Question

based on the motor homunculus, which of the following body regions has the fewest number of motor units involved?
back trunk
tongue
face
hands

Explanation:

The motor homunculus is a representation of the body in the primary motor cortex. Body regions that require fine - motor control (like the hands, face, and tongue) have a larger number of motor units. The back trunk is involved in gross movements and has fewer motor units compared to the other options.

Answer:

back trunk