Question

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

what structure is highlighted?

a. optic disc
b. choroid
c. posterior cavity
d. iris
e. lens

attempt: 1/1
question 6/25
correct 5
score 20%

Explanation:

Identify the highlighted structure

Using the Eye Anatomy and Ocular Histology knowledge points

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

• The lens is highlighted in red.
• The sclera/cornea outer layer is highlighted in blue.
• The retina is highlighted in green.
• The choroid (vascular layer) is highlighted in pink/magenta.
• The optic disc/optic nerve region is highlighted in purple at the posterior pole.

Looking closely at the image, the pink/magenta line running between the outer blue layer (sclera) and the inner green layer (retina) is the highlighted structure. This middle vascular layer of the eye is the choroid.

Match with the options

Using the Eye Anatomy knowledge point

• A. Optic disc: This is highlighted in purple at the exit point of the optic nerve.
• B. Choroid: This is the middle vascular layer, highlighted in pink/magenta.
• C. Posterior cavity: This is the large space behind the lens, which is not highlighted.
• D. Iris: This is the anterior continuation of the vascular tunic, not highlighted here.
• E. Lens: This is highlighted in red.

Therefore, the highlighted structure in pink/magenta is the choroid.

Answer:

• (A) Optic disc
• (B) Choroid (Correct answer)
• (C) Posterior cavity
• (D) Iris
• (E) Lens