Corneal layer responsible for deturgescence –
**Core Concept**
The cornea is the transparent outer layer of the eye, and its maintenance is crucial for clear vision. The process of deturgescence refers to the removal of excess fluid from the cornea, which is essential for maintaining its transparency. This process is primarily governed by the **corneal endothelium**.
**Why the Correct Answer is Right**
The **corneal endothelium** plays a critical role in deturgescence by pumping out excess fluid from the corneal stroma, thereby maintaining the cornea's dehydration state. This is achieved through the **Na+/K+ ATPase pump** and **aquaporin water channels**, which help regulate fluid and electrolyte balance across the endothelial layer.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the epithelium, while important for the cornea's barrier function, does not primarily regulate deturgescence.
**Option B:** This is also incorrect as Bowman's layer is an acellular layer that does not have the capability to pump out fluids.
**Option D:** Similarly, this option is incorrect because the stroma, although it contains most of the cornea's water, relies on the endothelium for fluid regulation.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that dysfunction of the **corneal endothelium** can lead to corneal edema, which impairs vision. This can occur due to various factors, including **Fuchs' endothelial dystrophy** or following intraocular surgery.
**Correct Answer:** D. Corneal endothelium