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

Q

L3 dermatome key test point

A

medial femoral condyle above the knee

Q

L4 dermatome key test point

A

medial malleolus

Q

L5 dermatome key test point

A

dorsum of foot at 3rd MTP joint

Q

S1 dermatome key test point

A

lateral heel

Q

S2 dermatome key test point

A

midpoint of popliteal fossa

Q

S3 dermatome key test point

A

ischial tuberosity or infragluteal fold

Q

S4-5 dermatome key test point

A

perianal area (taken as one level)