T9 spinal nerve

Nervus spinalis T9

NervousNervesThoraxLeft and right

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What it is
The T9 spinal nerve leaves the spinal canal between T9 and T10. Its sensory (dorsal) and motor (ventral) roots meet just beyond the dorsal root ganglion; the short mixed nerve then splits into a small dorsal ramus for the back muscles and skin and a larger ventral ramus, which becomes the 9th intercostal nerve.
Function
Carries motor fibres to the muscles of its segment (myotome) and sensation back from its strip of skin (dermatome): a band of skin across the upper abdomen.
Size
About 2-3 mm thick; the mixed nerve is only ~1 cm long before it divides
Clinical note
A T9 dermatome band crosses the upper abdomen halfway between xiphoid and umbilicus.

Nearby nervous structures 6th intercostal nerve, 7th intercostal nerve, T10 spinal nerve, T11 spinal nerve, T12 spinal nerve, T5 spinal nerve, T6 dorsal root ganglion, T6 spinal nerve, T7 spinal nerve, T8 spinal nerve