| Region | Abbreviation | # of Nerves | Key Body Regions Controlled | | :--- | :--- | :--- | :--- | | | C1–C8 | 8 | Neck, diaphragm, shoulders, arms, hands | | Thoracic | T1–T12 | 12 | Chest, upper back, abdominal muscles | | Lumbar | L1–L5 | 5 | Lower back, hips, front of thighs, knees | | Sacral | S1–S5 | 5 | Buttocks, back of legs, feet, bowel/bladder | | Coccygeal | Co1 | 1 | Tailbone area |
This map is consistent across humans but has minor individual variations (e.g., the C6/C7 border can shift). In clinical practice, it is a guideline — not an absolute blueprint. spinal cord nerve map
A single pair located at the tailbone. Clinical Mapping Tools | Region | Abbreviation | # of Nerves