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The optic vesicles project toward the sides of the head, and the peripheral part of each expands to form a hollow bulb, while the proximal part remains narrow and constitutes the optic stalk. [1] [2] Closure of the choroidal fissure in the optic stalk occurs during the seventh week of development. The former optic stalk is then called the optic ...
These diverticula make their appearance before the closure of the anterior end of the neural tube; [1] [2] after the closure of the tube around the 4th week of development, they are known as the optic vesicles. Previous studies of optic vesicles suggest that the surrounding extraocular tissues – the surface ectoderm and extraocular mesenchyme ...
The optic vesicles then develop into the optic cup with the inner layer forming the retina and the outer portion forming the retinal pigment epithelium. The middle portion of the optic cup develops into the ciliary body and iris. [7] During the invagination of the optic cup, the ectoderm begins to thicken and form the lens placode, which ...
The retina is generated from the precursor cells within the inner layer of the optic cup, as opposed to the retinal pigment epithelium that originate from the outer layer of the optic cup. [ 4 ] [ 5 ] In general, the developing retina is organized so that the least-committed precursor cells are located in the periphery of the retina, while the ...
This page was last edited on 21 May 2011, at 03:46 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...
PetSafe Multi-Cat Litter Box Most cats prefer an open-top litter box so they can keep an eye on their surroundings. This one by PetSafe measures over 30 inches in length, giving your cat plenty of ...
A cat will see a a narrow tall cat tree that you can shove in a corner as four or five entirely distinct habitats and may even pick a different spot every hour to nap in.
Most cat bites just need to be cleaned and treated with antibiotics and tetanus shots, but a 2019 study of serious cat bites showed that human patients needed an average of three days of ...
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