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MSK 1!!! > Dermatomes/ Myotomes > Flashcards

Dermatomes/ Myotomes Flashcards

1
Q

afferent vs efferent

A

afferent- signal coming in (sensory/ dorsal horn)

efferent - signaling going out (somatic motor, ANS motor - ventral horn)

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2
Q

what are the different parts of the mesoderm?

A

intermediate mesoderm
chordamesoderm
paroxismal mesoderm
lateral mesoderm

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3
Q

what does the intermediate mesoderm give rise to?

A

kidneys/ gonads

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4
Q

what does the chordamesoderm give rise to?

A

notochord

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5
Q

what does the paraxial mesoderm give rise to?

A

head

somites -> sclerotome, myotome, dermatome

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6
Q

what does the lateral mesoderm give rise to?

A

splanchnic (circulatory system)
somatic (body cavity)
extraembryonic

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7
Q

what are the 3 sections of each somite?

A

dermatome
myotome
sclerotome

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8
Q

what does the dermamyotome in somites give rise to?

A

skeletal muscle and dermis of the skin

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9
Q

what do anterior migrating cells from the somite innervate?

A

hypaxial muscles and dermis (trunk and limbs)

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10
Q

what do posterior migrating cells from the somite innervate?

A

epaxial muscles and dermis (intrinsic back)

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11
Q

what occurs because of a dorsal root injury

A

paresthesia

sensory deficit/symptoms

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12
Q

what occurs because of a ventral root injury?

A

weakness

motor deficit/symptoms

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13
Q

what occurs to rami as they travel to their terminal location?

A

split into motor and cutaneous nerves

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14
Q

what kind of fibers are in the dorsal root?

A

sensory

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15
Q

what kind of fibers are in the dorsal rami?

A

mixed sensory/motor –> headed to the intrinsic back

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16
Q

what kind of fibers are in the ventral root?

A

motor (ANS and somatic)

17
Q

what kind of fibers are in the ventral rami?

A

mixed sensory/motor –> headed to the trunk/limbs

18
Q

what kind of rotation occurs in the legs?

A

internal rotation (which is why dermatomes seem to spiral)

19
Q

what are dermatomes?

A

area of skins upped by afferent (sensory) innervation from a single ROOT

central back = epaxial
all else = hypaxial

20
Q

what is a nerve map?

A

area of skin supplied by each nerve - with multiple root contributions

21
Q

why are myotomes clinically relevant?

A

most muscles are innervated my multiple myotomes (multisegment)

if you injure a single myotome- weakens the muscle but does not cause complete loss of function

22
Q

femoral nerve segments

A

L2-L4

23
Q

obturator nerve segments

A

L2-L4

24
Q

Sciatic nerve segments

A

L4-S3

25
Q

tibial nerve segments

A

L4-S3

26
Q

common fibular nerve segments

A

L4-S2

27
Q

lateral femoral cutaneous nerve segments

A

L2-L3

28
Q

Posterior femoral cutaneous nerve segments

A

S1-S3

MSK 1!!! (10 decks)

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