Dermatomes of the trunk

• The thoracic intercostal nerves supply the parietal pleura; lateral and anterior branches are sensory to the skin of the lateral and anterior thorax.
• The thoracoabdominal intercostal and subcostal nerves supply the peritoneum; lateral and anterior sensory cutaneous branches supply the skin.
• The subcostal nerve provides cutaneous branches to the superior gluteal region.
• Other cutaneous nerves of the lower abdomen include the lateral femoral cutaneous, genitofemoral, ilioinguinal, and iliohypogastric nerves. The ilioinguinal and iliohypogastric nerves arise from the the lumbar plexus (L1) and provide cutaneous sensory innervation in the groin and upper hip and thigh regions.