Reciprocal arm assembly is placed at
**Core Concept**
Reciprocal arm assembly is a component of the extracellular matrix in the eye, specifically in the region of the ciliary body. It plays a crucial role in the regulation of aqueous humor outflow and intraocular pressure.
**Why the Correct Answer is Right**
The reciprocal arm assembly is a component of the trabecular meshwork, which is the primary site of aqueous humor outflow in the eye. The reciprocal arm assembly interacts with the uveal meshwork and the juxtacanalicular tissue to facilitate the drainage of aqueous humor from the eye. This process helps to regulate intraocular pressure and maintain a healthy eye.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because the reciprocal arm assembly is not a component of the sclera.
**Option B:** This is incorrect because the reciprocal arm assembly is not a component of the choroid.
**Option C:** This is incorrect because the reciprocal arm assembly is not a component of the iris.
**Clinical Pearl / High-Yield Fact**
The reciprocal arm assembly is an important component of the trabecular meshwork, and its dysfunction can contribute to the development of glaucoma. Glaucoma is a group of eye conditions that can lead to vision loss and blindness if left untreated.
**Correct Answer: C. The trabecular meshwork.**