Intermediate Least Splanchnic Nerve Quiz

Q1. How does the least splanchnic nerve typically reach the abdomen from the thorax?

• It passes through the obturator canal
• It enters through the foramen magnum
• It passes through the inguinal canal
• It passes through or behind the diaphragmatic crus

Q2. Which autonomic plexus is closely associated with the renal artery and receives fibers related to the least splanchnic pathway?

• Renal plexus
• Sacral somatic plexus
• Brachial plexus
• Cervical plexus

Q3. How do postganglionic sympathetic fibers associated with the renal plexus commonly reach the kidney?

• Along the renal arterial tree
• Through the inguinal ligament
• Through the vagal trunks
• Through the femoral nerve

Q4. Which statement best compares the usual segmental origins of the lesser and least splanchnic nerves?

• Lesser from T10 to T11 and least from T12
• Lesser from C1 to C4 and least from C5
• Both arise exclusively from S2 to S4
• Lesser from L4 to L5 and least from S1

Q5. What is the relationship between the least splanchnic nerve and the aorticorenal plexus?

• It can contribute sympathetic fibers to the aorticorenal plexus
• It is a parasympathetic branch of the vagus
• It terminates only in the anterior abdominal wall
• It forms the somatic lumbar plexus

Q6. Which sympathetic effect can renal autonomic fibers associated with this pathway produce?

• Renal vasoconstriction
• Voluntary contraction of the kidney
• Direct production of urine by neurons
• Generalized relaxation of renal vascular smooth muscle

Q7. Which renal cells can be influenced by sympathetic fibers to promote renin release?

• Urothelial cells of the renal pelvis
• Podocytes only
• Parietal cells of Bowman's capsule
• Juxtaglomerular cells

Q8. Why can visceral pain afferents travel within a nerve that is primarily described as sympathetic?

• Autonomic nerves can contain sympathetic efferents and visceral afferents together
• Pain fibers are converted into sympathetic efferents
• Every sympathetic fiber is also a somatic motor fiber
• Visceral pain is transmitted only by parasympathetic nerves

Q9. Which feature distinguishes the least splanchnic nerve from a typical gray ramus communicans?

• It is entirely parasympathetic
• It carries only postganglionic fibers to body wall spinal nerves
• It carries preganglionic fibers toward abdominal prevertebral pathways
• It contains only somatic motor fibers

Q10. Why should the least splanchnic nerve not be assumed to have an identical anatomy in every person?

• Its spinal cord origin changes between sympathetic and parasympathetic divisions
• It always merges with the vagus nerve
• Its formation and presence show anatomical variation
• It is present only in children