Optic stalk

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.)
Carnegie stage 14
Latin pedunculus opticus
Code TE E5.

Anatomical terminology

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.


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

  1. Kaplan Qbook - USMLE Step 1 - 5th edition - page 55

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