Optic stalk

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]

Optic stalk
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.)
Details
Carnegie stage	14
Identifiers
Latin	pedunculus opticus
TE	stalk_by_E5.14.3.4.2.2.6 E5.14.3.4.2.2.6
Anatomical terminology [edit on Wikidata]

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 nerve.^[3] In short, the optic stalks are the structures that precede the optic nerves embryologically.