Where are the cell bodies belonging to presynaptic sympathetic neurons located?

Question

BlackTom AI · Accepted Answer

Preganglionic (presynaptic) sympathetic neurons are located in the intermediolateral cell column, which appears as the lateral horn of the spinal cord gray matter in the thoracolumbar segments. This region contains the cell bodies whose axons are the preganglionic sympathetic fibers.

Relevant knowledge points and concepts
- Autonomic nervous system divisions: sympathetic (thoracolumbar) and parasympathetic (craniosacral).
- “Preganglionic” = presynaptic neuronal cell body in the CNS; its axon exits to synapse in an autonomic ganglion.
- In the spinal cord, the sympathetic preganglionic cell bodies occupy the lateral horn (intermediolateral cell column) of segments T1 through L2 (sometimes cited as T1–L2/L3 depending on individual variation).

Step-by-step reasoning
1. Identify which division is being asked: presynaptic sympathetic neurons → sympathetic division.
2. Recall the characteristic outflow of sympathetic nerves: thoracolumbar outflow (T1–L2).
3. Recall anatomical location: sympathetic preganglionic cell bodies reside in the lateral horn (intermediolateral cell column) of the spinal cord gray matter at those segments.
4. Note their axons leave via ventral roots, pass through white rami communicantes, and synapse in paravertebral (sympathetic chain) or prevertebral ganglia.

Why the correct answer is correct
The lateral horns of T1–L2 contain the intermediolateral cell column that is the known origin of sympathetic preganglionic neurons; this is standard in neuroanatomy texts and explains thoracolumbar sympathetic outflow.

Why the other options are incorrect
- “Brainstem AND lateral horns of T1-L2”: brainstem contains parasympathetic (cranial) preganglionic cell bodies (CN III, VII, IX, X), not sympathetic.
- “L3-L5 segments”: outside the standard thoracolumbar outflow; lateral horns are typically absent or not sympathetic in L3–L5.
- “Brainstem AND S2-4 segments”: S2–S4 are the sacral (parasympathetic) outflow (pelvic splanchnic nerves), not sympathetic.
- “Gray matter of the C1-4 segments”: cervical segments house somatic and some autonomic fibers via connections but not the primary sympathetic preganglionic cell column (the main sympathetic cell bodies are T1–L2).

Conclusion
Therefore, the presynaptic sympathetic neuron cell bodies are located in the lateral horns of the T1–L2 segments of the spinal cord, matching the provided correct answer.

Where are the cell bodies belonging to presynaptic sympathetic neurons located?单项选择题

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