What is nervus Opticus?
What is nervus Opticus?
[op´tik] ocular (def. 1). optic nerve the second cranial nerve; it is purely sensory and is concerned with carrying impulses for the sense of sight (see vision).
What structures are in the optic disc?
Anatomical terminology The optic disc or optic nerve head is the point of exit for ganglion cell axons leaving the eye. Because there are no rods or cones overlying the optic disc, it corresponds to a small blind spot in each eye. The ganglion cell axons form the optic nerve after they leave the eye.
What is optic nerve papilla?
Medical Definition of optic papilla : a slight elevation that is nearly coextensive with the optic disk and is produced by the thick bundles of the fibers of the optic nerve in entering the eyeball.
What describes the optic disc?
Optic disc: The circular area in the back of the inside of the eye where the optic nerve connects to the retina. Also called the optic nerve head.
Do you have two optic nerves?
The two optic nerves meet at the optic chiasm. There, the optic nerve from each eye divides, and half of the nerve fibers from each side cross to the other side.
What is retina in simple words?
Retina: The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain. There is a small area, called the macula, in the retina that contains special light-sensitive cells.
What kills the optic nerve?
In glaucoma, researchers believe that the ganglion cells of the retina, as well as the support cells within the optic nerve, can die for various reasons. Some possible reasons include excessive fluid pressure within the eye, lack of blood flow or oxygen, or naturally occurring toxins within the eye.
Where does the discus nervi optici take place?
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; discus nervi optici. See optic disc.
How is the optic disc related to the optic nerve?
Optic disc. Because there are no rods or cones overlying the optic disc, it corresponds to a small blind spot in each eye. The ganglion cell axons form the optic nerve after they leave the eye. The optic disc represents the beginning of the optic nerve and is the point where the axons of retinal ganglion cells come together.
What is the medical term for optic disc drusen?
It is useful for finding evidence corroborating the diagnosis of glaucoma and other optic neuropathies, optic neuritis, anterior ischemic optic neuropathy or papilledema (i.e. optic disc swelling produced by raised intracranial pressure ), and optic disc drusen .
Are there any other problems with the optic nerve?
Other optic nerve problems are less common. Optic nerve hypoplasia is the underdevelopment of the optic nerve resulting in little to no vision in the affected eye.