DERMATOMES

Question 1

• posterior at the level of the 1st lumbar vertebra

- supplies an area superior to the hip, posteriorly and superior thigh at the groin near its termination

Answer 1

L-1 / first lumbar

Question 2

• posterior at the level of the 2nd lumbar vertebra
• courses just inferior to L-1
• supplies an area over the posterolateral iliac crest (hip bone prominence) and the anterosuperior aspect of the thigh to the mid-level at the medial
  aspect of the thigh

Answer 2

L-2 / second lumbar

Question 3

• posterior at the level of the 3rd lumbar vertebra, the mid-low back area
• supplies an area over the posterior iliac crest, the superior part of the lateral aspect of the thigh, the central part of the anterior aspect of the thigh, the inferior
  part of the medial aspect of the thigh, the medial aspect of the knee region-not the patellar surface- and the superior ½ of the medial aspect of the leg

Answer 3

L-3 / third lumbar

Question 4

• posterior at the level of the 4th lumbar vertebra
• supplies an area over the posterosuperior gluteal region, the anteroinferior thigh, the patellar surface, the central part of the anterior aspect of the leg, the medial malleolus and the medial aspect of the midfoot and forefoot, including the hallux

Answer 4

L-4 / fourth lumbar

Question 5

• posterior at the level of the 5th lumbar vertebra, the low back
• supplies an area over the posterior iliac crest near the spine, the
  superolateral gluteal region, the inferior part of the lateral aspect of the thigh, the lateral aspect of the knee region, the anterolateral aspect of the leg, the anterior aspect of the ankle, the central part of the dorsum of the foot, toes 2 through 4, the central part of the plantar aspect of the forefoot and a small part of the calcaneal region (plantar and posterior, lateral to midline)

Answer 5

L-5 / fifth lumbar

Question 6

• posterior at the level of the 1st sacral vertebra, the low back
• supplies an area of the posterior mid-gluteal region, the posterolateral aspects of the thigh and leg, the lateral malleolus, and the lateral aspects of the calcaneal region, midfoot and forefoot, including the fifth toe

Answer 6

S-1 / first sacral

Question 7

-posterior at the level of the 2nd sacral vertebra
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• supplies an area of the posterior central gluteal region, the posteromedial
  aspects of the thigh (including the perigenital area), knee and leg regions, and the medial ½ of the calcaneal region

Answer 7

S-2 / second sacral

Question 8

• all begin posteriorly at the respective spinal vertebral level
• all form concentric arcs; with the third sacral being the largest over the posteromedial gluteal area, and the first coccygeal being the smallest around the perianal area

Answer 8

S-3, S-4, S-5 & Co-1 / third, fourth and fifth sacral and first coccygeal