myotmes dermatomes.pptx

7/25/2019 myotmes dermatomes.pptx

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Spinal

nerves 31

pairs,

emerging ateach

vertebral

level


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Cervical Plexus


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Brachial Plexus


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Lumbarsacral

plexus


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MYOTOMES &

DERMATOMES Myotomes

Each muscle in the

body is supplied by aparticular level orsegment of the spinalcord and by its

corresponding spinalnerve.

Dermatomes

~Greek for"skin

cutting"~An area of the

skin supplied byspecific nerve fibers.

Sensory


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http://www.cafepress.com/apparelyzed/434981


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Dermatomes and Myotomes

Dermatome- sensory region of skin

innervated by a nerve root

Myotome- muscles innervated by a single

nerve root


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Common Dermatomal Levels

C5- houlder

C!- Lateral "rm and Digits #$%

C&- Middle Digit

C'- Digits ( $ 5


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L(- "nteromedial hin

L5- "nterolateral hin) dorsum of foot to

big toe


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#- toe) lateral foot) sole and calf


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"*") %++!


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,eurologic Level C5 The muscles found

within this myotomalpattern are thedeltoid and thebiceps brachii.

ecause the latter isalso inner!ated by"#$ the deltoid is themost %pure% "muscle.

One of the mostcommonly used testsfor shoulderabduction is toinstruct the patientto 'e( the elbow at

)* de+rees$ theno,er radual


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,eurologic Level C!

the biceps brachii isinner!ated by "and "#. "# also

inner!ates the mostpowerful wriste(tensors$ carpiradialis lon+us andbre!is$ which do

radial e(tension. Totest for wriste(tension$ stabili-ethe patients forearmand wrist e(tension


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,eurologic Level C&

The muscles foundwithin this myotomalpattern are the triceps,wrist flexors. The tricepsmuscle primarily does

elbow extension. common test for thisaction is to as! thepatient to fully flex thearm, offer firm, constant

resistance untildiscerning themaximum resistanceh"she can overcome.


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,eurologic Level C'

The muscles foundwithin this myotomalpattern are /n+er'e(ors0'e(ordi+itorumsuper/cialis$ 'e(or

di+itorum profundis$and the lumbricals.To test for /n+er'e(ion$ the patientfully 'e(es h1her/n+ers at all 2ointswhile you curl your/n+ers into them.As3 the patient toresist your attemptto pull h1her /n+ers

out of 'e(ion.


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,eurologic level .#

The muscles foundwithin this myotomalpattern are thoseinvolved in finger

abduction#dorsalinterossei and abductordigiti minimi, andadduction#palmarinterossei.To test for fingeradduction, as! thepatient to extend h"herfingers and hold a pieceof paper $or a dollar bill%between two of h"her

fingers. Then you pull itout


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,eurologic Levels .#% to L/

The muscles foundwithin this myotomalpattern are the

iliopsoas$4uadriceps$ and theadductors ecausethis myotomalpattern includesmultiple muscle

+roups an in2ury tothis ner!e root le!elcan be more easilye!aluated by sensorytestin+ of the

dermatomalpatterns.


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,eurologic Level L(

The musclepredominantlyinner!ated at this

root ner!e le!el isthe tibialis anterior$which doesdorsi'e(ion.

5nstruct the patient

to dorsi'e( andin!ert h1her foot.6ith your free hand$hold the patientsfoot and as3 h1her toresist your attempt


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,eurologic Level L5

The musclesfound within this

myotome are thee(tensor hallucislon+us 7bi+ toee(tensor8 &

e(tensordi+itorum 7heelwal38


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,eurologic Level #

The musclesfound within this

myotome are theperoneus lon+us7e!ersion8 &peroneus bre!is

7e!ersion8


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myotmes dermatomes.pptx

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