C4
over the acromioclavicular joint
C5
lateral shoulder and arm
C6
thumb, index finger (i.e., radial border of hand)
C7
middle finger
C8
ulnar border of hand
T1
medial elbow region
T10
horizontal level of the umbilicus
L1
over greater trochanter and groin
L2
front of thigh
L3
upper buttock
L4
dorsum of foot, big toe