Definition of demurrer 1: a response in a court proceeding in which the defendant does not dispute the truth of the allegation but claims it is not sufficient grounds to justify legal action 2: objection
blind spot. The beginning of the optic nerve in the retina is called the optic nerve head or optic disc. Since there are no photoreceptors (cones and rods) in the optic nerve head, this area of the retina cannot respond to light stimulation.As a result, it is known as the blind spot, and everybody has one in each eye.he beginning of the optic nerve in the retina is called the optic nerve head or optic disc. Since there are no photoreceptors (cones and rods) in the optic nerve head, this area of the retina cannot respond to light stimulation.
When the eye is open, light hits the retina and initiates nerve impulses that travel along the optic nerves to the visual centers of the brain. The spot on the retina where the optic nerve leaves the eye is called the optic disc.hen the eye is open, light hits the retina and initiates nerve impulses that travel along the optic nerves to the visual centers of the brain. The spot on the retina where the optic nerve leaves the eye is called the optic disc.