The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . complementary substancebetween the other tissues, as an inner supporting substanceand as a protective covering for the inner organs. Of thenumerous forms and varieties of connective tissue, we regardthe jelly-like tissue (Fig. 291 : Fig. 6, vol. i. p. 126), the fattytissue, and the chorda tissue as the earlier; tlie fibrous,cartilaginous (Fig. 292), and bone-tissue (Fig. o, vol. i. p. 126)as the more recent formations. All these various forms ofconnective tissue
The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . complementary substancebetween the other tissues, as an inner supporting substanceand as a protective covering for the inner organs. Of thenumerous forms and varieties of connective tissue, we regardthe jelly-like tissue (Fig. 291 : Fig. 6, vol. i. p. 126), the fattytissue, and the chorda tissue as the earlier; tlie fibrous,cartilaginous (Fig. 292), and bone-tissue (Fig. o, vol. i. p. 126)as the more recent formations. All these various forms ofconnective tissue are products of the middle germ-layer,or mesoderm ; or, more accurately, of the two fibrous layers,of which the skin-fibrous layer is originally derived fromthe exoderm, the intestinal-fibrous layer from the nerve-muscular tissue (neuro-Tiiusculwin) is of muchmore recent origin than the connective tissue. If epithelialtissue represents a primary period in tribal history, and 3^4 THE EVOLUTION OF MAN. connective tissue a secondary period, then we may cha-racterize a third, much later period, by nerve-muscle
Size: 1757px × 1422px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectembryology, booksubjectembryologyhum
