The crystalline lens derived its nutrition from
**Core Concept**
The crystalline lens in the eye obtains its nutrients through a specific mechanism that involves the anterior and posterior capsule. The lens is avascular, meaning it lacks blood vessels, and therefore relies on diffusion and the aqueous and vitreous humors for nutrient supply.
**Why the Correct Answer is Right**
The lens receives its nutrients primarily from the aqueous humor, which is the clear fluid in the anterior and posterior chambers of the eye. The aqueous humor diffuses through the lens capsule to supply the lens with oxygen, glucose, and other essential nutrients. This process is crucial for maintaining the transparency and function of the lens. The lens also receives some nutrients from the vitreous humor, which is the gel-like substance that fills the posterior chamber.
**Why Each Wrong Option is Incorrect**
**Option A:** The lens does not receive significant nutrients from the aqueous humor alone, so this option is incomplete.
**Option B:** The lens does not have a direct blood supply, so this option is incorrect.
**Option C:** The lens capsule is a barrier that prevents the lens from receiving direct nutrients from the aqueous humor, so this option is incorrect.
**Clinical Pearl / High-Yield Fact**
The avascularity of the lens is a unique characteristic that distinguishes it from other tissues in the body. This characteristic is essential for maintaining the transparency and function of the lens, which is critical for vision.
**Correct Answer:** A. The crystalline lens derived its nutrition primarily from the aqueous humor.