A Treatise on Comparative Embryology Volume 2

A Treatise on Comparative Embryology Volume 2

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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. 1881 edition. Excerpt: ...infundibulum; pit. pineal gland; mb. mid-brain; cb. cerebellum; md. medulla oblongata; au.v. auditory vesicle; op. optic vesicle; ol. olfactory pit; m. mouth; br.c. branchial pouches; (A. thyroid involution; r.ao. ventral aorta; lit. ventricle of heart; eh. notochord. which gives rise to the pituitary body (fig. 252 pt), the development, of which will be dealt with separately. In the later stages of development the infundihulum becomes gradually prolonged, and forms an elongated diverticulum of the third ventricle, the apex of which is in contact with the pituitary body (figs. 252, 254 in, and figs. 250 and 255 inf). Along the sides of the infundibulum run the commissural fibres connecting the floor of the mid-brain with the cerebrum. In its later stages the infundibular region presents considerable variations in the different vertebrate types. In Fishes it generally remains very large, and permanently forms a marked diverticulum of the floor of the thalamencephalon. In Elamobranchii the distal end becomes divided into three lobes--a median and two lateral. The lateral lobes appear to become the sacci vasculosi of the adult. In Teleostei peculiar bodies known as the lobi inferiores (hypoaria) make their appearance at the sides of the infundibulum. They appear to correspond in position with the tuber cinereum of Mammalia'. Iu Birds, Reptiles, and Amphibia the lower part of the embryonic infundibulum becomes atrophied and reduced to a mere fingerlike process--the processus iufundibuli. In Mammalia the posterior part of the primitive infundibulum becomes the corpus albicans, which is double in Man and the higher Apes; the ventral part of the posterior wall forms the tuber cinereum. Laterally, at the junction of the optic thalami and infundibulum, ...show more

Product details

  • Paperback | 304 pages
  • 189 x 246 x 16mm | 544g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236560345
  • 9781236560346