Dermatome and Myotome Scans

Upper-Extremety Screens
Myotomes
Resisted MotionMyotome
Shoulder ShrugC2,C3,C4
Arm Abduction (Deltoids)C5
Elbow FlexionC6
Elbow ExtensionC7
Wrist ExtensionC6,C7
Wrist FlexionC7
Thumb ExtensionC8
Finger Abduction & AdductionT1

Dermatomes
Dermatomal TestingDermatome
Posterior Aspect of Head/OcciputC2
Lateral Aspect of NeckC3
Acromioclavicular JtC4
Over DeltoidC5
Tip of Thumb/Radial Side of WristC6
Tip of Middle FingerC7
Tip of Little Finger/Ulnar Side of WristC8
Medial ElbowT1
Medial Upper ArmT2
Segmental TrunkT3-T12

Reflexes
ReflexSpinal Segment
BicepsC5
BrachioradialisC6
TricepsC7

Pathological Reflexes:
 Wrist Clonus - Relax arm, hand and wrist. Wrist prone. Snap wrist back into extension.
look for - Shaking of UE

Lower-Extremety Screens
Myotome
Resisted MotionMyotome
Hip FlexionL1,L2
Knee ExtensionL3,L4
Ankle DorsiflexionL4,L5
Extesnsion of Big ToeL5
Ankle PlantarflexionS1

Dermatomes
Dermatomal TestingDermatome
Groin (by report)L1
Upper 1/3 of Anterior ThighL2
Medial KneeL3
Lateral Knee to Medial MalleolusL4
Lateral Lower Leg to Dorsum of Big ToeL5
HeelS1
Medial Aspect of Posterior ThighS2
Perianal Area (by report)S3,4,5

Reflexes
ReflexSpinal Segment
Patellar TendonL4
Achilles TendonS1

Pathological Reflexes:
 Babinski - Take metal end of reflex hammer and run across the lateral aspect of the bottom of the foot.
look for - Toes to extend and spread apart.
Ankle Clonus - Relax leg and foot. Snap foot back into dorsiflexion.
look for - Shaking of LE

Converted from chart courtesy Maureen Pascal and Lynnette Chandler 1999
For a copy in Adobe Acrobat format click here.
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