Lecture 15: Upper Extremity Neurology Flashcards Preview

Year 1: 03. MSK Exam 1 > Lecture 15: Upper Extremity Neurology > Flashcards

Flashcards in Lecture 15: Upper Extremity Neurology Deck (44)
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1

What innervates the skin of the neck and shoulder?

Supraclavicular Nerves

(Nerves of the Cervical Plexus)

2

What are the three major divisions of the Lateral Cord of the Brachial Plexus?

Lateral Pectoral Nerve

Musculocutaneous Nerve

1/2 of the Median Nerve

 

3

What are the branches and terminal divisions of the Posterior Cord of the Brachial Plexus?

Branches: Inferior Subscapular, Superior Subscapular, and Thoracodorsal

Terminal Branches: Axillary Nerve, Radial Nerve

4

What are the three branches and two terminal branches of the Medial Cord?

Branches: Medial Pectoral, Medial Brachial Cutaneous, Medial Antebrachial Cutaneous.

 

Terminal Branches: Ulnar Nerve and 1/2 of the Median Nerve

5

What Nerves come directly off the Root of C5?

Dorsal Scapular Nerve

Long Thoracic

6

Dorsal Scapular Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Rhomboid Muscles and Levator Scapulae Muscle

2. Where does it come off of the brachial plexus?

Root of C5

3. What roots contribute to it?

C5 only

7

Long Thoracic Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Serratus Anterior Muscle

2. Where does it come off of the brachial plexus?

Root of C5

3. What roots contribute to it?

C5, C6, C7

8

What two Nerves come directly off of the Superior Trunk?

Suprascapular Nerve and Subclavian and Nerve

9

Suprascapular Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Supraspinatus Muscle and Infraspinatus Muscle

2. Where does it come off of the brachial plexus?

Superior Trunk 

3. What roots contribute to it?

C5 and C6

10

Subclavian Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Subclavius Muscle 

2. Where does it come off of the brachial plexus?

Superior Trunk

3. What roots contribute to it?

C5 and C6

11

Lateral Pectoral Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Pectoralis Major Muscle

2. Where does it come off of the brachial plexus?

Lateral Cord

3. What roots contribute to it?

C5, C6, and C7

12

Thoracodorsal Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Latissimus Dorsi Muscle

2. Where does it come off of the brachial plexus?

Posterior Cord

3. What roots contribute to it?

C6, C7, and C8

13

Superior Subscapular Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Subscapularis Muscle

2. Where does it come off of the brachial plexus?

Posterior Chord

3. What roots contribute to it?

C5 and C6

14

Inferior Subscapular Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Subscapularis Muscle and Teres Major Muscle

2. Where does it come off of the brachial plexus?

Posterior Chord

3. What roots contribute to it?

C5 and C6

15

Medial Pectoral Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Pectoralis Major and Minor Muscles

2. Where does it come off of the brachial plexus?

Medial Chord

3. What roots contribute to it?

C8 and T1

16

Medial Brachial Cutaneous Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Skin of the brachium 

2. Where does it come off of the brachial plexus?

Medial Chord

3. What roots contribute to it?

Skin of Medial Arm

17

Medial Antebrachium Cutaneous Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Skin of medial forearm

2. Where does it come off of the brachial plexus?

Medial Chord

3. What roots contribute to it?

C8 and T1

18

If there is an injury to the Anterior Rami of C5 and C6, what disease can you expect?

Erb-Duchenne Palsy (Waiter Tip Position)

-Adducted Arm

-Medially Rotated Arm

-Extended Elbow

 

19

If there is an injury to lower brachial plexus or injure the ulnar nerve, what disease can you expect?

Klumpke Paralysis (Claw Hand)

Will affect the short muscles of the hand when the individual tries to make a fist

20

What might happen if you spend an extended amount of time working with your arm above your head?

Compression of the Brachial Plexus

-Weakness and tingling in the arms

-Pain radiating down the arm

-Loss of sensation in the arm

21

Musculocutaneous Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

 

1. What does it innervate?

Biceps Brachii Muscles (long and short head)

Coracobrachialis Muscle 

Brachialis Muscle

2. Where does it come off of the brachial plexus?

Terminal Branch (anterior)

3. What roots contribute to it?

C5, C6, and C7

 

22

Musculocutaneous Nerve splits off into another nerve:

What is this nerve and what does it innervate?

Lateral Antebrachial Cutaneous Nerve

-innervates lateral skin of the forearm

23

What happens if the Musculocutaneous Nerve is injured?

Renders the anterior brachial muscles paralyzed and possible loss to sensation on the skin of the lateral forearm

 

(Quiet rare and is possible with blunt force trauma)

24

Axillary Nerve

1. What does it innervate?

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate?

Deltoid Muscle and Teres Minor Muscle

2. Where does it come off of the brachial plexus?

Terminal Branch (posterior)

3. What roots contribute to it?

C5 and C6

25

Axillary Nerve splits off into another nerve:

What is this nerve and what does it innervate?

Superior Lateral Brachial Cutaneous Nerve

The name describes the position of the Deltoid, which is where the Axillary nerve innervates both Muscle and Skin.

26

What happens if the Musculocutaneous Nerve is injured?

Atrophy of the Deltoid Musle and loss of sensation over the superolateral arm

-Inability to abduct the arm to 90 degrees (the Supraspinatus can get it up about 15 degrees) 

27

Median Nerve

1. What does it innervate? (only median nerve proper)

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

1. What does it innervate? Mostly forearm flexor muscles

-Pronator Teres

-Flexor Carpi Radialis

-Palmaris Longus

-Flexor Digitorum Superficialis

2. Where does it come off of the brachial plexus?

Terminal Branch (anterior)

3. What roots contribute to it?

C5 - T1 (all of them)

28

What are the branches off of Median Nerve and what do they innervate?

 

Hint: 4 branches

P.S. Hopefully this is worst card in deck

Anterior Interosseous Nerve:

-Lateral Part of Flexor Digitorum Profundus

-Flexor Pollicis Longus

-Pronator Quadratus  

Palmar Cutaneous Branch of the Median Nerve:

Skin of the palm 

(Can feel the Palm in Carpal Tunnel)

Recurrent Branch of Median Nerve:

-Flexor Pollicis Brevis (superificial head)

-Abductor Pollicis Brevis

-Opponens Pollicis 

Lateral Branch of Median Nerve:

1st Lumbrical 

Medial Branch of Median Nerve:

-2nd Lumbrical 

-Common Palmar Digital Nerves

-Proper Palmar Digital Nerves 

29

What can damage to the median nerve cause?

Hand of Benediction

30

Ulnar Nerve

1. What does it innervate? (only ulnar nerve proper)

2. Where does it come off of the brachial plexus?

3. What roots contribute to it?

4. What are its two main branches? 

1. What does it innervate? (only ulnar nerve proper)

Flexor Carpi Ulnaris Muscle

Flexor Digitorum Profundus (medial half)

2. Where does it come off of the brachial plexus?

Terminal branch (anterior)

3. What roots contribute to it?

C8 and T1

4. What are its two main branches?

Deep Ulnar Nerve and Superficial Ulnar Nerve