Nerve Root Dermatomes, Myotomes, Reflexes Flashcards Preview

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

Flashcards in Nerve Root Dermatomes, Myotomes, Reflexes Deck (55)
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1

C1 Dermatome

Vertex of skull

2

C2 dermatome

Temple, forehead, occiput

3

C2 myotome (muscle weakness)

1. Longus colli

2. SCM

3. Rectus capitis

4

C3 dermatome

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

5

C3 Myotome (muscle weakness)

Trapezius, selenium capitis

6

C3 Paresthesias

Cheek and side of neck

7

C4 dermatome

Shoulder area, clavicular area, upper scapular area

8

C4 myotome (muscle weakness)

Trapezius, levator scapulae

9

C4 paresthesia

Horizontal band along clavicle and upper scapula

10

C5 dermatome

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

11

C5 myotome (muscle weakness)

Supraspinatus, infraspinatus, deltoid, biceps

12

C5 Reflexes affected

Biceps, brachioradialis

13

C6 dermatome

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

14

C6 myotome (muscle weakness)

Biceps, Supinator, wrist extensors

15

C6 reflex affected

Biceps, brachioradialis

16

C6 parasthesias

Thumb and index finger

17

C7 dermatome

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

18

C7 myotome (muscle weakness)

Triceps, wrist flexors (rarely wrist extensors)

19

C7 reflexes affected

Triceps

20

C7 paresthesias

Index, long and ring fingers

21

C8 dermatome

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

22

C8 myotome (muscle weakness)

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

23

C8 Parasthesias

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

24

T1 dermatome

Medial side of forearm to base of little finger

25

T1 myotome, reflex affected, and paresthesias

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

T2 dermatome

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

27

T3-T12 dermatomes

T3-T6: upper thorax

T5-T7: costal margin

T8-T12: abdomen and lumbar region

28

T3-T12 myotomes, affected reflexes, parasthesias

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

L1 dermatome

Back, over trochanter and growing

30

L1 parasthesia

Groin; after holding posture which causes pain