The dermatomes

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The cranial nerves

The face is supplied by 3 branches of the trigemminal nerve, and the back of the head is supplied by the cervical nerves.



the spinal nerves

C1-8 supplies the  back of head and upper limbs
C3-4 supplies the shoulder.
C6, 7 and 8 supplies the hand from lateral to medial.
T1-12 supplies the trunk 
T1 supplies the anterior medial surface of the arm.
T4 is at the level of the nipples and T10 is at the level of the umbellicus
L1-5 supplies the anterior leg and lower back.
L2 supplies the pocket shaped areas
L3 supplies the knee
S1 supplies the lateral side of the foot
S2 supplies the back of leg
S3 supplies the penis.

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