How many neurons are used for motor control with the somatic system? A. Four B. Two C. Three D. One

To determine how many neurons are used for motor control in the somatic nervous system, we need to consider the basic structure of the motor pathways.

Breakdown of the Problem

1. Identify the types of neurons in the somatic motor system.
2. Understand the organization of the motor pathway.

Relevant Concepts

• The somatic nervous system typically involves a two-neuron pathway for motor control:
  1. Upper Motor Neurons: Located in the brain, these neurons originate in the motor cortex.
  2. Lower Motor Neurons: Located in the spinal cord or brainstem, these neurons innervate the skeletal muscles.

Analysis and Detail

1. Upper Motor Neurons (1)
   • They send signals from the central nervous system to the lower motor neurons.
2. Lower Motor Neurons (1)
   • They transmit the signals from the spinal cord to the muscles.

Thus, the motor control in the somatic system utilizes a minimum of two neurons.

Verify and Summarize

• The somatic motor pathway consists of one upper motor neuron and one lower motor neuron, confirming that the answer is two neurons.

Final Answer

B. Two