This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 Excerpt: ...behind in A and B Is SeeSsel s pouch; St. stomach; t. tongue; IHti. median rudiment of thymus gland; tr. trachea; u. ureter; umo. umbilical vesicle; v.d. vitelline duct; W.d. Wolffian duct. of the liver in the human embryo, and later shifts its position to behind that viscus (fig. 143, B-d). Hollow diverticula arise ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 Excerpt: ...behind in A and B Is SeeSsel s pouch; St. stomach; t. tongue; IHti. median rudiment of thymus gland; tr. trachea; u. ureter; umo. umbilical vesicle; v.d. vitelline duct; W.d. Wolffian duct. of the liver in the human embryo, and later shifts its position to behind that viscus (fig. 143, B-d). Hollow diverticula arise from the main duct, which continually subdivide. The surrounding mesoblast develops as usual into blood-vessels and connective tissue. In some cases two pancreatic diverticula have been observed. Intestine.--The intestine is the post-gastric portion of the mesenteron. It is always a straight tube in embryos, and persists as such in many of the lower Chordata. In other forms it becomes variously looped, owing to its length exceeding that of the body cavity within which it lies. The posterior portion of the intestine in the adult, but not iu the embryo, is usually of markedly greater diameter than the anterior portion or small intestine; it is known as the large intestine. The secreting and absorbing surface of the alimentary canal is increased in the lowest Vertebrates by the development of a longitudinal fold projecting into the cavity of the intestine, which is known as the spiral valve. The fold is slightly developed in the Cyclostomi, and reaches its highest state of development in some Elasmobranchs. It becomes less marked in the Ganoids, and traces of it may be found in the intestine of a few Teleosts. In no higher Vertebrate has it been definitely recognised. A similar fold is found in the intestine of some Ascidians; such a fold may be compared with the typhlosole of certain Invertebrates (ex. Earthworm and Fresh-water Mussel). i n m Concomitantly, according to Wiedersheim, with the disappearance of the spiral valve in Fishes a number of ...
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Add this copy of An Introduction to the Study of Embryology to cart. $20.61, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2023 by Mjp Publishers.
Add this copy of An Introduction to the Study of Embryology to cart. $33.03, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2023 by Mjp Publishers.
