Brainscape's Knowledge GenomeTM

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


See full index

Anatomy > Brachial Plexus > Flashcards

Brachial Plexus Flashcards

1
Q

What is the brachial plexus?

A

A spaghetti-like network of nerves in the axilla that controls movement and sensation in the upper extremity

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

Draw the brachial plexus.

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

What does MARMU stand for?

A

Musculocutaneous Nerve

Axillary Nerve

Radial Nerve

Medial Nerve

Ulnar Nerve

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

Describe how the name of the subclavian artery changes as it moves towards the brachial plexus.

A

It starts as the subclavian artery until it crosses the 1st rib, where it then becomes the axillary artery until it crosses the teres major where it becomes the brachial artery.

THEY ARE ALL THE SAME ARTERY TUBE

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

What is the largest artery coming off of the axillary artery?

A

Subscapular Artery

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

What is the largest nerve off the brachial plexus?

A

Radial Nerve

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

Describe how the brachial plexus is divided into sections.

A

Roots

Trunks

Divisions

Cords

Branches

“Real teachers drink cold beer.”

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

What nerves are found in the roots of the brachial plexus?

A

Dorsal Scapular

Long Thoracic

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

What nerves are found in the trunks of the brachial plexus?

A

Subclavian

Suprascapular

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

What nerves are found in the divisions of the brachial plexus?

A

None

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

What nerves are found in the cords of the brachial plexus?

A

Superior: Lateral Pectoral

Middle: Lower Subscapular, Middle Subscapular (thoracodorsal) and Upper Subscapular

Inferior: Medial Antebrachial Cutaneous, Medial Brachial Cutaneous and Medial Pectoral

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

What nerves are found in the branches of the brachial plexus?

A

Musculocutaneous

Axillary

Radial

Medial

Ulnar

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

What does the musculocutaneous nerve innervate?

A

Short head of the biceps

Brachialis

Coracobrachialis

“BBC”

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

What is the middle subscapular nerve also known as?

A

Thoracodorsal Nerve

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

What does the long thoracic nerve innervate?

A

Serratus Anterior

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

What does the dorsal scapular nerve innervate?

A

Rhomboids and levator scapulae

17
Q

What does the suprascapular nerve innervate?

A

Supraspinatus and infraspinatus

18
Q

What does the subclavian nerve innervate?

A

Subclavius

19
Q

What does the lateral pectoral nerve innervate?

A

One of the two nerves innervating the pectoralis major

20
Q

What does the medial pectoral nerve innervate?

A

The pectoralis major and minor

21
Q

What does the upper subscapular nerve innervate?

A

One of the nerves that innervates the subscapularis muscle

22
Q

What does the lower subscapular nerve innervate?

A

One of the nerves that innervates the subscapularis muscle and the teres major

23
Q

What does the middle subscapular (thoracodorsal) nerve innervate?

A

Latissimus dorsi

24
Q

What does upper root damage cause?

A

Erb’s Palsy - results in the “tipper’s hand”

25
Q

What does lower root damage cause?

What may look like lower root damage but actually is not?

A

Klumpke’s Palsy - manifests as a claw hand

True claw is caused by a lower root injury that results in damage to the radial, median and ulnar branches

True ulnar claw is caused by distal damage to the ulnar nerve and NOT damage to the root which paralyzes the median 2 lumbricals responsible for moving the ring finger and the pinky

26
Q

Describe the “pope’s blessing” and its difference from the true ulnar claw.

A

Both look the same but the “pope’s blessing” is only seen in active flexion while the true ulnar claw is seen passively. The “pope’s blessing” is caused by median nerve damage rather than ulnar nerve damage.

The problem in this case is flexion of the lateral fingers, not the ring finger and the pinky but the index and middle fingers.

27
Q

What are the contributions of the musculocutaneous nerve?

A

C5, C6 and C7

Three musketeers

28
Q

What are the contributions of the axillary nerve?

A

C5 and C6

Assassinated

29
Q

What are the contributions of the radial nerve?

A

C5, C6, C7, C8 and T1

Five Rats

30
Q

What are the contributions of the median nerve?

A

C5, C6, C7, C8 and T1

Five mice

31
Q

What are the contributions of the ulnar nerve?

A

C8 and T1

Two unicorns

32
Q

What would injury to the inferior trunk affect?

A

The inferior trunk is C8 and T1 so it would affect the ulnar nerve.

33
Q

What would injury to the middle trunk affect?

A

The middle trunk is C7 so it would affect the middle finger, however there are no no nerve branches that arise directly from the middle trunk and isolated middle trunk injury is rare.

34
Q

What would injury to the superior trunk affect?

A

The superior trunk is C5 and C6 so it would affect all muscles with C5-C6 innervation and the index finger and the thumb.

35
Q

Which is the brachial plexus largely made up of, dorsal or ventral rami?

A

Ventral Rami

Anatomy (41 decks)

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