Question

activity 17: quiz
module: nervous
topic: structures / type: combination

what structure is highlighted?

a. posterior chamber
b. optic n. (cn ii)
c. retina
d. corneoscleral junction
e. lens

Explanation:

Identify the highlighted structure

Using the Eye Anatomy knowledge point

The provided histological cross-section of the eye shows several structures highlighted in different colors:

• The outer fibrous layer (cornea and sclera) is highlighted in blue.
• The ciliary body/iris region is highlighted in green.
• The structure highlighted in bright red is the biconvex, transparent structure situated behind the iris, which is the lens.

Evaluate the given options

• A. Posterior chamber: This is the narrow space filled with aqueous humor behind the iris and in front of the lens (not highlighted in red).
• B. Optic n. (CN II): This is the nerve exiting the posterior aspect of the eye (highlighted in purple/blue on the right).
• C. Retina: This is the inner neural layer lining the back of the eye (not highlighted in red).
• D. Corneoscleral junction: This is the transition zone between the cornea and sclera (not highlighted in red).
• E. Lens: This matches the biconvex structure highlighted in bright red in the anterior segment of the eye.

Answer:

• (A) Posterior chamber
• (B) Optic n. (CN II)
• (C) Retina
• (D) Corneoscleral junction
• (E) Lens (Correct answer)