When a person displays a "startle response," in which reflexive changes in the position of the head, neck, and upper limbs occur in response to bright lights, sudden movements or loud noises, which of the following regions is responsible?
A) vestibular nuclei
B) reticulospinal tracts
C) cerebral nuclei
D) rubrospinal tracts
E) tectospinal tracts

Question

Quizplus · Accepted Answer

The tectospinal tracts are responsible for the startle response, which involves reflexive changes in the position of the head, neck, and upper limbs in response to bright lights, sudden movements, or loud noises. The tectospinal tracts are part of the midbrain and receive sensory input from the eyes, ears, and skin receptors. They transmit signals to the spinal cord, which activate motor neurons and cause the reflexive movements.

When a Person Displays a "Startle Response," in Which Reflexive