Question

Movement of the right hand flexors will follow which pathway?

A. Right side of the cerebral cortex, medial white matter of spinal cord, lower motor neuron in medial ventral horn, hand flexors.
B. Left side of cerebral cortex, lateral white matter of spinal cord, lower motor neurons in lateral ventral horn, hand flexors.
C. Left side upper motor neurons in brainstem, medial white mater of spinal cord, lower motor neurons in medial ventral horn, hand flexors.
D. Right side upper motor neurons in brainstem, medial white matter of spinal cord, lower motor neurons in medial ventral horn, hand flexors.
E. Left side of cerebral cortex, medial white matter of spinal cord, lower motor neurons in medial ventral horns, hand flexors.

Answer 1

The correct pathway for the movement of the right hand flexors is initiated from the left side of the cerebral cortex, with signals traveling down the lateral white matter of the spinal cord, then to the lateral ventral horn where they synapse with lower motor neurons that control the hand flexors.

Step-by-step explanation:

The movement of the right hand flexors will follow which pathway? The correct pathway is B: Left side of cerebral cortex, lateral white matter of spinal cord, lower motor neurons in lateral ventral horn, hand flexors. This is because the motor commands from the primary motor cortex of the cerebrum control muscles on the opposite side of the body due to the crossing over (decussation) of the majority of the corticospinal tract fibers at the level of the medulla.

They then pass down in the lateral column of the spinal cord and synapse on lower motor neurons in the ventral horn which are responsible for movement of the limbs, including the hand flexors.