Optic nerve

High school (ages 12+)
Human Body

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/optic-nerve

1. What is the scientific designation?
2. What is the axon count?
3. What is the optic nerve and why is it important?
4. How does the optic nerve carry information from both sides of your eyes to the right parts of your brain?

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the scientific designation?Cranial nerve II (CN II)
2. What is the axon count?Approximately 1.2 million retinal ganglion cell axons
3. What is the optic nerve and why is it important?The optic nerve is a bundle of about 1.2 million tiny fibers that carry pictures from your eyes to your brain. It lets you see and understand what you look at.
4. How does the optic nerve carry information from both sides of your eyes to the right parts of your brain?At the optic chiasma, fibers from the inner half of each eye cross to the opposite side, while fibers from the outer half stay on the same side. This arrangement sends the left side of your vision to the right side of your brain and vice versa.

Retinal Ganglion Cell Axons: The nerve fibers extending from retinal ganglion cells that form the optic nerve.
Optic Chiasma Decussation: The partial crossing over of optic nerve fibers at the chiasma, linking hemispheres to visual fields.
Lateral Geniculate Nucleus (LGN): A thalamic nucleus that relays visual information to the visual cortex.
Superior Colliculus: A midbrain structure involved in visual reflexes and eye movement control.