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Neuromuscular Section > Nerve Root Dermatomes, Myotomes, Reflexes > Flashcards

Nerve Root Dermatomes, Myotomes, Reflexes Flashcards

1
Q

C1 Dermatome

A

Vertex of skull

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2
Q

C2 dermatome

A

Temple, forehead, occiput

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3
Q

C2 myotome (muscle weakness)

A
  1. Longus colli
  2. SCM
  3. Rectus capitis
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4
Q

C3 dermatome

A

Entire neck, posterior cheek, temporal area, prolongation forward under mandible

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5
Q

C3 Myotome (muscle weakness)

A

Trapezius, selenium capitis

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6
Q

C3 Paresthesias

A

Cheek and side of neck

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7
Q

C4 dermatome

A

Shoulder area, clavicular area, upper scapular area

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8
Q

C4 myotome (muscle weakness)

A

Trapezius, levator scapulae

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9
Q

C4 paresthesia

A

Horizontal band along clavicle and upper scapula

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10
Q

C5 dermatome

A

Deltoid area, Anterior aspect of entire arm to base of thumb

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11
Q

C5 myotome (muscle weakness)

A

Supraspinatus, infraspinatus, deltoid, biceps

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12
Q

C5 Reflexes affected

A

Biceps, brachioradialis

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13
Q

C6 dermatome

A

Anterior arm, radial side of hand to thumb and index finger

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14
Q

C6 myotome (muscle weakness)

A

Biceps, Supinator, wrist extensors

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15
Q

C6 reflex affected

A

Biceps, brachioradialis

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16
Q

C6 parasthesias

A

Thumb and index finger

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17
Q

C7 dermatome

A

Lateral arm and forearm to index, long, and ring fingers

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18
Q

C7 myotome (muscle weakness)

A

Triceps, wrist flexors (rarely wrist extensors)

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19
Q

C7 reflexes affected

A

Triceps

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20
Q

C7 paresthesias

A

Index, long and ring fingers

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21
Q

C8 dermatome

A

Medial arm and forearm to long, ring, and little fingers

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22
Q

C8 myotome (muscle weakness)

A

Ulnar debaters, thumb extensors, thumb adductors (rarely triceps)

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23
Q

C8 Parasthesias

A

Little finger alone or with tow adjacent fingers; not ring or long fingers, alone or together (C7)

24
Q

T1 dermatome

A

Medial side of forearm to base of little finger

25
Q

T1 myotome, reflex affected, and paresthesias

A

Disk lesions at upper 2 thoracic Levels do not appear to give rise to root weakness. Weakness of intrinsic muscles of the hand is due to other pathology (e.g. thoracic outlet pressure, neoplasm of lung, ulnar nerve lesion)

26
Q

T2 dermatome

A

Medial Side of upper arm to medial elbow, pectoral and midscapular areas

27
Q

T3-T12 dermatomes

A

T3-T6: upper thorax

T5-T7: costal margin

T8-T12: abdomen and lumbar region

28
Q

T3-T12 myotomes, affected reflexes, parasthesias

A

Articular and dural signs and root pain are common. Root signs (cutaneous analgesia) are rare and have such indefinite area that hey have little localizing value. Weakness is not detectable

29
Q

L1 dermatome

A

Back, over trochanter and growing

30
Q

L1 parasthesia

A

Groin; after holding posture which causes pain

31
Q

L2 dermatome

A

Back, front of thigh to knee

32
Q

L2 myotome (muscle weakness)

A

Psoas, hip adductors

33
Q

L2 parasthesias

A

Occasionally anterior thigh

34
Q

L3 dermatome

A

Back, upper buttock, anterior thigh and knee, medial lower leg

35
Q

L3 myotome (muscle weakness)

A

Psoas, quadriceps, thigh atrophy

36
Q

L3 Reflexes affected

A

Knee jerk sluggish, PKB positive, pain on full SLR

37
Q

L3 paresthesias

A

Medial knee, anterior lower leg

38
Q

L4 dermatome

A

Meidal buttock, lateral thigh, medial leg, dorsum of foot, big toe

39
Q

L4 myotome (Muscle weakness)

A

Tibial is Anterior, extensor Hallucis

40
Q

L4 reflexes affected

A

SLR limited, neck flexion pain, weak or absent knee jerk, side flexion limited

41
Q

L4 paresthesias

A

Medial aspect of calf and ankle

42
Q

L5 dermatome

A

Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sale, first, second, and third toes

43
Q

L5 myotome (muscle weakness)

A

Extensor hallucis, peroneals, gluteus medius, dorsiflexors, hamstrings and calf atrophy

44
Q

L5 Reflexes affected

A

SLR limited one side, neck flexion painful, decreased ankle, crossed-leg raising pain

45
Q

L5 paresthesias

A

Lateral aspect of leg, medial three toes

46
Q

S1 dermatome

A

Lateral and plantar aspect of foot

47
Q

S1/S2 myotome (muscle weakness)

A

Calf and hamstrings, washing of gluteals, peroneals, plantar flexors

48
Q

S1/S2 Reflexes affected

A

SLR limited, Achilles reflex weak or absent

49
Q

S1 paresthesias

A

Lateral two toes, lateral foot, lateral leg to knee, plantar aspect of foot

50
Q

S3 dermatomes

A

Groin, posteromedial thigh to knee

51
Q

S4 dermatomes

A

Perineum, genitals, lower sacrum

52
Q

S4 myotomes (muscle weakness)

A

Bladder, rectum

53
Q

S4 parasthesia

A

saddle area, genitals, anus, impotence, massive posterior herniation

54
Q

S2 dermatome

A

Buttocks, thigh, and posterior leg

55
Q

S2 parathesia

A

Lateral leg, knee, heel

Neuromuscular Section (24 decks)

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