Term
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Definition
Dermatome: Cutaneous innervation from specific spinal segment
Myotome: Muscular innervation, usually from 2+ spinal segments |
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Term
| Dermatomes covered in upper limb |
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Definition
Pre-Brachial Plexus (C3,C4) and Brachial Plexus (C5,C6,C7,C8,T1)
Important Note:
If you keep in mind the order from LATERAL --> MEDIAL of the brachial plexus branches, it becomes easier to understand the Dermatomes:
Mnemonic:
My Aunt Raped My Uncle
Musculocutaneous, Axillary, Radial, Median, Ulnar
(C5 --> T1) |
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Term
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Definition
| C3 and C4 (Supraclavicular nerves) |
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Term
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Definition
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Term
| Lateral ARM + Posterior Arm+Forearm |
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Definition
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Term
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Definition
| C6 via Musculocutaneous nerve |
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Term
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Definition
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Term
| Index finger (1st finger) |
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Definition
| C6 via Median nerve (palmar) and Radial n (dorsum) |
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Term
| Middle Finger (2nd finger) |
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Definition
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Term
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Definition
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Term
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Definition
T1 via Medial brachial cutaneous nerve (Medial Arm) and Medial AnteBrachial cutaneous nerve (Medial forearm)
*Called Medial b/c comes from Medial Cord |
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Term
| Myotomes of Upper limb will be the next topic. Recall that Myotomes can have 2 or more spinal segments, but single segments will be presented |
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Definition
On Definition side,
1) Myotome level
2) Resistance Test
3) Nerve involved |
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Term
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Definition
1. C5
2. Have Arms in 90 deg abduction --> Examiner push down and have patient resist via ABDUCTION
3) Axillary nerve |
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Term
| Flexors of Arm (Biceps, Brachialis, Brachioradialis) |
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Definition
1) C6
2) "flex arm against pull"
Patient: arm flexed, Examiner pull and have patient resist.
3) Musculocutaneous nerve and Radial n |
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Term
| Wrist extensors (E. carpi radialis longus/brevis, E. carpi ulnaris) |
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Definition
1) C6
2) Patient extends wrist against resistance
3) Radial nerve |
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Term
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Definition
1) C7
2) Full abduction and flexion of shoulder (tricep dumbell style). Patient resists pressure to see if triceps are working
3) Radial nerve |
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Term
| Finger Flexors (F. digitorum superficialis/profundi) |
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Definition
1) C8
2) Flex fingers against resistance
3) Median n (lateral half) and Ulnar n (medial half) |
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Term
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Definition
1) C8/T1
2) Abduct/Adduct against R
3) Ulnar nerve |
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Term
| Notice general top bottom pattern (flip card) |
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Definition
Top muscles --> Bottom muscles
C5 myotome ---> T1 Myotome
Generally!
Don't forget the C6 deviation from this rule (does flexor arm muscles but also wrist extensors) |
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