Damage to the ventral roots of the first five thoracic spinal nerves on the right side of the body would interfere with the ability to
A) constrict the left pupil.
B) dilate the right pupil.
C) constrict the right pupil.
D) smile and frown.
E) dilate the left pupil.

Question

Quizplus · Accepted Answer

The ventral roots of the thoracic spinal nerves contain motor fibers. Damage to these roots would affect motor functions, such as the ability to dilate the right pupil, which involves sympathetic innervation originating from the thoracic spinal cord.

Damage to the Ventral Roots of the First Five Thoracic