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<unk> . Closure of the choroidal fissure in the<unk>  occurs during the seventh week of development. The former<unk>  is then called the optic nerve. In short, the<unk> s are the structures that precede the optic nerves embryologically.
Optic stalk
Optic vesicle
Optic pit
Syrinx 
Optician
Optic recess
Optic cup 
Barrel cortex