Optic Disk

**Definition:** The portion of the optic nerve seen in the fundus with the ophthalmoscope. It is formed by the meeting of all the retinal ganglion cell axons as they enter the optic nerve.

**Tree numbers:** - A08.800.800.120.680.660 - A09.371.729.690

**Synonyms:** - Optic Disc - Optic Nerve Head - Optic Papilla