Question

There are three layers of neurons in the retina. The axons of which of these neuron layers form the optic nerves?

Answer 1

Answer:

Layer of ganglion cells

Explanation:

Retina constitute the nervous coat/layer of the eye. Retina is further divided into ten layers. These layers from outermost to innermost are:

1. Retinal pigment epithelium

This is the outermost layer and is composed of hexagonal cells containing the pigment melanin.

2. Photoreceptor layer i.e. layers of rods and cons

This layer contains the rods and cones which are end organs of visual reception.

3. External Limiting membrane

This layer lies between layer of rods and cones and outer nuclear layer.

4. Outer Nuclear layer

This layer contains the nuclei of rods and cones.

5. Outer plexiform layer

This layer is characterized by the synapses of axons of photoreceptors and dendrites of bipolar cells.

6. Inner Nuclear layer

This layer contains the nuclei of bipolar cells.

7. Inner plexiform layer

This layer is characterized by the synapses of axons of bipolar cells and dendrites of ganglion cells.

8. Ganglion cell layer/ Layer of ganglion cells

This layer contains the nuclei of ganglion cells.

9. Nerve fiber layer

This layer contains the axons of ganglion cells. These axons form the fibers of optic nerve which is cranial nerve II.

10. Inner limiting membrane

This is the innermost layer of retina and lies next to the vitreous body. Vitreous body is a transparent, avascular jelly-like substance which occupies the posterior chamber of the eye.

ANSWER:

Axons of layer of ganglion cells form the optic nerves.

The three layers of neurons in retina are:

1. Outer Nuclear Layer
2. Inner Nuclear Layer
3. Ganglion cell Layer