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Human Form & Function > Brachial/Cephalic Plexus > Flashcards

Brachial/Cephalic Plexus Flashcards

1
Q

what spinal cord levels make up the brachial plexus?

A

C5-T1

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2
Q

brachial plexus supplies the ____ and ____ innervation to the ___ ____

A

motor and sensory innervation to upper limb

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3
Q

order of brachial plexus (cords, branches, etc.)

A

roots
trunks
divisions
cords
branches
“Rugby Teams Drink Cold Beverages”

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4
Q

roots of brachial plexus are the ___ ___ of C5-T1

A

ventral rami

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5
Q

roots = ventral ___

A

rami

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6
Q

C5-C8 roots course ___ associated vertebrae

A

above

8 C spinal nerves and only 7 C vertebrae

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7
Q

each brachial plexus root has an associated ____ and ____

A

dermatome and myotome

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8
Q

how many brachial plexus trunks are there? names?

A

3
upper (C5-6), middle (C7), lower (C8-T1)

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9
Q

what trunk does the suprascapular nerve branch from?

A

upper trunk

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10
Q

where do the roots/trunks of the brachial plexus exit?

A

between the anterior and middle scalene muscles

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11
Q

how many divisions of the brachial plexus are there?

A

6

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12
Q

anterior divisions of brachial plexus =
posterior divisions of brachial plexus =

A

anterior divisions of BP = flexors

posterior divisions of BP= extensors

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13
Q

how many cords are there in the brachial plexus?

A

three

lateral
medial
posterior

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14
Q

study

A
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15
Q

what spinal cord levels make the cervical plexus?

A

C1-C4

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16
Q
A
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17
Q

study

A
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18
Q

cutaneous branches of the cervical plexus (4)

A

lesser occipital n.
great auricular n.
transverse cervical n.
supraclavicular n.

19
Q

what is a plexus?

A

ventral rami joining and collectively innervating a region

brachial plexus - upper limbs

20
Q

what froms a plexus?

A

ventral rami

21
Q
A

red: sensory
purple: motor (diaphragm)
green: mostly motor

22
Q

What’s the first muscle that you need to remove to see the cervical plexus?

A

platysma

23
Q

as we descend the cervical region, do the ventral rami get bigger or smaller?

A

bigger

24
Q

sensory branches = _____ to SCM
motor branches = _____to SCM

A

sensory = superficial to SCM
motor = deep to SCM

25
Q

cutaneous branches of the cervical plexus

A

lesser occipital n
greater auricular n
transverse cervical n
supraclavicular n

26
Q

what spinal level do the cutaneous branches belong to?
lesser occipital n
greater auricular n
transverse cervical n
supraclavicular n

A

lesser occipital n (C2)

greater auricular n (C2, C3)

transverse cervical n (C2, C3)

supraclavicular n (C3, C4)

27
Q

greater occipital n =
lesser occipital n =

A

greater occipital n = dorsal rami
lesser occipital n = ventral rami

28
Q

what levels do the greater, lesser, and least occipital nerves come from?

A

greater and lesser from C2

least from C3

29
Q

what levels do the greater and lesser occipital nerves come from?

A

BOTH from C2

greater is a dorsal rami
lesser is ventral rami

30
Q

motor nerves of the cervical plexus

A
  • thyrohyoid
  • geniohyoid
  • ansa cervicalis
    – superior and inferior roots
  • superior belly of omohyoid
  • sternothyroid
  • sternohyoid
  • inferior belly of omohyoid
31
Q

ansa cervicalis: superior root comes from level ___

A

C1

32
Q

ansa cervicalis: inferior root comes from levels ___

A

C2 and C3

33
Q

phrenic nerve comes from what levels

A

C3
C4
C5

34
Q

what are the three nerves of the brachial plexus (that I need to know)?

A

medial
ulnar
radial

35
Q

what do the brachial plexus nerves do?

A

medial: flex wrist, thumb, and digits (minus pinky)
*carpal tunnel

ulnar: flex pinky/ring finger and wrist
*funny bone

radial: extend arm, elbow, wrist

36
Q
A
37
Q
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38
Q
A
39
Q
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40
Q
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41
Q
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42
Q
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43
Q
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44
Q
A

Human Form & Function (40 decks)

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