Question

what structure is highlighted?

a. optic tract
b. posterior cavity
c. posterior chamber
d. sclera
e. optic n. (cn ii)

Explanation:

Identify highlighted structure

Using the Eye Anatomy and Neural Components knowledge points

• The 3D anatomical model shows a lateral/sagittal view of the right orbit.
• The eyeball (bulbus oculi) is situated anteriorly.
• Extending posteriorly from the back of the eyeball through the optic canal is a prominent, thick nerve highlighted in bright green.
• This structure is the optic nerve, also known as Cranial Nerve II (CN II).

Evaluate the options

• A. Optic tract: The optic tract is located posterior to the optic chiasm inside the cranial cavity, not within the orbit.
• B. Posterior cavity: This refers to the vitreous chamber inside the eyeball itself.
• C. Posterior chamber: This is a small space inside the eye between the iris and the lens.
• D. Sclera: This is the white outer layer of the eyeball, not the nerve extending behind it.
• E. Optic n. (CN II): This correctly identifies the highlighted cranial nerve exiting the posterior aspect of the eye.

Answer:

• (A) Optic tract
• (B) Posterior cavity
• (C) Posterior chamber
• (D) Sclera
• (E) Optic n. (CN II) (Correct answer)