File:Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct - for the use of schools and colleges (1870) (14782430122).jpg

Identifier: outlinesofcompar00agas (find matches)
Title: Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges
Year: 1870 (1870s)
Authors: Agassiz, Louis, 1807-1873 Gould, Augustus A. (Augustus Addison), 1805-1866 Wright, Thomas, 1809-1884
Subjects: Physiology, Comparative Zoology
Publisher: London : Bell & Daldy
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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me process even acquiring a prettycomplicated mulberry appearance (fig. 184, B. /). Theventricular glands of mammals are already somewhat morecompound (fig. 181, et seq.). The extent of secreting sur- STRUCTURE OF GLANDS. 24? face can be increased without any additional external com-plexity, by a capsule or canal extended in length, and at thesame time rolled up or convoluted upon itself. We have anexample of this kind of gland in the ceruminous glands of theear (fig. 2-48, A. B), and in the sudoriparous glands (fig. 249,A. B). We have only to conceive these two forms farthersubdivided, ramified, and the several parts connected bymeans of vessels and cellular tissue, to have a perfect idea ofthe most complex parenchymatous gland. The skeleton ofevery gland is the ramified excretory duct, formed in the man-ner already described, to which are attached the secreting «/ blind sacs, vesicles, or tubes, connected together by cellulartissue, and surrounded by net-works of capillary vessels.
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B Fig. 248.—Glands from the meatus auditorius externus of a young fe-male of eighteen. A, section of the skin, seen magnified three diameters;b, b, hairs ; c, c, superficially situated sebaceous glands; a, a, larger andmore deeply seated glands, which are coloured yellow, and appear tosecrete the cerumen. B, a gland of this kind more highly magnified;a, <z, the tortuous canal composing the gland and passing over into theexcretory duct b ; c, a. small vessel, with its branches. C, a hah- of theauditory passage, penetrating the epidermis at c, and at d, containedwithin its double follicle e, e; a, a, sebaceous follicles of the hair, withtheir excretory ducts. 248 STRUCTURE OF GLANDS.

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