. A text-book of agricultural zoology. Zoology, Economic. 430 MAMMALIA. and sub-zonal membrane unite, a false chorion is formed. Thus where the placenta is formed is the true chorion, the other part the false chorion. From the outer surface of this chorion, which is highly vascu- lar, villi grow out which fit into the crypts or pits in the uterus (cr). These villi may become much branched. Not only are the villi highly vascular, but the uterine pits are likewise. Here. Fig. 204.—^Vertical Section of injected Placekta of a Mare. dh, Chorion ; cr, uterine crypts; g, uterine glands; V, Wood-vesse
. A text-book of agricultural zoology. Zoology, Economic. 430 MAMMALIA. and sub-zonal membrane unite, a false chorion is formed. Thus where the placenta is formed is the true chorion, the other part the false chorion. From the outer surface of this chorion, which is highly vascu- lar, villi grow out which fit into the crypts or pits in the uterus (cr). These villi may become much branched. Not only are the villi highly vascular, but the uterine pits are likewise. Here. Fig. 204.—^Vertical Section of injected Placekta of a Mare. dh, Chorion ; cr, uterine crypts; g, uterine glands; V, Wood-vessels; S, epithelium. (Turner.) there takes place that interchange of blood by diffusion between the parent and foetus. The yolk or umbilical sac becomes smaller (fig. 205, tiv), and may atrophy before the close of uterine existence. The allantoic stalk gives rise to two structures, the urinary bladder and a cord, the urachus, which connects the bladder with the umbilicus. These membranes are shed at birth, and sometimes. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
