Dennis has lost the ability to voluntarily raise his left arm due to damage to his spinal cord and associated nerves. Which of the following is a possible explanation for Dennis's symptom?
A) One or more ventral roots in the cervical region of the spinal cord have been damaged.
B) One or more dorsal roots in the cervical region of the spinal cord have been damaged.
C) One or more ventral roots in the thoracic region of the spinal cord have been damaged.
D) One or more dorsal roots in the thoracic region of the spinal cord have been damaged.

Question

Quizplus · Accepted Answer

The ventral roots of the spinal cord carry motor information from the brain to the muscles, enabling voluntary movements. Damage to the ventral roots in the cervical region, which innervates the arms, would impair Dennis's ability to raise his arm.

Dennis Has Lost the Ability to Voluntarily Raise His Left