Nerve/disc Principal Dermatomes
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1
2Nerve/Disc Principal Dermatomes
Nerve
Motor Test
Sensation Test
Radial nerve
Wrist extension
Dorsal web space
Thumb extension
between thumb and
index finger
Ulnar nerve
Abduction- little finger
Distal ulnar aspect-
little finger
Median nerve
Thumb pinch
Distal radial aspect-
Opposition of thumb
index finger
Axillary nerve
Deltoid
Lateral arm- deltoid
patch on upper arm
Musculocutaneous
Biceps
Lateral forearm
nerve
Disc
Root
Reflex
Muscles
Sensation
C
-C
C
Biceps reflex
Deltoid Biceps
Lateral arm
4
5
5
Axillary nerve
C
-C
C
Brachioradialis reflex
Wrist Extension
Lateral forearm
5
6
6
(Biceps reflex)
Biceps
Musculocutaneous
nerve
C
-C
C
Triceps reflex
Wrist flexors
Middle finger
6
7
7
Finger Extension
Triceps
C
-T
C
Finger Extension
Medial forearm
7
1
8
Hand Intrinsics
Med. ant. branch.
Cutaneous nerve
T
-T
T
Hand Intrinsics
Medial arm
1
2
1
Med. branch.
Cutaneous nerve
L
-L
L
Patellar reflex
Anterior tibialis
Medial leg and
3
4
4
medial foot
L
-L
L
None
Extensor hallucis
Lateral leg and
4
5
5
? Internal hamstring
longus
dorsum of foot
Peroneus longus
L
-S
S
Achilles Internal
Gastrocnemius
Sole of foot
5
1
1
hamstring
Lateral foot
External hamstring
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