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The subcostal nerve, which is the twelfth thoracic nerve (T12), primarily provides motor innervation to the abdominal muscles, particularly the external oblique muscle. It also supplies sensory innervation to the skin of the lower abdomen and the upper part of the hip. Additionally, the subcostal nerve contributes to the sensory innervation of the peritoneum and may provide some fibers to the iliac region. Overall, it plays a crucial role in both motor and sensory functions in the lower thoracic and upper abdominal regions.

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8mo ago

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