The thoracic nerve distribution is characterized by strict segmental organization, making it an excellent model for understanding dermatomes and myotomes. Key clinical applications include diagnosing shingles (dermatome rule), managing chest wall pain, performing regional anesthesia, and predicting functional loss after spinal cord injury. Unlike the limbs, the thorax lacks a complex plexus, allowing each nerve to serve a discrete territory—a feature that is both anatomically elegant and clinically practical.
Supplies the deep muscles of the back and provides sensation to the skin of the back. Ventral (Anterior) Ramus: T11cap T 11 thoracic nerve distribution
| Landmark | Corresponding Thoracic Nerve | | :--- | :--- | | Supraclavicular fossa | C3–C4 (not thoracic) | | Apex of axilla | T1–T2 | | Sternal angle (manubriosternal) | T2 | | Nipple (4th intercostal space) | | | Xiphoid process | T6 | | Costal margin | T7 | | Umbilicus | T10 | | Pubic symphysis / inguinal ligament | T12 / L1 | The thoracic nerve distribution is characterized by strict
(Intercostal Nerves): These travel along the costal grooves of the ribs to supply intercostal muscles, the chest wall, and the skin of the thorax. T12cap T 12 Supplies the deep muscles of the back and
