The cell bodies of which type of peripheral nervous system neurons are found in the structure labelled 22 in this image? [input]

Question

BlackTom AI · Accepted Answer

Dorsal root ganglia contain the cell bodies of sensory (afferent) neurons, so the structure labelled 22 houses sensory neuron cell bodies.

1) Relevant knowledge points and concepts
- The peripheral nervous system (PNS) contains sensory (afferent) neurons and motor (efferent) neurons.  
- Sensory neuron cell bodies for spinal nerves are located in dorsal root ganglia (DRG), which lie just outside the spinal cord on the dorsal root.  
- Motor neuron cell bodies for somatic motor output are located inside the spinal cord ventral horn; autonomic preganglionic cell bodies are in the lateral horn (T1–L2) or brainstem nuclei, while postganglionic autonomic cell bodies are in separate peripheral autonomic ganglia.  
- Sensory neurons in DRG are typically pseudounipolar: a single process splits into a peripheral branch (to receptor) and a central branch (to spinal cord).

2) Step-by-step reasoning
- Identify the labelled structure (22) as the dorsal root ganglion based on its anatomical position along the dorsal root (just outside the spinal cord).  
- Recall that DRG are the site of primary sensory neuron cell bodies for somatic and some visceral afferents.  
- Therefore the neurons whose cell bodies reside there are sensory (afferent) neurons.

3) Intermediate anatomical details
- Each pseudounipolar sensory neuron has a peripheral process that conveys modality-specific signals (touch, pain, temperature, proprioception) and a central process that enters the dorsal horn of the spinal cord.  
- The DRG location outside the CNS classifies these cell bodies as part of the PNS.

4) Why the correct answer is correct
- Because dorsal root ganglia are defined by containing sensory neuron cell bodies, the correct cell type is sensory (afferent) neurons.

5) Why other options are incorrect
- Motor neuron cell bodies are inside the ventral horn of the spinal cord, not in DRG.  
- Interneurons are confined to the CNS gray matter, not peripheral ganglia.  
- Autonomic postganglionic cell bodies reside in autonomic ganglia (e.g., sympathetic chain), distinct from the DRG.

6) Conclusion
The structure labelled 22 (dorsal root ganglion) contains the cell bodies of sensory neurons (afferent), matching the provided answer: Sensory neurons (dorsal root ganglia contain cell bodies of sensory neurons).

The cell bodies of which type of peripheral nervous system neurons are found in the structure labelled 22 in this image? [input]Short answer

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