Anterior horn of lateral ventricle is closed anteriorly by –
**Core Concept**
The anterior horn of the lateral ventricle is a part of the cerebral ventricular system, which is a crucial aspect of the brain's structure and function. The lateral ventricles are divided into several horns, including the anterior horn, which is located in the frontal lobe.
**Why the Correct Answer is Right**
The anterior horn of the lateral ventricle is closed anteriorly by the **lamina terminalis**, a thin layer of tissue that separates the anterior horn from the frontal lobe. The lamina terminalis is a critical structure that forms part of the anterior wall of the third ventricle and helps to regulate the cerebrospinal fluid (CSF) circulation within the ventricular system. The lamina terminalis is formed by the fusion of the two olfactory tracts and the anterior commissure.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the anatomy of the lateral ventricle.
**Option B:** The foramen of Monro is an opening between the lateral ventricle and the third ventricle, not a structure that closes the anterior horn.
**Option C:** The corpus callosum is a structure that connects the two hemispheres of the brain, but it does not close the anterior horn of the lateral ventricle.
**Clinical Pearl / High-Yield Fact**
The lamina terminalis is a critical structure to identify during neurosurgical procedures, as damage to this area can lead to CSF leakage and other complications.
**Correct Answer: D. Lamina terminalis**