File:Bailey462.jpg

From Embryology
Bailey462.jpg(463 × 411 pixels, file size: 45 KB, MIME type: image/jpeg)

Fig. 462. Showing somewhat later stage in development of optic cup and lens than is shown in Fig. 461

Duval.

The thickened portion of ectoderm is known as the lens area (Fig. 460). The latter next becomes depressed against the outet surface of the optic vesicle forming a distinct lens invagination (Fig. 461). This becomes cup-shaped and then its edges come together and fuse, thus forming the lens vesicle (Fig. 462). At first the lens vesicle is connected with the surface ectoderm, but about the eighth week a thin layer of mesoderm grows in between the lens vesicle and the surface ectoderm, completely separating them (Fig. 463).


Text-Book of Embryology: Germ cells | Maturation | Fertilization | Amphioxus | Frog | Chick | Mammalian | External body form | Connective tissues and skeletal | Vascular | Muscular | Alimentary tube and organs | Respiratory | Coelom, Diaphragm and Mesenteries | Urogenital | Integumentary | Nervous System | Special Sense | Foetal Membranes | Teratogenesis | Gallery of All Figures
Historic Disclaimer - information about historic embryology pages 
Mark Hill.jpg
Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.



Cite this page: Hill, M.A. (2019, July 17) Embryology Bailey462.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey462.jpg

What Links Here?
© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current13:46, 1 February 2011Thumbnail for version as of 13:46, 1 February 2011463 × 411 (45 KB)S8600021 (talk | contribs)
  • You cannot overwrite this file.