**Question:** Absence of Corpus callosum leads to

A. Seizures
B. Cognitive impairment
C. Dysarthria and dysphagia
D. Hypotonia and delayed milestones

**Correct Answer:** B. Cognitive impairment

**Core Concept:**
The Corpus callosum is a large bundle of nerve fibers that connects the two cerebral hemispheres in the brain. It plays a crucial role in communication and integration of information between the left and right hemispheres, facilitating tasks such as language, spatial awareness, and motor coordination.

**Why the Correct Answer is Right:**
In the absence of the Corpus callosum, there is a disruption in the communication between the two cerebral hemispheres. This leads to impaired integration of sensory, motor, and cognitive information. As a result, cognitive functions such as language, spatial awareness, and executive functions are affected, leading to cognitive impairment.

**Why Each Wrong Option is Incorrect:**
A. Seizures: Absence of the Corpus callosum does not directly cause seizures. Seizures are typically caused by structural or electrical abnormalities in the brain.

B. Hypotonia and delayed milestones: While the Corpus callosum plays a role in motor coordination, the absence of the corpus callosum does not solely cause hypotonia and delayed milestones. Other factors such as genetic, developmental, or neurological abnormalities can contribute to these symptoms, making this option partially correct but not the whole explanation.

C. Dysarthria and dysphagia: While the Corpus callosum is involved in speech and swallowing functions, the absence of the corpus callosum does not exclusively cause dysarthria and dysphagia. These symptoms may result from the combined effects of cognitive impairment, motor coordination problems, and other neurological abnormalities.

D. Hypotonia and delayed milestones: As mentioned earlier, the absence of the corpus callosum does not solely cause hypotonia and delayed milestones. Other factors contribute to these symptoms, making this option partially correct but not the whole explanation.

**Clinical Pearl:**
The Corpus callosum is an essential part of the human brain, contributing to cognitive, motor, and speech functions. The absence of the corpus callosum can lead to a complex set of symptoms, including cognitive impairment, motor coordination problems, and speech difficulties. These symptoms result from the disruption of information integration between the two hemispheres of the brain. However, the absence of the corpus callosum is typically associated with other underlying neurological abnormalities that contribute to the observed clinical manifestations.