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 ventral roots in the thoracic region of the spinal cord have been damaged.
C. One or more dorsal roots in the thoracic region of the spinal cord have been damaged.
D. One or more dorsal roots in the cervical region of the spinal cord have been damaged.
Answer: A
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