Brainscape's Knowledge GenomeTM

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


See full index

MRCS Anatomy - Upper Limb > Brachial Plexus > Flashcards

Brachial Plexus Flashcards

1
Q

What are the divisions of the brachial plexus

A 
Roots
Trunks
Divisions
Cords
Branches
Read That Damn Cadaver Book
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What forms the roots of the brachial plexus

A

Anterior divisions of spinal nerves C5-T1

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

What do the posterior divisions of C5-T1 do

A

Innervate skin and musculature of trunk

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

Where do the roots of the brachial plexus pass

A

Between anterior and medial scalene muscles to enter base of neck

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

What are the three trunks of the brachial plexus

A

Superior trunk
Middle trunk
Inferior trunk

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

Where do the roots of the brachial plexus converge and form trunks

A

Base of the neck

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

What forms the superior trunk of the brachial plexus

A

Combination of C5 and C6 roots

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

What forms the middle trunk of the brachial plexus

A

Continuation of C7 root

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

What forms the inferior trunk of the brachial plexus

A

Combination of C8 and T1 roots

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

Where do the trunks of the brachial plexus move once formed

A

Laterally, crossing posterior triangle of the neck

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

What happens to the brachial plexus in the posterior triangle of the neck

A

Each trunk divides into two branches - anterior and posterior divisions

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

Where do the divisions of the brachial plexus then pass

A

Leave the posterior triangle and pass into the axilla

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

When do the divisions of the brachial plexus recombine to form cords

A

Once they have entered the axilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the cords of the brachial plexus

A

Lateral cord
Posterior cord
Medial cord

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

What forms the lateral cord of the brachial plexus

A

Anterior division of superior trunk

Anterior division of middle trunk

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

What forms the posterior cord of the brachial plexus

A

Posterior division of superior trunk
Posterior division of middle trunk
Posterior division of inferior trunk

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

What forms the medial cord of the brachial plexus

A

Anterior division of the inferior trunk

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

Where do the cords give rise to the branches of the brachial plexus

A

In the axilla and proximal aspect of the upper limb

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

What are the branches of the brachial plexus

A 
Musculocutaneous
Axillary
Median
Radial 
Ulnar
20
Q

What roots form musculocutaneous nerve

A

C5, C6, C7

21
Q

What are the motor functions of musculocutaneous nerve

A

Innervates brachialis, biceps brachii and coracobrachialis

22
Q

What are the sensory functions of the musculocutaneous nerve

A

Gives off lateral cutaneous branch of the forearm:-
Innervates lateral half of anterior forearm
Innervates small lateral portion of posterior forearm

23
Q

What roots make up the axillary nerve

A

C5 and C6

24
Q

What are the motor functions of the axillary nerve

A

Innervates teres minor and deltoid muscles

25
Q

What are the sensory functions of the axillary nerve

A

Gives off superior lateral cutaneous nerve of the arm:-

Innervates inferior region of deltoid

26
Q

What are the roots of the median nerve

A

C6-T1

27
Q

What are the motor functions of the median nerve

A

Flexor muscles of the forearm
Thenar muscles
Two lateral lumbricals

28
Q

What are the sensory functions of the median nerve

A

Gives off palmar cutaneous branch - innervates lateral part of palm
Gives off digital cutaneous branch - innervates lateral three and a half fingers on palmar surface of hand

29
Q

What are the roots of the radial nerve

A

C5-8 and T1

30
Q

What are the motor functions of the radial nerve

A

Triceps brachii

Extensor muscle in the posterior compartment of the forearm

31
Q

What are the sensory functions of the radial nerve

A

Posterior aspect of arm and forearm

Posterior, lateral aspect of hand

32
Q

What are the roots of the ulnar nerve

A

C8 and T1

33
Q

What are the motor functions of the ulnar nerve

A

Muscles of the hand (except thenar muscles and lateral two lumbricals)
Flexor carpi ulnaris
Medial half of flexor digitorum profundus

34
Q

What are the sensory functions of the ulnar nerve

A

Anterior and posterior surfaces of medial one and a half fingers
Associated palm area

35
Q

What minor branches arise from the roots of the brachial plexus

A

Dorsal scapular nerve

Long thoracic nerve

36
Q

What minor branches arise from the trunks of the brachial plexus

A

Suprascapular nerve

Nerve to subclavius

37
Q

What minor branches arise from the lateral cord of the brachial plexus

A

Lateral pectoral nerve

38
Q

What minor branches arise from the medial cord of the brachial plexus

A

Medial pectoral nerve
Medial cutaneous nerve of arm
Medial cutaneous nerve of forearm

39
Q

What minor branches arise from the posterior cord of the brachial plexus

A

Superior subscapular nerve
Thoracodorsal nerve
Inferior subscapular nerve

40
Q

What nerves are affected in an Erb’s palsy

A 
Nerves from C5 and C6 roots:
Musculocutaneous nerve
Axillary nerve
Suprascapular nerve
Nerve to subclavius
41
Q

What muscles are paralysed in Erb’s palsy

A 
Supraspinatus
Infraspinatus
Subclavius
Biceps brachii
Brachialis
Coracobrachialis
Deltoid
Teres minor
42
Q

Which movements are lost/greatly weakened

A

Abduction at shoulder
Exteral rotation of arm
Supination of forearm
Flexion at shoulder

43
Q

Where is the sensation loss in Erb’s palsy

A

Down lateral side of arm

44
Q

What mechanism of injury causes Klumpke palsy

A

Excessive abduction of the arm

45
Q

What nerves are affected in Klumpke palsy

A

Nerves from T1 root:
Ulna nerve
Median nerve

46
Q

What muscles are paralysed in Klumpke palsy

A

All small muscles of the hand

MCPJs hyperextended and IPJs are flexed giving clawed appearance

47
Q

What sensory loss is associated with Klumpke palsy

A

Loss of sensation along medial side of arm

MRCS Anatomy - Upper Limb (33 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions