The first center that gets activated for voluntary skilled movments is:
**Core Concept**
The motor control of voluntary skilled movements involves a complex neural circuitry that includes the primary motor cortex, basal ganglia, and cerebellum. The first center to get activated for such movements is the primary motor cortex, which is responsible for transmitting signals to the spinal cord and ultimately to the muscles involved in the movement.
**Why the Correct Answer is Right**
The primary motor cortex is the primary center for motor control, and it is activated first for voluntary skilled movements. This is because the primary motor cortex contains large pyramidal neurons that are responsible for transmitting signals to the spinal cord and the muscles involved in the movement. The primary motor cortex also receives input from the sensory cortex, which helps in coordinating the movement with sensory feedback. The activation of the primary motor cortex triggers a cascade of events that ultimately leads to the execution of the voluntary movement.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the primary motor cortex is the first center to get activated for voluntary skilled movements, not the basal ganglia. The basal ganglia are involved in the regulation of voluntary movements, but they are not the primary center for motor control.
* **Option B:** This option is incorrect because the cerebellum is involved in the coordination and regulation of movements, but it is not the first center to get activated for voluntary skilled movements. The cerebellum plays a crucial role in the learning and refinement of motor skills, but it is not the primary center for motor control.
* **Option C:** This option is incorrect because the sensory cortex is involved in the processing of sensory information, but it is not the first center to get activated for voluntary skilled movements. The sensory cortex provides feedback to the primary motor cortex, which helps in coordinating the movement, but it is not the primary center for motor control.
**Clinical Pearl / High-Yield Fact**
The primary motor cortex is responsible for transmitting signals to the spinal cord and ultimately to the muscles involved in the movement. This is why lesions to the primary motor cortex can result in weakness or paralysis of the affected muscles.
**Correct Answer:** D.