ATI RN
Questions About the Nervous System Questions
Question 1 of 5
Which of the following neurotransmitters is associated with inhibition exclusively?
Correct Answer: A
Rationale: GABA (gamma-aminobutyric acid) is the primary inhibitory neurotransmitter in the CNS, causing hyperpolarization. Acetylcholine, glutamate (excitatory), and norepinephrine have varied effects.
Question 2 of 5
regarding the innervation of the bladder
Correct Answer: A
Rationale: Parasympathetic innervation via pelvic splanchnic nerves (S2-S4) relaxes the sphincter and contracts the detrusor for urination. Sympathetic innervation (T11-L2, not L3-L4) inhibits the bladder, and sensation travels via both systems.
Question 3 of 5
The dermatome supplying the great toe is usually
Correct Answer: C
Rationale: The great toe is supplied by the L5 dermatome, covering the lateral leg and dorsal foot. L4 supplies the medial foot, and S1 the lateral foot.
Question 4 of 5
In the spinal cord:
Correct Answer: A
Rationale: Brown-Sequard syndrome (cord hemisection) causes ipsilateral motor/touch/proprioception loss (corticospinal/dorsal columns) and contralateral pain/temperature loss (spinothalamic). The cord ends at L1-L2, and corticospinal is key.
Question 5 of 5
All of the following are branches of the ophthalmic division of the trigeminal nerve EXCEPT:
Correct Answer: B
Rationale: The infraorbital nerve is a maxillary (V2) branch, not ophthalmic (V1). Lacrimal, supraorbital, and infratrochlear are V1 branches.