File:The American journal of anatomy (1901) (14783663422).jpg

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Identifier: americanjournalo06wist (find matches)
Title: The American journal of anatomy
Year: 1901 (1900s)
Authors: Wistar Institute of Anatomy and Biology Association of American Anatomists
Subjects: Anatomy Anatomy
Publisher: Baltimore, MD : (s.n.)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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r layer for lens formation. X 45 diameters. Fig. 6. Experiment VIII75. Section through normal lens after 6 days.X 180 diameters. Fig. 7. Experiment VIII75. Section through right lens of above embryo6 days after the complete extirpation of the optic vesicle, showing abnormaldevelopment as a resultant effect. At the time of the operation the lens-plate was visible as a mere thickening of the ectoderm. X 180 diameters. Fig. 8. Experiment VIII39. Section through the right lens of an embryokilled 30 days after removal of the optic vesicle. The lens shows markedretardation and lack of differentiation, and the lens-fibers are much degen-erated. It measures about 110 u in diameter, being much smaller than thenormal lens. X 180 diameters. Fig. 9. Experiment VIILg. Section through normal left lens of aboveembryo after 30 days. 260 /u in diameter. (Contrast Fig, 8.) X 180 diame-ters. The Roman numerals indicate the operative stage. ORIGIN AND DIFFERENTIATION OF THE LENS WILBUR L. LE CRON PLATE 1
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AMERICAN JOURNAL OF ANATOMY -VOL. VI PLATE II. Fig. 10. Outline drawing of an embryo of the third operative stage (IX).X 6% diameters. Fig. 11. Section through eye region of an embryo of the same stage (IX)as above, showing the lens-plate thickening of the inner layer of ectoderm.X 45 diameters. Fig. 12. Experiment IX,,. Section through right abortive lens of anembryo 8 days after the removal of the optic vesicle. There is an Indicationof the medial-pole, but no definite lens-fibers are present. The lens measures140 11 in diameter, being much smaller than the normal one below. X 180diameters. Fig. 13. Experiment IX--. Section through left normal lens of aboveembryo after 8 days. Developed from lens-plate thickening of ectoderm(IX) to lens 170 //in diameter. X 180 diameters. Fig. 14. Experiment IX^. Section through right abortive lens, showingdegenerated ectodermal cells apparently, and no well defined medial-pole.The embryo was killed 14 days after the removal of the optic vesicle. X

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v. 6
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30 July 2014

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