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Neuro.
Key Dermatomes
| Question | Dermatome | Myotome | Reflexes |
|---|---|---|---|
| C2 | occipital protuberance | Neck muscles | - |
| C5 | clavicles | Supra, Infra, Delt, Biceps | Biceps, Brachioradialis |
| C6 | thumb | Biceps, Supinator, Wrist extensors | Biceps, Brachioradialis |
| C7 | middle finger | Wrist flexors, Triceps | Triceps |
| C8 | pinky | Thumb extensors & adductors, ulnar deviators | Triceps |
| T1 | medial side antecubital fossa | - | - |
| T2 | apex of axilla | - | - |
| T4 | nipples | - | - |
| T6 | xiphisternum | - | - |
| T10 | umbilicus | - | - |
| T12 | groin | - | - |
| L2 | mid-anterior thigh | Psoas, Hip adductors | - |
| L3 | medial femoral condyle (knee) | Psoas, Quad. | pain with SLR |
| L4 | medial malleolus | Tibialis Anterior, Extensor Hallucis | knee flexion (HS) |
| L5 | dorsum of foot @ 3rd MTP | Extensor Hallucis, peroneals, Glut. med, DF's, hamstring & calf | knee jerk/ knee ext |
| S1 | lateral heel | Calf & hamstring, gluts, peroneals, PF's | limited SLR, Achilles reflex weak or absent |
| S2 | popliteal fossa | same as S1 except peroneals (calf, hamstring, PF's) | limited SLR, Achilles reflex weak or absent |
| S4-5 | perianal | bladder, rectum | - |