. American journal of physiology. ers duct; z. f. A, vascular connective tissue; ^, . 1 1 ^ ^1 ... the stomach close to the peri- s. t., secreting tubules. _ cardial sac. Near the ganglia, theoesophagus is invaginated to form the crop, — a small organ of obscurefunction. Section of the oesophagus anywhere along its length, shows it to bea tube of simple ciliated epithelium, rather rich in mucous cells, andsurrounded by a thick muscular layerconsisting chiefly of circular fibres. Its function is apparently compar-able with that of the oesophagus inhigher animals,— i. c, the transpor-tation of t
. American journal of physiology. ers duct; z. f. A, vascular connective tissue; ^, . 1 1 ^ ^1 ... the stomach close to the peri- s. t., secreting tubules. _ cardial sac. Near the ganglia, theoesophagus is invaginated to form the crop, — a small organ of obscurefunction. Section of the oesophagus anywhere along its length, shows it to bea tube of simple ciliated epithelium, rather rich in mucous cells, andsurrounded by a thick muscular layerconsisting chiefly of circular fibres. Its function is apparently compar-able with that of the oesophagus inhigher animals,— i. c, the transpor-tation of the insalivated food mixturefrom the mouth to the stomach. Aswas demonstrated experimentally,the mucosa apparently containsneither enzymes nor activatingkinases. The stomach is that portion of thealimentary canal which lies super-ficially embedded in the liver, or so called hepato-pancreas. It formsa distinct loop, with a shallow crecum at the angle. Its lumen isconsiderably greater than that of the oesophagus or of the intes-. FiGURE 4. — Section of crop. 111. /.,muscular layer; Iti/n., lumen; /. c,lumen of crop. Experimental Studies on the Physiology of Molluscs. 21
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
