By Frank J. Lovicu, Michael L. Robinson
This accomplished examine of the developmental biology of the ocular lens will function a reference for graduate scholars and examine scientists within the visible sciences and developmental biology, in addition to for ophthalmologists. explanation of the mechanisms that govern basic lens improvement is key to our realizing of lens issues. The lens has additionally develop into a version for learning extra complicated organ platforms. major specialists in lens improvement and constitution speak about lens induction, evolution, telephone cycle legislation, morphology, fiber mobile differentiation, and regeneration.
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Additional resources for Development of the Ocular Lens
Spemann (1901) was the first to experimentally test the role of the eye rudiment by destroying the presumptive retina of neural plate stage frog embryos without damaging the nonneural head ectoderm, and he found that these embryos subsequently lacked both a retina and a lens. While Spemann’s initial observations supported a simple 1-step model in which interaction with the forming eye rudiment induces the formation of a lens in the closely apposed ectoderm, the ensuing century of experimentation has revealed that lens determination involves more than a simple 1-step inductive interaction with the optic vesicle and begins well before the retinal rudiment contacts the presumptive lens tissue.
12B). A further distinction between the lens of a snake and that of other reptiles is the presence of sutures. Reptiles (with the exception of 22 Michael L. Robinson and Frank J. 12. Representative histological sections of eyes demonstrating the annular pad of a lizard lens (A, arrow), the anterior pad of a snake lens (B, arrow), and the annular pad of a bird lens (C, arrow). Scale bar: (A) and (B), 40 µm; (C), 160 µm. most ophidians), like cyclostomes, do not usually have lens sutures; the fiber cells terminate in one circumscribed area anteriorly and posteriorly.
30 Marilyn Fisher and Robert M. Grainger interpretation was straightforward. Often, however, investigators were confronted with less clear-cut ectodermal thickenings or small vesicles, end points that, while superficially resembling early placode or vesicle stages of lens differentiation, could equally well represent artifacts resulting from the wounding of the epithelium during the experiment. In the case of chick experiments, some authors acknowledged this problem, while others interpreted even ectodermal thickenings as a positive lens response.