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Fig. 4. Horizontal Section through Head of Foetal Pig, 3 mm long

Magnified about 1,200 times.

This invaginated portion forms the secondary optic vesicle and it is from this that the nine innermost layers of the retina are eventually formed, while the primary optic vesicle only forms the outer or pigment layer. As the secondary optic vesicle is passing into the primary optic vesicle there appears in front of the secondary optic vesicle a depression on the surface at the point of activity of the epithelial cells. (See A, Fig. 4, and A, Fig. 5.) This depression becomes deeper and deeper and the mouth is finally closed by the rapid formation of cells around the depression, as shown at B and C, Figs. 4 and 5.

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The Embryology Anatomy and Histology of the Eye: Embryology | Anatomy | Histology | Figures


Brown EJ. The embryology anatomy and histology of the eye. (1906) Chicago: Hazlitt & Walker.

Cite this page: Hill, M.A. (2024, May 30) Embryology Brown004.jpg. Retrieved from

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current13:12, 14 February 2011Thumbnail for version as of 13:12, 14 February 2011800 × 618 (93 KB)MarkHill (talk | contribs){{Template:Brown 1906 Figures}}