Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ANAT102 > Topic 6: Nerve supply of the Upper Limb > Flashcards

Topic 6: Nerve supply of the Upper Limb Flashcards

1
Q

What is a plexus?

A

Complex plait of nerves originating from ventral rami of spinal nerves
–> ventral rami = anterior divisions of spinal nerves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does a plexus do?

A

redistributes nerve fibres from several spinal levels BEFORE forming peripheral nerves
–> gives some redundancy of nerve supply

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Parts of the Brachial plexus

A
  1. roots
  2. trunks
  3. divisions
  4. cords
  5. branches
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What does the Brachial plexus supply

A

all muscles of the upper limb

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Root values of the brachial plexus

A

C5-T1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

TRUNKS

1. Upper

A

merges from the C5 &6 roots

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

TRUNKS

2. middle

A

comes from the root C7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

TRUNKS

3. lower

A

merges from the root values C8 & T1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

DIVISIONS

A

anterior & posterior divisions that come off trunks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

CORDS

1. lateral cord

A
  • lateral to axillary artery

- merge of the anterior divisions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

CORDS

2. posterior cord

A
  • posterior to the axillary artery

- merge of the posterior divisions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

CORDS

3. Medial

A
  • medial to the axillary artery

- originates just from the anterior division off the lower trunk

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

BRANCHES

A
  1. Musculocutaneous nerve
  2. axillary nerve
  3. radial nerve
  4. median nerve
  5. ulnar nerve
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

ORIENTATION

Where do the roots emerge between?

A

between scalene (neck) muscles (anterior & middle)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

ORIENTATION

Where are the trunks?

A

superior to the clavicle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

ORIENTATION

Cords

A
  • inferior to the clavicle

- named by their position relative to axillary artery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Branches from the roots & distribution

1. Dorsal scapular

A

rhomboids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Branches from the roots & distribution

2. Long thoracic (C5-C7)

A

serratus anterior

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Branches from the trunks & their dist

1. suprascapular nerve

A

supraspinatus, infraspinatus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Branches from the trunks & their dist

2. nerve to subclavius nerve

A

Subclavius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

How many branches are there from cords?

A

14

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

branches from cords(not peripheral)

A
  1. upper subscapular
  2. lower subscapular
  3. thoracodorsal
  4. medial cutaneous nerve of arm
  5. medial cutaneous nerve of forearm
  6. medial pectoral
  7. lateral pectoral
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Branches from the cords (peripheral)

A
  1. axillary
  2. radial & posterior interosseus branch (PIN - pins supinator)
  3. musculocutaneous
  4. median and its anterior interosseus branch
  5. ulnar
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

THE BIG FIVE

1. Musculocutaneous

A

First branch; only goes to anterior arm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

THE BIG FIVE

2. Axillary nerve

A

Next; dives deep into axilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

THE BIG FIVE

3. Radial nerve

A

Next; dives deep between heads of triceps (find out which heads)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

THE BIG FIVE

4. Median nerve

A
  • formed by 2 cords (posterior & medial)

- runs straight down midline of anterior arm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

THE BIG FIVE

5. Ulnar

A

most inferior branch formed by only one cord (medial)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Axillary Nerve root value

A

C5,6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Axillary Nerve motor distribution

A

deltoid, teres minor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Axillary Nerve sensory distribution

A

skin over deltoid, shoulder jt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Radial nerve root value

A

C5-T1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Radial nerve motor distribution

A

all UL extensors, brachoradialis, supinator, AbdPL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Radial nerve sensory distribution

A
  • skin of the posterior arm, forearm and hand (lateral 3.5 digits), wrist & elbow jts
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Musculocutaneous root value

A

C5,6,7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Musculocutaneous motor distribution

A

coracobrachialis, biceps brachii, brachialis

37
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Musculocutaneous sensory distribution

A
  • skin of lateral forearm to base of thumb (via the lateral cutaneous nerve of the forearm), elbow jt
38
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Median nerve root value

39
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Median nerve motor distribution

A

FCR, PL, both pronators, FDS, FDP (lat), FPL, AbdPB, FPB, OppPoll, lat 2 lumbricals
HALF LOAF

40
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Median nerve sensory distribution

A
  • skin of the lateral 3.5 digits and corresponding palm, wrist and elbow jts
41
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Ulnar nerve RV

42
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Ulnar nerve motor dist

A

FCU, FDP(medial), PB, AbdDM, FDM, OppDM, med 2 lumbricals, addPoll, all interossei

43
Q

DISTRIBUTION OF THE BRANCHES OF THE BRACHIAL PLEXUS

Ulnar nerve sensory dist

A

skin of the medial 1.5 digits and corresponding palm, wrist jt

44
Q

Where does the musculocutaneous nerve originate from?

A

the lateral cord (C5-C7)

45
Q

Course of the musculocutaneous nerve

A
  1. starts lateral to axillary artery
  2. descends & pierces the corachobrachialis
  3. runs between biceps & brachialis
46
Q

Branches of the musc nerve

A

lateral cutaneous nerve of forearm

47
Q

Vulnerable sites

A
  • not especially vulnerable to injury

- injuries @ birth could be a cause

48
Q

Where does the axillary nerve originate from?

A

posterior cord (C5-6)

49
Q

Course of the axillary nerve

A
  • starts posterior to axillary artery
  • dives deep into shoulder (quad space)
  • supplies shoulder jt
  • ant branch winds around neck of humerus to supply deltoid
  • post branch to supply deltoid & teres minor
50
Q

What does the ant branch of the axillary nerve supply

A

winds around neck of humerus to supply deltoid

51
Q

What does post branch of axillary nerve supply?

A

deltoid & teres minor

52
Q

Branches of the axillary nerve

A

superior/ upper lateral cutaneous nerve of arm (vaccine area)

53
Q

Axillary nerve vulnerable to injury

A

shoulder dislocation (because wraps around humeral neck)

54
Q

Where does the radial nerve originate from?

A

posterior cord (C5-T1)

55
Q

Course of the radial nerve

A
  • lies posterior to axillary artery
  • ducks deep between lat & med heads of triceps brachii
  • travels in radial groove on humerus
  • enters anterior arm between brachioradialis & brachialis (cubital fossa)
  • crosses elbow joint anteriorly & divides
56
Q

Branches of radial nerve

1. deep branch radial/ posterior interosseus nerve

A
  • pierces supinator
  • then runs along posterior surface of interosseus membrane
  • travels into posterior forearm & innervates everything
57
Q

Branches of the radial nerve

2. superficial branch radial

A

only innervates skin & jts

58
Q

Injury of the radial nerve

A
  • fracture of humerus (radial groove)
  • incorrect technique with crutches
  • arcade of Frohse
  • –> entrapment between supinator heads
59
Q

Where does the median nerve originate from

A
  • lateral cord (C5-C7)

- medial cord (C8-T1)

60
Q

Where do median nerve cords unite?

A

anterior to axillary artery

61
Q

Where does the median nerve travel?

A

deep to biceps brachii

62
Q

what muscle does the median nerve travel on top of?

A

brachialis

63
Q

What accessory structure does Median nerve travel deep to?

A

deep to bicipital aponeurosis in cubital fossa

64
Q

What muscle does Med nerve run between

A

between heads of pronator teres

- then deep to FDS

65
Q

what accessory structure does the median nerve travel deep to to enter the hand?

A

the flexor retinaculum via carpal tunnel

66
Q

ulnar nerve originates from:

A

medial cord (root value C8-T1)

67
Q

what muscle does the ulnar nerve travel anterior to?

A

triceps brachii

68
Q

what landmarks does the ulnar nerve travel in between (near elbow)?

A

between the medial epicondyle of the humerus and the olecranon

69
Q

how does the ulnar nerve enter the anterior forearm?

A

by passing through heads of FCU

70
Q

what muscle does ulnar nerve run along lateral to ulnar artery?

71
Q

how does the ulnar nerve enter the hand?

A

by passing anterior to flexor retinaculum just lateral to the pisiform

72
Q

Branch of the median nerve

A

interosseous branch

73
Q

where is the anterior interosseus branch of the median nerve formed?

A

cubital fossa

74
Q

where does the anterior interosseous branch of the median nerve travel?

A

on anterior surface of interosseous membrane

75
Q

injury of the median nerve:

A
  • deep cuts to the forearm
  • superficial cut at wrist
  • entrapment between heads of pronator teres
  • carpal tunnel syndrome
76
Q

injury of ulnar nerve:

A
  • at the groove behind the medial epicondyle
  • superficial cut at wrist
  • fall onto hand/ compression in Guyon’s canal (between hook of hamate & pisiform)
77
Q

SMALLER BRANCHES
Branches from the cords
Lateral pectoral nerve

A

innervates pectoralis major

- from lateral cord

78
Q

BRANCHES FROM THE CORDS

Upper subscapular

A

subscapularis

- posterior cord

79
Q

BRANCHES FROM THE CORDS

Thoracodorsal

A

Lat dorsi

- posterior cord

80
Q

BRANCHES FROM THE CORDS

Lower subscap

A

lower subscapularis & teres minor

- posterior cord

81
Q

BRANCHES FROM CORDS - MEDIAL CORD

A
  1. medial pectoral nerve (pec minor & part of major)
  2. medial cutaneous nerve of Arm
  3. medial cutaneous nerve of forearm
82
Q

BRANCHES FROM THE ROOTS

1. dorsal scapular

83
Q

BRANCHES FROM THE ROOTS

2. long thoracic

A

serratus anterior

84
Q

BRANCHES FROM THE TRUNKS

1. suprascapular

A

supraspinatus, infraspinatus (comes from superior trunk)

85
Q

BRANCHES FROM THE TRUNKS

2. nerve to subclavius

A

subclavius (comes from superior trunk)

86
Q

what is the nerve entering corachobrachialis?

A

musculocutaneous nerve

87
Q

nerves of the “M”

A
  1. musculocutaneous
  2. median nerve
  3. ulnar nerve
88
Q

what are the feet of the “m”

A

medial and lateral cords

ANAT102 (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions