ATI RN
Questions About the Nervous System Questions
Question 1 of 5
The cell body of all sensory neurons is located within the:
Correct Answer: B
Rationale: The dorsal root ganglion (DRG) houses the cell bodies of sensory neurons, adjacent to the spinal cord. The dorsal gray horn processes sensory signals, the spinal cord is a broader structure, and the brain is not the site for sensory neuron cell bodies.
Question 2 of 5
The cell bodies of the preganglionic neurons of the sympathetic division are located within the:
Correct Answer: C
Rationale: Sympathetic preganglionic cell bodies are in the lateral horns of thoracic and lumbar (T1-L2) spinal cord gray matter, not cervical/sacral (parasympathetic) or white matter.
Question 3 of 5
The largest of the paravertebral ganglia, which carries sympathetic impulses to the eye, salivary glands, and mucosa of the mouth, is the:
Correct Answer: A
Rationale: The superior cervical ganglion supplies sympathetic innervation to the head (eye, salivary glands, mucosa). Celiac and mesenteric serve abdominal organs, stellate is lower.
Question 4 of 5
Which class of drugs may be used to treat bronchial asthma?
Correct Answer: C
Rationale: Adrenergic drugs (e.g., β₂ agonists like albuterol) dilate bronchi to treat asthma. Cholinergics constrict, anticholinesterases enhance acetylcholine, blockers inhibit dilation.
Question 5 of 5
The cranial nerve with the greatest distribution is the:
Correct Answer: B
Rationale: The vagus nerve (X) has the widest distribution, innervating thorax and abdomen. Trigeminal is facial, abducens is eye-specific.