Optic CN II

Question 1

What is the fiber type of optic n.?

Answer 1

Special Sensory Afferent

Question 2

Is optic nerve derived from branchial arch?

Answer 2

YES

Question 3

Which cell body is located in the retina?

Answer 3

Ganglion neurons

Question 4

The axons converge and leave the back of the eye as the _____.

Answer 4

Optic nerve

Question 5

Does the optic nerve consist of myelinated fibers?

Answer 5

YES

Question 6

What are the myelinated fibers surrounded by?

Answer 6

Meninges

Question 7

The _____ artery and vein lies _____ of the nerve.

Answer 7

Central; anterior

Question 8

How can the venous blood flow be disrupted?

Answer 8

Increased CSF pressure in the subarachnoid space

Question 9

Increased CSF pressure int he subarachnoid space can disrupt venous blood flow and cause _____.

Answer 9

Papilledema

Question 10

Optic nerve passes through the _____into the cranial cavity.

Answer 10

Optic canal

Question 11

Fibers from the nasal half of each retina crosses the _____ and enters _____.

Answer 11

Optic chiasm; optic tract

Question 12

What is the COMPLETE pathway of optic nerve to get to the FINAL synpase destination?

Answer 12

Axons of the ganglion nucleus will converge into optic nerve. The nerve will then travels posteriorly, through the optic canal into the cranial cavity. The nasal optic nerve fibers will then cross optic chiasm to enter optic tract, and temporal optic nerve will ipsilaterally enter the optic tract. The fiber continue to the ‘lateral geniculate body/nucleus’ of the thalamus where they synapse. The lateral geniculate body will form the ‘geniculocalcarien tract’ and project to the primary visual cortex located immediately above (cuneus) and below (lingual gyrus) the calcarine sulcus. Some fibers loop anteriorly around the temporal horn of the lateral ventricle (Meyer’s loop), continue through the temporal lobe and synapse below the sulcus.

Question 13

Lateral geniculate body/nucleus forms _____ is also known as?

Answer 13

Geniculocalcarine tract; Optic radiation

Question 14

What is located immediately above the calcarine sulcus?

Answer 14

Cuneus

Question 15

What is located immediately below the calcarine sulcus?

Answer 15

Lingual gyrus

Question 16

Some fibers loop anteriorly around the ______. What is the loop called?

Answer 16

Temporal horns of the lateral ventricle; Meyer’s loop

Question 17

The fibers that course through the parietal lobe and synapse above the sulcus are transmitting data from a visual target located in the _____ visual field.

Answer 17

Upper

Question 18

The fibers that loop anteriorly around the temporal horn of the lateral ventricle (Meyer’s loop), continue through the temporal lobe and synapse _____. These fibers are transmitting data fro a visual target located in the _____.

Answer 18

Below the sulcus; upper eyefield

Question 19

Some fibers leave the optic tract and terminate in the _____ and _____.

Answer 19

Superior colliculus and pretectum

Question 20

Sequence: Light entering the eyes from the left visual field will focus on the _____ of the left eye, _____ of the right eye. The information from both of these areas will subsequently project to the _____ optic tract, to the right geniculate body, ultimately the _____ visual cortex.

Answer 20

Nasal retina; Temporal retina; Right; Right

Question 21

What does the optic nerve exit through?

Answer 21

Optic foramen

Question 22

The cell bodies of optic nerve are in the _____ located in the _____.

Answer 22

Ganglion neurons; Retina

Question 23

The 2nd nucleus is called the _____ (optic tract) which is located in the _____.

Answer 23

Lateral geniculate body