Optic Disc

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** A portion of the retina at which the axons of the ganglion cells exit the eyeball to form the optic nerve. No light-sensitive photoreceptors are contained within this portion of the retina.

**Synonyms:** - OPTIC DISC - Optic Disk - Optic Nerve Head - Optic Nerve Head - Optic Papilla