Optic stalk
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optic stalk
(′äp·tik ′stök)
(embryology) The constriction of the optic vesicle which connects the embryonic eye and forebrain in vertebrates.
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Optic stalk
| Optic stalk | |
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| Transverse section of head of chick embryo of fifty-two hours’ incubation. | |
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| Optic cup and choroidal fissure seen from below, from a human embryo of about four weeks. (Optic stalk labeled at center left.) | |
| Latin | pedunculus opticus |
| Gray's | subject #224 1001 |
| Carnegie stage | 14 |
| Code | TE E5.14.3.4.2.2.6 |
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.
Closure of the choroid fissure in the optic stalk occurs during the seventh week of development. The former optic stalk is then called the optic nerve.[1] The Bottom Line: the optic stalks are the structures that precede the optic nerves embryologically.
References
- ^ Kaplan Qbook - USMLE Step 1 - 5th edition - page 55
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