4.2. The Radial Nerve Flashcards Preview

3rd Year - MSK Upper Limb Anatomy > 4.2. The Radial Nerve > Flashcards

Flashcards in 4.2. The Radial Nerve Deck (28)
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1
Q

What is the Radial Nerve?

A

A Major Peripheral Nerve in the Upper Limb

2
Q

Where does the Radial Nerve arise?

A

In the Axilla

3
Q

What is the Radial Nerve arise from?

A

It is a Continuation of the Posterior Cord of the Brachial Plexus

4
Q

What is the Segmental (or Root) Value of the Radial Nerve?

A
  1. C5
  2. C6
  3. C7
  4. C8
  5. T1
5
Q

Where is the Radial Nerve located, in relation to the Axillary Artery?

A

It sits Posteriorly to the Axillary Artery - in the Axilla

6
Q

How does the Radial Nerve exit the Axilla?

A

Inferiorly, Via the Triangular Interval

7
Q

What happens to the Radial Nerve after it leaves the Axilla?

A

It Descends down the Arm

8
Q

Where does the Radial Nerve travel in the Upper Arm?

A

In the Radial Groove of the Humeus

9
Q

What happens to the Radius as it travels down, next to the Humerus?

A

It Laterally Wraps around the Humerus

10
Q

What is the Radial Nerve accompanied by for most of its course of the Upper Arm?

A

The Deep Branch of the Brachial Artery

11
Q

How does the Radial Nerve enter the Forearm?

A

It moves Anteriorly, Over the Lateral Epicondyle of the Humerus, through the Cubital Fossa

12
Q

What happens to the Radial Nerve, as it passes through the Cubital Fossa?

A

It Terminates, dividing into 2 Nerves

13
Q

What are the 2 Nerves which the Radial Nerve divides into, in the Cubital Fossa?

A
  1. Deep Branch of the Radial Nerve

2. Superficial Branch of the Radial Nerve

14
Q

Where does the Radial Nerve innervate Muscles?

A
  1. Posterior Upper Arm

2. Posterior Compartment of the Forearm

15
Q

What does the Radial Nerve innervate in the Posterior Upper Arm?

A

The 3 Heads of the Triceps Brachii

16
Q

What is the Action of the Triceps Brachii?

A

This Extends the Arm at the Elbow

17
Q

What does the Radial Nerve supply as it leaves the Axilla?

A
  1. Long Head of the Triceps Brachii

2. Medial Head of the Triceps Brachii

18
Q

As The Radial Nerve Laterally Wraps around the Humerus, what does it supply?

A

It Supplies a Branch to the Long Head of the Triceps Brachii

19
Q

What Muscles of the Forearm, does the Radial Nerve Supplies Branches for?

A
  1. Brachioradialis Muscle

2. Extensor Carpi Radialis Longus

20
Q

What is the Deep Branch of the Radial Nerve associated with?

A

Innervation of the Muscles of the Posterior Compartment of the Forearm

21
Q

Where does the Radial Nerve provide Sensory innervation for?

A
  1. Upper Arm
  2. Forearm
  3. Hand
22
Q

How many Sensory Branches of the Radial Nerve are there?

A

4

23
Q

What are the 4 Sensory Branches of the Radial Nerve?

A
  1. Lower Lateral Cutaneous Nerve of the Arm
  2. Posterior Cutaneous Nerve of the Arm
  3. Posterior Cutaneous Nerve of the Forearm
  4. Terminal Superficial Branch of the Radial Nerve
24
Q

What does the Lower Lateral Cutaneous Nerve of the Arm provide Sensory innervation for?

A

Lateral Aspect of the Upper Arm

25
Q

What does the Posterior Cutaneous Nerve of the Arm provide Sensory innervation for?

A

Posterior Surface of the Upper Arm

26
Q

What does the Posterior Cutaneous Nerve of the Forearm provide Sensory innervation for?

A

Strip of Skin down the Middle of the Posterior Forearm

27
Q

What is the Significance of the Superficial Branch of the Radial Nerve?

A

It is the Terminal Division of the Radial Nerve

28
Q

What does the Superficial Branch of the Radial Nerve provide Sensory innervation for?

A

Dorsal Surface of the Lateral 3 1/2 Digits, and their associated Palm Area

Decks in 3rd Year - MSK Upper Limb Anatomy Class (48):