ATI RN
Test Questions on Autonomic Nervous System Questions
Question 1 of 5
A channel opens on a postsynaptic membrane that causes a negative ion to enter the cell. What type of graded potential is this?
Correct Answer: C
Rationale: When a negative ion (e.g., Cl⁻) enters, the membrane potential becomes more negative, causing a hyperpolarizing graded potential (inhibitory postsynaptic potential, IPSP).
Question 2 of 5
Cell bodies for the motor supply of the trigeminal nerve lie
Correct Answer: D
Rationale: The motor nucleus of the trigeminal nerve (CN V) is in the pons, near the floor of the fourth ventricle (option e). The hypothalamus and cortex don’t house motor nuclei, and the midbrain contains CN III/IV nuclei.
Question 3 of 5
with regard to myotomal nerve supply
Correct Answer: D
Rationale: Elbow extension (triceps) is a C7-C8 myotome. Opponens pollicis is C8-T1, shoulder abduction is C5-C6, and plantar flexion is S1-S2.
Question 4 of 5
A 40 year old man suffered a whiplash injury to his neck and now complains of pain along the lateral aspect of his left forearm, and there is weakness of his left biceps. What is the most likely cause of his symptoms?
Correct Answer: C
Rationale: C6 root (C5-C6 disc prolapse) supplies the lateral forearm (dermatome) and biceps (myotome via musculocutaneous nerve). C5 affects shoulder, C7 the middle finger, and C4 is higher.
Question 5 of 5
The 4th cranial nerve supplies
Correct Answer: D
Rationale: The trochlear nerve (CN IV) supplies the superior oblique muscle, enabling downward/outward eye movement.