File:Patten021.jpg

Fig. 21. Dorsal view ( X 14) of an entire chick embryo of 12 somites

about 33 hours incubation

By about 33 hours of incubation the optic vesicles are established as paired lateral outgrowths of the prosencephalon. They soon extend to occupy the full width of the head (Fig. 20, C and Fig. 21). The distal portion of each of the vesicles thus comes to lie closely approximated to the superficial ectoderm, a relatibnship of importance in their later development. At first the cavities of the optic vesicles (opticoeles) are broadly confluent with the cavity of the prosencephalon (prosocoele) . Somewhat later constrictions appear which mark more definitely the boundaries between the optic vesicles and the prosencephalon (Fig. 20, D and Fig. 22).

Links: Introduction | Gametes and Fertilization | Segmentation | Entoderm | Primitive Streak and Mesoderm | Primitive Streak to Somites | 24 Hours | 24 to 33 Hours | 33 to 39 Hours | 40 to 50 Hours | Extra-embryonic Membranes | 50 to 55 Hours | Day 3 to 4 | References | All Figures

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Reference

Patten BM. The Early Embryology of the Chick. (1920) Philadelphia: P. Blakiston's Son and Co.

Cite this page: Hill, M.A. (2024, April 27) Embryology Patten021.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Patten021.jpg

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