In many mam- mals the wall of the stomach acquires constrictions which divide the organ into two, three, or even four successive communicating compart- ments. This complication of the stomach is most marked in cetaceans and the cud-chewing (ruminant) ungulates. In the porpoise and most whales the stomach is divided into three or four major chambers, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1
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