ATI RN
Nervous System Questions Questions
Question 1 of 5
The rectus eye muscle capable of causing the eyeball to turn laterally in a horizontal plane is innervated by which cranial nerve?
Correct Answer: B
Rationale: The lateral rectus, innervated by the abducens nerve (VI), moves the eye laterally. Oculomotor (III) and trochlear (IV) move other muscles.
Question 2 of 5
The presence of myelin gives a nerve fiber its:
Correct Answer: B
Rationale: Myelin, a lipid-rich sheath, gives axons a white appearance and speeds impulse transmission via saltatory conduction. Gray matter lacks myelin, regeneration is PNS-specific (Schwann cells).
Question 3 of 5
The junction between the two neurons is called:
Correct Answer: C
Rationale: A synapse is the junction between neurons where signals pass chemically or electrically.
Question 4 of 5
The nurse is explaining the pathophysiology of multiple sclerosis to a client just diagnosed with this condition. As part of this explanation, the nurse teaches the client that the function of the myelin sheath is to:
Correct Answer: C
Rationale: Myelin insulates axons, enabling rapid, smooth impulse transmission via saltatory conduction. It doesn’t nourish cells, connect brain to periphery, or protect dendrites specifically.
Question 5 of 5
The nurse is testing deep tendon reflexes (DTR) on a client. The nurse is aware that stimulation of the tendon produces which kind of physiological response?
Correct Answer: B
Rationale: DTRs (e.g., knee jerk) are somatic reflexes involving skeletal muscle via spinal cord, not autonomic (visceral), sympathetic, or parasympathetic responses.