Okay, let's tackle this question. The patient has a duodenal peptic ulcer and is experiencing epigastric pain. The question is asking about the structure that contains the cell bodies of abdominal pain fibers.

First, I need to recall the anatomy of pain pathways. Pain fibers from the abdomen are part of the visceral sensory system. Visceral pain is transmitted via the autonomic nervous system. The cell bodies of these sensory neurons are located in the dorsal root ganglia. Wait, but there's also the sympathetic chain ganglia. Let me think.

Visceral pain fibers from the abdomen, like those from the duodenum, are part of the sympathetic nervous system. The cell bodies of these visceral afferents are in the dorsal root ganglia. The fibers then travel through the sympathetic chain, but the cell bodies themselves are in the dorsal root ganglia. So the answer should be the dorsal root ganglia. Let me check the options again. The options aren't given, but the correct answer is likely the dorsal root ganglia.

Wait, another thought: some visceral afferents might synapse in the sympathetic ganglia. For example, in the thoracic sympathetic chain. But the cell bodies are still in the dorsal root ganglia. So the cell bodies are in the dorsal root ganglia, and the fibers travel through the sympathetic chain. Therefore, the correct answer is the dorsal root ganglia. The other options might include sympathetic ganglia, which is incorrect because the cell bodies are not there. So the answer is the dorsal root ganglia.

**Core Concept**
Abdominal pain from visceral organs like the duodenum is transmitted via **visceral afferent fibers**. These fibers have **cell bodies located in the dorsal root ganglia**, which are part of the **somatic sensory division** of the peripheral nervous system. Visceral pain pathways involve sensory neurons with cell bodies in these ganglia, projecting centrally to the spinal cord.

**Why the Correct Answer is Right**
The **dorsal root ganglia** contain the cell bodies of all sensory neurons, including those responsible for visceral pain. Pain fibers from the duodenum (a visceral organ) travel via the **sympathetic chain** but originate from neurons in the **dorsal root ganglia**. These neurons synapse in the spinal cord, where visceral pain is processed. The **sympathetic ganglia** (e.g., paravertebral) are not sites of cell bodies but relay stations for sympathetic fibers.

**Why Each Wrong Option is Incorrect**
**Option A:** Sympathetic chain ganglia – These contain cell bodies of **sympathetic postganglionic neurons**, not visceral afferents.
**Option B:** Vagus nerve – This carries visceral afferents from the thorax and upper abdomen, but **not** for the duodenum (which is innervated by T10–L1 spinal nerves).
**Option C:** Spinal cord – Contains **central processes** of sensory neurons but not their cell bodies.

**Clinical Pearl**
Remember: **“Dorsal root ganglia = sensory cell bodies”** (for all somatic and visceral sensory neurons). Confusion with sympathetic ganglia (autonomic cell bodies) is common but critical for NEET/USMLE. Visceral pain from the

✓ Correct Answer: C. Dorsal root ganglion