Dermatomes Flashcards
C2
At least 1cm lateral to occiptal protuberance at the base of the skull
At least 3cm behind the ear
C3
In the supraclavicular fossa, at the midclavicular line
C4
Over the acromioclavicular joint
C5
On the lateral (radial) side of the antecubital fossa just proximal to the elbow (see image below)
C6
On the dorsal surface of the proximal phalanx of the thumb
C7
On the dorsal surface of the proximal phalanx of the middle finger
C8
On the dorsal surface of the proximal phalanx of the little finger
T1
On the medial (ulnar) side of the antecubital fossa, just proximal to the medial epicondyle of the humerus
T2
At the apex of the axilla
T3
At the midclavicular line
3rd coastal space
Found by palpating the anterior chest to locate the third rib and the corresponding third intercostal space below it
T4
At the midclavicular line
4th intercostal space
Located at the level of the nipples
T5
At the midclavicular line
5th intercostal space
Located midway between the level of the nipples and the level of the xiphisternum
T6
At the midclavicular line
Located at the level of the xiphisternum
T7
At the midclavicular line
1/4 of the distance between the level of the xiphisternum and the level of the umbilicus
T8
At the midclavicular line
1/2 of the distance between the level of the xiphisternum and the level of the umbilicus
T9
At the midclavicular line
3/4 of the distance between the level of the xiphisternum and the level of the umbilicus
T10
At the midclavicular line
Located at the level of the umbilicus
T11
At the midclavicular line
Midway between the level of the umbilicus and the inguinal ligament
T12
At the midclavicular line
Over the midpoint of the inguinal ligament
L1
Midway between the key sensory points for T12 and L2
L2
On the anterior-medial thigh
At the midpoint drawn on an imaginary line connecting the midpoint of the inguinal ligament and the medial femoral condyle
L3
At the medial femoral condyle above the knee
L4
Over the medial malleolus
L5
On the dorsum of the foot at the third metatarsal phalangeal joint
S1
On the lateral aspect of the calcaneus
S2
At the midpoint of the popliteal fossa
S3
Over the ischial tuberosity or infragluteal fold (depending on the patient their skin can move up, down, or laterally over the ischii)
S4/5
In the perianal area, less than one cm lateral to the mucocutaneous junction
