File:Hand-book of physiology (1892) (14762772644).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 46.—Part of a section of a lymphatic gland,from which the corpuscles have been for themost part removed, showing the adenoid reti-culum. (Klein and Noble Smith.) ch. in.) DEVELOPMENT OF FIBKOUS TISSUE. 49 Development of Fibrous Tissues.—In the embryo theplace of the fibrous tissues is at first occupied by a mass ofroundish cells, derived from the mesoblast. These develop either into a network of branched cells or intogroups of fusiform cells (fig. 47). The cells are embedded in a semi-fluid albuminous substancederived either from the cells themselves or from the neighbouringblood-vessels ; this afterwards forms the cement substance. In itfibres are developed, either by some of the cells becoming fibrils,the others remaining as connective-tissue corpuscles, or by thefibrils being developed from the outside layers of the protoplasm
Text Appearing After Image:
Fig. 47.—Portion of submucous tissue of gravid uterus of sow. a, branched cells, more orless spindle-shaped; I, bundles of connective tissue. (Klein.) of the cells, which grow up again to their original size and remainembedded among the fibres. The process gives rise to fibresarranged in the one case in interlacing networks (areolar tissue),in the other in parallel bundles (white fibrous tissue). In themature forms of purely fibrous tissue not only the remnants ofthe cell-substance, but even the nuclei, may disappear. Theembryonic tissue, from which elastic fibres are developed, iscomposed of fusiform cells, and a structureless intercellularsubstance by the gradual fibrillation of which elastic fibres areformed. The fusiform cells dwindle in size and eventually dis-appear so completely that in mature elastic tissue hardly a traceof them is to be found : meanwhile the elastic fibres steadilyincrease in size. Another theory of the development of the connective-tissuefibrils supposes t

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