Question

Vascular tunics of eye ball is comprised of
A. Choroid
B. Ciliary body
C. Iris
D. Retina
Choose the correct answer from the options given below:

• A. A, B and D only
• B. A, C and D only
• C. A, B and C only
• D. B, D and C only

Hint:

Remember that the vascular tunic is also known as the "uveal tract" or "uvea" and is composed of the iris, ciliary body, and choroid (from anterior to posterior).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The wall of the eyeball is structurally organized into three concentric anatomical layers or tunics: the outer fibrous tunic, the middle vascular tunic, and the inner nervous tunic.

Step 2: Detailed Explanation:
Let us categorize the listed parts of the eye into their respective tunics:
1. Fibrous Tunic (outermost layer): Composed of the sclera and cornea. It provides structural support and protection.
2. Vascular Tunic Uvea (middle layer): Highly vascularized and pigmented. It is comprised of three continuous parts:
- A. Choroid: The posterior vascular layer lining the sclera.
- B. Ciliary body: The thickened middle portion that controls the lens shape and secretes aqueous humor.
- C. Iris: The anterior colored diaphragm regulating the pupil's diameter.
3. Nervous Tunic (innermost layer): Comprised of the Retina (D), which contains the light-sensitive photoreceptors.
Therefore, the vascular tunic comprises the choroid, ciliary body, and iris (A, B, and C only).

Step 3: Final Answer
The correct option is (C).