In a sheep brain, what is the primary function of the cerebral peduncles?

• A. They serve as the main relay center for sensory information to the cortex.
• B. They regulate hormone secretion from the pituitary gland.
• C. They produce cerebrospinal fluid within the ventricles.
• D. They connect the cerebrum to the spinal cord and transmit motor signals.

Answer: (D)

Verified step by step guidance

1. Understand the anatomy of the cerebral peduncles: The cerebral peduncles are located in the midbrain and are part of the brainstem. They consist of large bundles of nerve fibers that connect the cerebrum to the lower parts of the brain and spinal cord.
2. Identify the primary function of the cerebral peduncles: Their main role is to transmit motor signals from the cerebral cortex to the spinal cord, facilitating voluntary movement.
3. Eliminate incorrect options: Review the provided choices and rule out options that do not align with the anatomical function of the cerebral peduncles. For example, they are not involved in hormone secretion or cerebrospinal fluid production.
4. Focus on the correct answer: The cerebral peduncles serve as a pathway for motor signals, connecting the cerebrum to the spinal cord. This is essential for coordinating motor control.
5. Relate the function to the broader context: Consider how the cerebral peduncles fit into the overall structure and function of the central nervous system, emphasizing their role in motor signal transmission and integration.