Lens capsule has which type of collagen ?
**Core Concept**
The lens capsule, a transparent membrane surrounding the lens in the eye, is composed of a unique type of collagen. Collagens are a family of structural proteins that provide strength and elasticity to various connective tissues in the body.
**Why the Correct Answer is Right**
The lens capsule is primarily composed of **Type IV collagen**, which is a network-forming collagen that provides a strong and flexible framework for the lens. Type IV collagen is a crucial component of basement membranes, including the lens capsule, where it helps maintain the lens's transparency and integrity. The unique structure of Type IV collagen allows it to form a network that is resistant to mechanical stress and maintains the lens's shape.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Type I collagen is a fibril-forming collagen, primarily found in skin, bones, and tendons, and is not associated with the lens capsule.
**Option B:** This option is incorrect because Type II collagen is found in cartilage, which does not have a direct relationship with the lens capsule.
**Option C:** This option is incorrect because Type III collagen is a reticular collagen, found in blood vessels and other connective tissues, and is not the primary collagen in the lens capsule.
**Clinical Pearl / High-Yield Fact**
Remember that the lens capsule is composed of Type IV collagen, which is a characteristic feature of basement membranes. This knowledge is essential for understanding the pathophysiology of cataract formation and the surgical approaches to remove the lens capsule.
**Correct Answer: C. Type IV collagen.**