ATI RN
Test Questions on Autonomic Nervous System Questions
Question 1 of 5
Which cranial nerve lies in the junction between pons and medulla?
Correct Answer: A
Rationale: The abducent nerve (CN VI) emerges at the pontomedullary junction, innervating the lateral rectus muscle. The facial (VII) and vestibulocochlear (VIII) nerves emerge from the pons, while glossopharyngeal (IX) emerges from the medulla.
Question 2 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 3 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 4 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.
Question 5 of 5
The infratrochlear nerve supplies the
Correct Answer: C
Rationale: The infratrochlear nerve (V1) supplies sensation to the bridge of the nose and medial eyelid.