File:The development of the chick; an introduction to embryology (1919) (14568828308).jpg

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Identifier: developmentofchi1919lill (find matches)
Title: The development of the chick; an introduction to embryology
Year: 1919 (1910s)
Authors: Lillie, Frank Rattray, 1870-1947
Subjects: Birds -- Embryology
Publisher: New York, H. Holt and Company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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eip • ji --■>-♦ f % -.-/* Fig. 52. — The same embryo from beneath,a. c. v., Amnio-cardiac vesicle, a. i. p., Anterior intestinal portal.H. F., Head-fold. Pra., Proamnion. the neural folds (Figs. 51 and 56). The latter rise very rapidly,,thus deepening the neural groove, and bend in towards the middleline (Figs. 53,54, etc.,) meeting,by the time four or five somites are HEAD-FOLD TO TWELVE SOMITES 99 formed, a short distance back of the anterior end of the medullaryplate (Figs. 50 and 51). The posterior ends of the neural foldsdo not, at this time, reach the region of the first somite. Theregion where the neural folds first come in contact correspondsapproximately with the region of the future mid-brain, or ante-rior part of the hind-brain.
Text Appearing After Image:
Fig. 52 A. — Median longitudinal section of the head, stage of 4 s. The sec-tion passes through the length of one of the neural folds just behind theanterior end. (Cf. Fig. 5L)a. i. p., Anterior intestinal portal. Ect., Ectoderm. Ent., Entoderm.F. G., Fore-gut. H. F., Head-fold. Mes., Mesoderm. Mes. H. C, Meso-blastic head cavity, n. F., Neural fold. or. pi., Oral plate. The process of closure itself is essentially the same in allregions of the neural tube. Each neural fold has two limbs: aninner thick limb, belonging to the medullar) plate, and an outer,thin limb, continuous with the general ectoderm (cf. Fig. 68 B).When the folds of opposite sides come in contact, the inner limbsof the two sides become continuous with one another, and alsothe outer limbs, the ectoderm then passing continuously over aclosed neural tube. Certain cells in the suture and in the walls of the tube next 100 THE DEVELOPMENT OF THE CHICK

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Flickr tags
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  • bookid:developmentofchi1919lill
  • bookyear:1919
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Lillie__Frank_Rattray__1870_1947
  • booksubject:Birds____Embryology
  • bookpublisher:New_York__H__Holt_and_Company
  • bookcontributor:MBLWHOI_Library
  • booksponsor:MBLWHOI_Library
  • bookleafnumber:117
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
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27 July 2014
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