File:Brown003.jpg: Difference between revisions

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Fig. 3. Vertical Section through Head of Foetal Pig, 2 mm long

Magnified 2,500 times.

As this stalk grows outward, the anterior portion rises upward, as shown in vertical section at A, Fig. 3. When the optic stalk comes near to the surface, the anterior portion enlarges, as shown at C, Fig. i. Also when the optic stalk encroaches on the surface, it stimulates the epithelial cells forming- the skin and they multiply rapidly (see B, Figs. I and 3), and the anterior wall of the primary optic vesicle invaginates and passes inside of the vesicle. (See A, Fig. 2, and C, Fig. 3.) This invagination might be likened to the denting of a hollow rubber ball. 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.

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

Reference

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

Cite this page: Hill, M.A. (2024, April 19) Embryology Brown003.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Brown003.jpg

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+==Fig. 3. Vertical Section through Head of Foetal Pig, 2 mm long==
+Magnified 2,500 times.
+As this stalk grows outward, the anterior portion rises upward, as shown in vertical section at A, Fig. 3. When the optic stalk comes near to the surface, the anterior portion enlarges, as shown at C, Fig. i. Also when the optic stalk encroaches on the surface, it stimulates the epithelial cells forming- the skin and they multiply rapidly (see B, Figs. I and 3), and the anterior wall of the primary optic vesicle invaginates and passes inside of the vesicle. (See A, Fig. 2, and C, Fig. 3.) This invagination might be likened to the denting of a hollow rubber ball. 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.
 {{Template:Brown 1906 Figures}}
+[[Category:Pig]]