File:Mammals Five diagrammatic longitudinal sections through the maturing germ and its egg-membranes.jpg
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| Description | Fig. 94. — Five diagrammatic lonpitudinal sections through the maturing mammalian germ and its egg-membranes. In Fig. 1-4, the longitudinal section passes through the sagittal plane, or the central plane of the body, which seperates the right and left halves ; in Fig. 5, the germ Is seen from the left side. In Fig. 1, the tufted (d) chorion encloses the germ-vesicle, the wall of which consists of the two primary germ-layers. Between the outer (o) and inner (t) germ-layers, the middle germ-layer (m) has developed, co-extensively with the germ-area. In Fig. 2, the embryo (e) is beginning to separate from the germ-vesicle (ds), while the wall of the amnion-fold ia developing round it (in front as the head-sheath, ks, in rear as tail-sheath, ss). In Fig. 3, the edges of the amnion-fold (ant) meet above the back of the embryo and thus form the amnion-cavity (ah) ; while the embryo (e) separates still more from the germ-vesicle, the intestinal canal (dd) is developed, and from the posterior end of this, the allantois (al) grows out. In Fig. 4, the allantois (al) becomes larger ; the yelk-sac (ds) smaller. In Fig. 5, the embryo shows the gill-openings and the rudiments of the two pairs of limbs ; the chorion has formed branching tufts. In all the five figures e signifies embryo ; a, outer germ-layer ; m, middle germ-layer ; t, inner germ-layer ; otn, amnion (ks, head-sheath ; sa, tail-sheath) ; ah, amnion-cavity; as, amnion-sheath of the umbilical cord; kh=ds, intestinal germ-vesicle ; ds, yelk-sac (navel-vesicle) ; dg, yelk-duct ; df, intestinal-fibrous layer; dd, intestinal-glandular layer; al, allantois; vl=hh, region of the heart; d, yelk-membrane {prochorion) ; d', tufts on prochorion; sh, serous membrane ; si, tufts of the foregoing ; ch, tufted membrane or chorion; r, the space between the amnion and chorion, filled with fluid. (According to Kölliker.) Compare Table V. Fig. 14 and 15. |
| Date | |
| Source | https://archive.org/details/cu31924024561114/page/312/mode/1up?view=theater&q=240 The evolution of man: a popular exposition of the principal points of human ontogeny and phylogeny. Appleton New York |
| Author | Haeckel, Ernst Heinrich Philipp August |
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| current | 00:05, 17 March 2024 | | 1,270 × 1,902 (678 KB) | Rasbak (talk | contribs) | {Information |description=Fig. 94. — Five diagrammatic lonpitudinal sections through the maturing mammalian germ and its egg-membranes. In Fig. 1-4, the longitudinal section passes through the sagittal plane, or the central plane of the body, which seperates the right and left halves ; in Fig. 5, the germ Is seen from the left side. In Fig. 1, the tufted (d) chorion encloses the germ-vesicle, the wall of which consists of the two primary germ-layers. Between the outer (o) and inner (t) germ-l... |
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