Dermatomes and Myotomes Flashcards by Asha Dyer

Q

C5 myotome key test muscles

A

Arm abduction (deltoid)

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Q

C6 myotome key test muscles

A

Elbow flexion (biceps brachii, brachialis)

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Q

C7 myotome key test muscles

A

Elbow extension (triceps brachii)

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Q

C8 myotome key test muscles

A

3rd finger flexion (flexor digitorum profundus)

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Q

T1 myotome key test muscles

A

5th finger abduction (abductor digiti minimi)

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Q

L2 myotome key test muscles

A

Hip flexion (iliopsoas)

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Q

L3 myotome key test muscles

A

Knee extension (quadriceps)

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Q

L4 myotome key test muscles

A

Ankle dorsiflexion (tibialis anterior)

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Q

L5 myotome key test muscles

A

1st toe extension (extensor hallucis longus)

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Q

S1 myotome key test muscles

A

Ankle plantarflexion (gastrocnemius, soleus)

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Q

C2 dermatome key test point

A

~3cm behind the ear

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Q

C3 dermatome key test point

A

supraclavicular fossa (posterior to clavicle)

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Q

C4 dermatome key test point

A

over the acromioclavicular joint

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Q

C5 dermatome key test point

A

lateral side of cubital fossa just proximal to elbow crease

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Q

C6 dermatome key test point

A

thumb, dorsal surface, proximal phalanx

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Q

C7 dermatome key test point

A

middle finger, dorsal surface, proximal phalanx

Q

C8 dermatome key test point

A

little finger, dorsal surface, proximal phalanx

Q

T1 dermatome key test point

A

medial side just proximal to medial epicondyle of the humerus

Q

T2 dermatome key test point

A

apex of the axilla

Q

T4 dermatome key test point

A

nipple line at the midclavicular line

Q

T10 dermatome key test point

A

umbilicus midclavicular line

Q

T12 dermatome key test point

A

mid-point of inguinal ligament

Q

L1 dermatome key test point

A

midway between key sensory points for T12 and L2

Q

L2 dermatome key test point

A

antero-medial thigh at the mid thigh

L3 dermatome key test point

medial femoral condyle above the knee

L4 dermatome key test point

medial malleolus

L5 dermatome key test point

dorsum of foot at 3rd MTP joint

S1 dermatome key test point

lateral heel

S2 dermatome key test point

midpoint of popliteal fossa

S3 dermatome key test point

ischial tuberosity or infragluteal fold

S4-5 dermatome key test point

perianal area (taken as one level)