单语范例（未经PONS编辑处理）
英语
- Optic vesicles are outgrowings of the brain which make contact with the surface ectoderm and this contact induces changes necessary for further development of the eye.en.wikipedia.org
- These diverticula make their appearance before the closure of the anterior end of the neural tube; after the closure of the tube they are known as the optic vesicles.en.wikipedia.org
- Failure of the cells of the posterior portion of the optic vesicles to express growth hormone affects the differentiation of other cells of the eye.en.wikipedia.org
- Pax6 also plays a role in the initial formation of the optic vesicle, and in differentiation of retinal cells.www.evolutionnews.org
- Rather, it is triggered by the release of several chemicals, called "inducers," from the optic vesicle.www.evolutionnews.org
- The optic vesicle gives rise to three structures: the neural retina, the retinal pigmented epithelium, and the optic stalk.en.wikipedia.org
- Once the optic vesicle has contacted the epithelium, it spreads outwards and folds in on itself.www.evolutionnews.org
- Both the optic vesicle and the head epidermis are required for eye development.en.wikipedia.org
- The optic disc originates from the optic cup when the optic vesicle invaginates and forms an embryonic fissure (or groove).en.wikipedia.org
- Through a groove at the bottom of the optic vesicle known as choroid fissure the blood vessels enter the eye.en.wikipedia.org
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