porus opticus

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 [por´us] (L.)
porus acus´ticus exter´nus the outer end of the external acoustic meatus.
porus acus´ticus inter´nus the opening of the internal acoustic meatus in the cranial cavity.
porus op´ticus the opening in the sclera for passage of the optic nerve.

op·tic disc

an oval area of the ocular fundus devoid of light receptors where the axons of the retinal ganglion cell converge to form the optic nerve head;

porus opticus

(1) Cribriform lamina of sclera (lamina cribrosa sclerae [NA6]); perforated layer of sclera.
(2) Optic disk (see there); discus nervi optici [NA6].