|Transverse section of head of chick embryo of fifty-two hours’ incubation.|
|Optic cup and choroidal fissure seen from below, from a human embryo of about four weeks. (Optic stalk labeled at center left.)|
|Gray's||subject #224 1001|
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.
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