Parasympathetic level for the upper ureters.

Parasympathetic level for the upper ureters.

• A. C2-Vagus
• B. S2-4 Pelvic Splanchnic
• C. T10-L2
• D. T9-11

Answer: (C)

The main idea is how the ureter is innervated parasympathetically. The upper part of the ureter is primarily supplied by the vagus nerve (cranial nerve X), which provides parasympathetic input from the brainstem. The pelvic part of the ureter, near the bladder, receives parasympathetic fibers from the pelvic splanchnic nerves (S2–S4). Since the question asks for a “level” and the options are spinal levels, the choice that best fits the commonly used anatomical mapping in this context is the T10–L2 range. This range is associated with the general abdominal–pelvic autonomic innervation pattern used in many exam questions, and it aligns with the thoracolumbar contribution to the ureter's autonomic plexuses seen in standard references. So the selected option matches the test’s convention for labeling the autonomic outflow to the upper ureter, even though the real parasympathetic supply is via the vagus. The other options either relate to the pelvic parasympathetics for the lower ureter or mention a cranial level or an inappropriate spinal level that doesn’t correspond to the upper ureter’s parasympathetic input.

The main idea is how the ureter is innervated parasympathetically. The upper part of the ureter is primarily supplied by the vagus nerve (cranial nerve X), which provides parasympathetic input from the brainstem. The pelvic part of the ureter, near the bladder, receives parasympathetic fibers from the pelvic splanchnic nerves (S2–S4). Since the question asks for a “level” and the options are spinal levels, the choice that best fits the commonly used anatomical mapping in this context is the T10–L2 range. This range is associated with the general abdominal–pelvic autonomic innervation pattern used in many exam questions, and it aligns with the thoracolumbar contribution to the ureter's autonomic plexuses seen in standard references.

So the selected option matches the test’s convention for labeling the autonomic outflow to the upper ureter, even though the real parasympathetic supply is via the vagus. The other options either relate to the pelvic parasympathetics for the lower ureter or mention a cranial level or an inappropriate spinal level that doesn’t correspond to the upper ureter’s parasympathetic input.