Final answer:
The correct answer for the major targets of corticospinal projections in the brainstem and spinal cord is C) Spinal cord and medulla. The corticospinal tracts primary targets include the spinal cord, where it influences motor activity, and the medulla oblongata, which contributes to the control of autonomous functions.
Step-by-step explanation:
Major Targets of Corticospinal Projections
The major brainstem and spinal cord targets of corticospinal projections are not the hippocampus, cerebellum, cerebral cortex, thalamus, hypothalamus, or amygdala. The correct answer to the question of brainstem and spinal cord targets of corticospinal projections is: C) Spinal cord and medulla. The corticospinal tract is a collection of axons that travel between the cerebral cortex and the spinal cord. Its primary targets are the spinal cord, where it innervates lower motor neurons, and the brainstem, particularly the medulla oblongata which is involved in autonomic functions and the coordination of movement.
The cerebellum is not a direct target of corticospinal projections; rather, it receives input indirectly via pons from the cerebral cortex and provides feedback to the motor cortex to coordinate and refine movements. The hypothalamus and amygdala are parts of the limbic system and are not directly involved with motor control.