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Book X
X.2 Dermatomes: lower body
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T10..............Level of umbilicus
T12
..............
Inguinal or groin regions
L1,2,3,4......Anterior and inner surfaces of lower limbs
L4,5, S1......Foot
S1,2, L5......Posterior and outer surfaces of lower limbs
S1
................
Lateral margin of foot and little toe
S2,3,4..........Perineum