Identifier: anatomydescripti1887gray (find matches)
Title: Anatomy, descriptive and surgical
Year: 1887 (1880s)
Authors: Gray, Henry, 1825-1861 Pick, T. Pickering (Thomas Pickering), 1841-1919, ed Keen, William W. (William Williams), b. 1837
Subjects: Human anatomy Anatomy
Publisher: Philadelphia : Lea brothers & co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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ter of saccules; and thus we may have thesecreting surface almost indefinitely extended, as in the salivary glands (Fig. 77, e).In the compound tubular glands the division of the primary duct takes place in thesame way as in the racemose glands, but the branches retain their tubular form, anddo not terminate in saccular recesses, but become greatly lengthened out (Fig. 77, f).The best examples of this form of gland are to be found in the kidney and testicle.All these varieties of glands are produced by a more or less complicated involution 7 98 GENERAL ANATOMY. of a secreting membrane, and they are all identical in structure; that is to say, thesaccules or tubes, as the case may be, are lined with cells, generally spheroidal orcolumnar in figure, and on their outer surface is an intimate plexus of capillary ves-sels. The secretion, whatever it may be, is eliminated by the cells from the blood,and is poured into the saccule or tube, and so finds its way out through the primary Fig. 77.
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Diagrammatic Plan of Varieties of Secreting Glands: A, simple gland; B, sacculated simple gland; C, simpleconvoluted tubular gland; D, E, racemose gland; F, compound tubular gland. involution on to the free surface of the secreting membrane. In addition, however,to these glands which are formed by an involution of the secreting membrane, thereare some few others which are formed by a protrusion of the same structure, as inthe vascular fringes of synovial membranes. This form of secreting structure is notnearly so frequently met with. Origin and Development of the Body. THE whole body is developed out of the ovum (Fig.. 78) when fertilized by thespermatozoa. The ovum is merely a simple nucleated cell or collection of pro-toplasm, and the spermatozoa disappear when they have accomplished their mysteri-ous function. All the complicated changes by which the various intricate organs ofthe whole body are formed from one simple cell may be reduced to two general pro-cesses—viz. the segment

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