. A manual of zoology. THE METAZOA 65 epithelium through a narrow prolongation of the cell, which serves as the duct of the gland. In other cases the gland is multicellular (D, G), formed of a number of cells of the epithelium, lining a depression or infolding, simple or com- plex in form, of the latter. In the central cavity of such a. Fig. 29. —Diagram to illustrate the structure of glands. A .unicellular glands in an epithelium; B, unicellular glands lying below epithelium and communicating with the surface by narrow processes (ducts); C, group of gland cells; D, group of gland cells lining
. A manual of zoology. THE METAZOA 65 epithelium through a narrow prolongation of the cell, which serves as the duct of the gland. In other cases the gland is multicellular (D, G), formed of a number of cells of the epithelium, lining a depression or infolding, simple or com- plex in form, of the latter. In the central cavity of such a. Fig. 29. —Diagram to illustrate the structure of glands. A .unicellular glands in an epithelium; B, unicellular glands lying below epithelium and communicating with the surface by narrow processes (ducts); C, group of gland cells; D, group of gland cells lining a depression; E and Ft simple multicellular gland; G, branched multicellular gland. (From Lang.) gland the secretion collects to reach the surface through a passage, the duct. The general name of connective tissues is applied to a number of tissues which play a passive part in the economy of the animal, connecting and supporting or protecting the various organs. Sometimes connective tissue is gelatinous in character, sometimes fibrous. Fat or adipose tissue is F. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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