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MSK > Dermatomes And Myotomes Of The Upper Limb > Flashcards

Dermatomes And Myotomes Of The Upper Limb Flashcards

1
Q

What do somites differentiate into?

A

Sclerotome
Dermatomyotome

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2
Q

What does a sclerotome form?

A

Vertebrae and ribs

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3
Q

What does dermatomyotome form?

A

Muscle and dermis of skin

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4
Q

What does skin and muscle derived from a single dermatomyotome have in common?

A

Spinal nerve supply

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5
Q

What is a myotome?

A

Group of muscles supplied by a single spinal nerve

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6
Q

What is a Dermatome?

A

Area of skin supplied by a single spinal nerve

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7
Q

What is a spinal nerve made up of?

A

Both sensory and motor axons

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8
Q

Where are spinal nerves found?

A

Intervertebral Foramen

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9
Q

Where do the C1-C7 cervical nerves emerge with respect to their associated vertebrae?

A

Above their vertebrae

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10
Q

Where does the C8 spinal nerve exit the spinal canal?

A

Between C7 and T1
Below C7 above T1

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11
Q

Where do the T1-L5 spinal nerves exit with respect to their corresponding vertebrae?

A

Below their vertebrae

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12
Q

Where do the S1-S4 spinal nerves exit?

A

Via 4 pairs of sacral foramina

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13
Q

Where does the S5 and Co1 spinal nerves exit?

A

Via sacral hiatus posteriorly

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14
Q

What are the names of the bones where the C1 spinal nerve emerges between?

A

Occipital bone and atlas (C1)

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15
Q

What do spinal nerves branch into once they’ve emerged from the spinal cord?

A

Posterior/dorsal ramus
Anterior/ventral ramus

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16
Q

What part of the body do the anterior/ventral rami supply?

A

Muscles and skin of upper and lower limbs
Lateral and ventral trunk (Front and sides)

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17
Q

What part of the body do the posterior/dorsal rami supply?

A

Deep muscles and skin of dorsal trunk

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18
Q

There is a junction between C4 and T2, how do the C5-T1 nerve roots supply the upper limbs?

A

Via the Brachial plexus

19
Q

What spinal nerve roots make up the Brachial plexus?

A

C5-T1

20
Q

Where is the C4 Dermatome?

A

Top of chest spans towards shoulders

21
Q

Where is the C5 dermatome?

A

RADIAL ASPECT (Lateral portion of arm when in anatomical position)
From the shoulder, stops just before elbow joint

22
Q

Where is the C6 Dermatome?

A

Cross elbow joint from arm to forearm
RADIAL aspect (Lateral aspect) of forearm and supplies THUMB and INDEX finger

23
Q

Where is the C7 dermatome?

A

The MIDDLE FINGER
C7 to heaven

24
Q

Where is the C8 dermatome?

A

RING and LITTLE finger
Moves slightly onto ULNAR aspect of forearm

25
Q

Where is the T1 Dermatome?

A

ULNAR aspect of the forearm just past the elbow joint/cubital fossa

26
Q

Where is the T2 Dermatome?

A

ULNAR aspect of the arm and the UPPER chest

27
Q

What is the name of the structure where rearrangement of the ventral rami of spinal nerves occur producing peripheral nerves?

A

Plexuses

28
Q

What often makes up a peripheral nerve?

A

Axons from several spinal nerves
Axons from one spinal nerve can enter multiple peripheral nerves

29
Q

What peripheral nerves does C6 supply?

A

Musculocutaneous nerve
Axillary
Radial nerve
Median nerve

30
Q

What are the spinal nerve roots supplying the musuculocutaneus nerve?

A

C5, C6 and (C7)

C7 has very little contribution

31
Q

What is special about the C5 fibres that supply the musculocutaneous nerve?

A

They are all motor fibres
No sensory input from C5

32
Q

What are peripheral nerve territories?

A

Areas of skin supplied by the peripheral nerves

They are NOT the same as Dermatome

33
Q

What plexus is responsible for peripheral nerve formation in the upper limbs?

A

Brachial plexus

34
Q

What plexus is responsible for peripheral nerve formation in the lower limbs?

A

Lumbosacral plexus

35
Q

What spinal nerves make up the femoral nerve? (Lumbosacral plexus)

A

L2, L3, L4

36
Q

What are the 2 major branches of the femoral nerve?

A

Anterior femoral cutaneous nerve
Saphenous nerve

37
Q

Where does the saphenous nerve cover?

A

Medial leg below the knee

38
Q

Where does the anterior Femoral cutaneous nerve cover?

A

Knee and anterior thigh

39
Q

What are the 5 spinal nerve roots that supply the upper limbs via the brachial plexus?

A

C5
C6
C7
C8
T1

40
Q

What is the function of the C5 myotome?

A

Shoulder ABduction
Shoulder external rotation

41
Q

What is the function of the C6 myotome?

A

Elbow Flexion
Wrist extension
Supination (Neutral position then turn palm to the ceiling)

42
Q

What is the function of the C7 myotome?

A

Elbow extension
Wrist Flexion
Pronation (opposite of supination)

43
Q

What is the function of the C8 myotome?

A

Finger Flexion
Finger extension

44
Q

What is the function of the T1 myotome?

A

Finger ABduction
Finger ADduction

MSK (36 decks)

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