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

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:

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.  

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