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MSK Exam I > Dermatomes, Myotomes And Plexuses > Flashcards

Dermatomes, Myotomes And Plexuses Flashcards

1
Q

What does intermediate mesoderm give rise to?

A

Kidneys and gonads

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2
Q

What does paraxial mesoderm give rise to?

A

Head and somites

Somites then give rise to sclerotome (cartilage), myotome (skeletal muscle) and dermatome (dermis)

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3
Q

What does the lateral mesoderm give rise to?

A

Splanchnic (circulatory system), somatic (body cavity, pelvis and limb bones) and extraembryonic structures

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4
Q

What does the dermatome give rise to?

A

Dermis

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5
Q

What does the myotome give rise to?

A

Muscle

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6
Q

What does the sclerotome give rise to?

A

Cartilage; vertebrae and ribs

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7
Q

Cells that migrate anteriorly give rise to what during development?

A

Muscles of the limbs and trunk (hypaxial muscles) and to the associated dermis

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8
Q

Cells that migrate posteriorly give rise to what during development?

A

Intrinsic muscles of the back (epaxial muscles) and the associated dermis

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9
Q

The posterior horn is what?

A

Sensory

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10
Q

The lateral horn of the spinal cord is what?

A

Visceromotor

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11
Q

The anterior horn of the spinal cord is what?

A

Motor

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12
Q

The anterior and posterior rootlets are differentiated, however once they combine to form a spinal nerve they become what?

A

Undifferentiated

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13
Q

When does limb development begin?

A

During week 4 (involves rotation and bending)

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14
Q

What is a dermatome?

A

The area of skin supplied with afferent nerve fibers by a single posterior spinal root

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15
Q

What is the difference between dermatome maps and nerve maps?

A

For every dermatome region there is a single dorsal root contributor
However named nerves have more than one rami contribution

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16
Q

What are myotomes?

A

All the muscles that are innervated by a single efferent anterior root

17
Q

Most muscles are composed of what?

A

More than one myotome*

18
Q

What is monosegmental muscle innervation?

A

One myotome contribution

19
Q

What is multisegmental muscle innervation?

A

Multiple myotome contributions

20
Q

Injury to a dorsal root will lead to what?

A

Only to sensory deficits/symptoms (e.g. paresthesia)

21
Q

Injury to a ventral root will lead to what?

A

Only to motor deficits (e.g. weakness)

22
Q

Impingement or injury that affects a single segment can be ascertained with some degree of certainty by what?

A

Turning to a dermatome map

23
Q

Impingement or injury that effects a single nerve proper can be ascertained with some degree of certainty by what?

A

Turning to a nerve map

24
Q

What is the caveat with dermatomes and dermatome maps?

A

Dermatomes are not as precise as shown on dermatome maps and consist of segments/nerves with overlapping territories

25
Q

The fact that one muscle may be composed of multiple dermatomes (one myotome may contribute to multiple muscles) means what?

A

That impingement or injury to one segment will probably lead to weakness and not a complete loss of function

26
Q

What is the basic spinal innervation pattern for the spinal cord?

A

Dorsal and ventral roots

27
Q

What is the basic spinal innervation pattern for spinal nerves?

A

Dorsal and ventral rami

28
Q

What are the branches of the lumbosacral plexus?

A

Femoral, obturator, sciatic, lateral formal cutaneous and posterior femoral cutaneous nerves

29
Q

What is the spinal root for the femoral nerve?

A

L2-L4

30
Q

What is the spinal root for the obturator nerve?

A

L2-L4

31
Q

What is the spinal root for the sciatic nerve?

A

L4-S3

32
Q

What is the spinal root for the tibial nerve (of sciatic nerve)?

A

L4-S3

33
Q

What is the spinal root for the common fibular nerve (of sciatic nerve)?

A

L4-S2

34
Q

What is the spinal root for the lateral femoral cutaneous nerve?

A

L2-3

35
Q

What is the spinal root for the posterior femoral cutaneous nerve?

A

S1-S3

MSK Exam I (34 decks)

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