Where does the optic nerve exit from the eye?

At the optic disc, the optic nerve fibers exit the eye through fenestrations within the sclera, termed the lamina cribrosa.

What is the name of the spot where axons exit the eye to form the optic nerve quizlet?

Ganglion cells form the optic nerve which exits at the back of the eye at the blind spot.

Where does the optic nerve start and where does it end?

When the nerve emerges from the back of the eye, it passes through the remainder of the posterior orbit (eye socket) and through the bony optic canal to emerge intracranially on the underside of the front of the brain.

Which axons form the optic nerve?

The optic nerve (ON) is constituted by the axons of the retinal ganglion cells (RGCs). These axons are distributed in an organized pattern from the soma of the RGC to the lateral geniculated nucleus (where most of the neurons synapse). The key points of the ON are the optic nerve head and chiasm.

Where do the cranial nerves exit the brainstem?

Structure. The glossopharyngeal nerve is the ninth of 12 pairs of cranial nerves. It exits the brainstem out from the sides of the upper medulla, just rostral (closer to the nose) to the vagus nerve.

What is the position of the optic nerve?

Made of nerve cells, the optic nerve is located in the back of the eye. Also known as the second cranial nerve or cranial nerve II, it is the second of several pairs of cranial nerves.

What is the name of the spot where axons exit the eye?

The optic disc (optic nerve head) is the location where ganglion cell axons exit the eye to form the optic nerve. There are no light sensitive rods or cones to respond to a light stimulus at this point. This causes a break in the visual field called “the blind spot” or the “physiological blind spot”.

How do axons leave the retina?

Ganglion cell axons exit the retina through a circular region in its nasal part called the optic disk (or optic papilla), where they bundle together to form the optic nerve.

Where does the oculomotor nerve exit the skull?

The oculomotor nerve exits the brainstem near midline at the base of the midbrain just caudal to the mammillary bodies. It passes through the cavernous sinus and proceeds through the supraorbital fissure to reach the orbit of the eye (Figure 1). The third cranial nerve has both somatic and autonomic fibers.

Where does the optic nerve exit the skull?

optic chiasm
The optic nerve travels through the optic canal, partially decussates in the optic chiasm, and terminates in the lateral geniculate nucleus where information is transmitted to the visual cortex.

Where do most of the axons from the optic nerve go?

Most of the axons of the optic nerve terminate in the lateral geniculate nucleus from where information is relayed to the visual cortex. Its diameter increases from about 1.6 mm within the eye, to 3.5 mm in the orbit to 4.5 mm within the cranial space.

Where are the axons of the optic nerve located?

The optic nerve is mainly made up of the axons (nerve fibers) of the retinal ganglion cells from the retina. The optic disc or nerve head is the point where the axons from the retinal ganglion cells leave the eye.

Where does the optic nerve leave the eye?

The optic disc or nerve head is the point where the axons from the retinal ganglion cells leave the eye. The nerve head appears as a white circular structure in the back of the eye. There are no photoreceptors on this structure. As a result, humans have a natural blind spot. 1 

What happens to the nerve cells in the retina?

The human retina is a delicate organization of neurons, glia and nourishing blood vessels. In some eye diseases, the retina becomes damaged or compromised, and degenerative changes set in that eventally lead to serious damage to the nerve cells that carry the vital mesages about the visual image to the brain.

Where does visual input from the left eye go?

At the point of the decussation, the fibers that originated from the nasal field of the left eye, cross over and enter the right optic tract. Therefore, visual input from the left visual field travels in the right optic tract.