. A 32-year-old man has trouble tying his shoelaces, writing, and walking in a straight line. A computed

tomographic (special x-ray) scan of the brain would likely reveal that the man has an abnormality in the
A. cerebellum.
B. brain stem.
C. diencephalon.
D. cerebrum.

cerebrum

That is wrong. I just took my exam and it is incorrect.

To determine the correct answer, we can go through each option and analyze its role in the functions described in the question.

A. Cerebellum: The cerebellum is responsible for coordination and motor control. It helps in activities such as tying shoelaces, writing, and maintaining balance while walking. Damage or abnormality in the cerebellum can lead to difficulty performing these tasks.

B. Brain stem: The brain stem is involved in basic life functions like breathing, heart rate, and consciousness. While abnormalities in the brain stem can cause various symptoms, they may not specifically result in the difficulties mentioned in the question.

C. Diencephalon: The diencephalon includes structures such as the thalamus and hypothalamus, which play roles in sensory processing and regulating homeostasis. While it has some influence on movement, it is not directly related to the fine motor skills and coordination described in the question.

D. Cerebrum: The cerebrum is the largest part of the brain and is responsible for higher-level cognitive functions, including motor control, sensation, and thinking. Different lobes of the cerebrum are involved in specific tasks, such as the parietal lobe for coordination and the occipital lobe for visual processing.

Based on the symptoms described, the most likely answer is A. cerebellum. The cerebellum is primarily responsible for the coordination of movement and motor skills, making it the most relevant option in this case.

Therefore, the correct answer is A. cerebellum.