Descriptive Catalogue of the Embryological Models

Descriptive Catalogue of the Embryological Models

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ... the vesicle. The condition shown in the model is derived from that of the fourth day, described on p. 49, in the following manner: --The circular patch of inner cells of the fourth day splits into two layers, upper and lower: of these the upper layer becomes the epiblast of the embryonal area of the model, and the lower layer the hypoblast. The thin epiblastic wall of the rest of the vesicle is derived directly from the outer cells of the fourth day, which originally cover the embryonal area as well, but disappear from this during the sixth day. Both layers--epiblast and hypoblast-of the embryonal area are thus derived from the inner cells of the fourth day, while the epiblast of the rest of the vesicle is formed from the outer cells of the fourth day. x Io. MoDEL 2. Blastodermic vesicle of a Rabbit towards the end of the 7th day. The whole vesicle has increased in size. The hypoblast (yellow), which was previously confined to the embryonal area, has now spread, by growth at its margin, so as to line the upper half of the vesicle. At this stage, therefore, the lower half or hemisphere of the blastodermic vesicle consists of a single layer of cells, epiblast, alone; the upper half or hemisphere consists of two layers of cells, epiblast and hypoblast; and in the centre of the upper half is the embryonal area, characterised by the greater thickness of the epiblast cells, which are here columnar in shape, while over the rest of the vesicle they are flattened. x 9 MODEL 3. Blastodermic vesicle of a Rabbit during the earlier part of the 8th day. The blastodermic vesicle has increased further in size, and is usually somewhat ovoidal in shape. Up to this time it has been lying quite freely in the uterus, but it now begins to acquire attachment to..show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236787323
  • 9781236787323