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PT602 > Brachial Plexus > Flashcards

Brachial Plexus Flashcards

1
Q

Brachial plexus

A

network of somatic nerves formed by union of cervical ventral rami C5-T1

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2
Q

All somatic plexuses are formed by:

A

ventral rami of spinal nerves

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3
Q

responsible for:

A

innervating most of the upper limb

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4
Q

originates:
runs:

A

in the cervical region
distal - laterally
inferior to the clavicle
enters the axilla

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5
Q

5 Major components

A 
Roots (the ventral rami of spinal nerves)
Trunks (superior, middle, inferior)
Divisions (anterior, posterior)
Cords (medial, lateral, posterior)
Terminal Nerves (aka terminal branches)
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6
Q

Roots

A

ventral rami from spinal nerves C5-T1

variable contributions from C4 and T2

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7
Q

Roots carry both:

A

somatomotor and somatosensory fibers

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8
Q

Roots emerge from:

A

in the neck between the anterior scalene and middle scalene muscles

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9
Q

Roots give off:

A 
the dorsal scapular nerve (C5)
long thoracic nerve (C5-C7)
phrenic nerve (supplies the diaphragm)
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10
Q

Roots unite to form

A

three trunks
upper, middle, lower trunks
proximal to clavicle

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11
Q

Upper trunk formed by:

A

union of ventral rami C5-C6

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12
Q

Lower trunk formed by:

A

union of ventral rami C8-T1

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13
Q

Middle trunk formed by:

A

ventral ramus of C7

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14
Q

Upper trunk only trunk that:

A

gives rise to nerve branches

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15
Q

those nerve branches are

A
  1. Suprascapular nerve (supplies Supra&Infraspinatus)

2. Nerve to subclavius

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16
Q

Three Trunks split into

A

divisions

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17
Q

Divisions have

A

anterior division

posterior division

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18
Q

may be:

A

proximal to the clavicle or

between the clavicle and first rib

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19
Q

there are no

A

branches formed off the divisions

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20
Q

Three cords are:

named according to:

A

Lateral, Medial, Posterior

according to their position relative to the axillary artery (major artery to the upper limb)

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21
Q

It becomes the axillary artery when:

A

the subclavian artery emerges distal-laterally from under the clavicle

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22
Q

Cords generally run:

A

deep to the clavicle &

deep to the tendon of insertion of the pec minor

23
Q

Lateral cord gives off one branch

A

lateral pectoral nerve

24
Q

Medial cord gives off three branches

A
  1. medial pectoral nerve
  2. medial brachial cutaneous nerve
  3. medial antebrachial cutaneous nerve
25
Q

medial pectoral nerve supplies:

A

pectoralis major and minor

26
Q

cutaneous nerves convey

A

sensory information from the skin only

27
Q

Posterior cord gives off three branches

A
  1. upper subscapular nerve
  2. thoracodorsal nerve
  3. lower subscapular nerve
28
Q

Upper subscapular nerve supplies:

A

subscapularis

29
Q

Thoracodorasal nerve supplies:

A

latissimus dorsi

30
Q

Lower subscapular nerves supplies:

A
  1. subscapularis

2. teres major

31
Q

Terminal nerves
how many?
provide:

A

5

provide innervation to the remainder of the upper limb

32
Q

5 Terminal Nerves

A
  1. Musculocutaneous
  2. Median
  3. Radian
  4. Axillary
  5. Ulnar
33
Q

Musculocutaneous nerve derives from:

A

lateral cord

34
Q

Median nerve derives from:

A

both lateral and medial cords

35
Q

Radial and axillary nerve derive from:

A

posterior cord

36
Q

axillary nerve supplies:

then terminates:

A

supplies: teres minor and deltoid
terminates: upper lateral brachial cutaneous nerve

37
Q

Spinal cord contributions to each of these terminal nerves:

A

grays anatomy pg 364

38
Q

Axillary nerve travels

A

leaves the posterior cord of plexus, runs posteriorly through the axilla, inferior to the humeral head, exits the quadrangular space to supply teres minor and deltoid, then terminates as a cutaneous nerve

39
Q

musculotaneous nerves is innervated by

A

C5
C6
C7

40
Q

Axillary nerves is innervated by

A

C5

C6

41
Q

Radial nerve is innervated by

A 
C5
C6
C7
C8
T1
42
Q

Median nerve is innervated by

A 
C5
C6
C7
C8
T1
43
Q

Ulnar nerve is innervated by

A

C7
C8
T1

44
Q

dorsal scapular nerve

A

C5

45
Q

Long thoracic

A

C5
C6
C7

46
Q

Suprascapular nerve

A

C5

C6

47
Q

nerve to Subclavius

A

C5

C6

48
Q

Lateral pectoral nerve

A

C5
C6
C7

49
Q

Medial Pectoral nerve

A

C8

T1

50
Q

Medial cutaneous of arm nerve

A

C8

T1

51
Q

Medial cutaneous of forearm nerve

A

C8

T1

52
Q

Superior Subscapular nerve

A

C5

C6

53
Q

Thoracodorsal nerve

A

C6
C7
C8

54
Q

Inferior Subscapular nerve

A

C5

C6

PT602 (15 decks)

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