What is the name given to the major network of nerves which innervate the upper limb?
The Brachial Plexus
Where can the Brachial Plexus be found?
- It begins at the Cervical Region
2, It extends to the Axilla
- What Rami forms the Brachial Plexus?
2. What Spinal Levels do these Rami come from?
- Ventral Rami
2. C5, C6, C7, C8, and T1
What nerve roots form the Upper Trunk?
- C5
2. C6
What is Erb’s Point?
The point where C5 and C6 converge to form the Upper Trunk
- What does injury to the Upper Trunk cause?
- How will this present?
- What can cause this?
- Erb’s Palsy - Paralysis of the Biceps Brachii, Brachialis, Corticobrachialis, and Brachioradialis
- “Waiters Tip” appearance (medially rotated with wrist flexed)
- a) Shoulder Dystocia at birth
- b) A Fall onto the shoulder
What Acronym can be used to remember the order of Brachial Plexus stages?
Read - Roots That - Trunks Damn - Divisions Card - Cords Back - (Terminal) Branches
What nerve roots form the Lower Trunk?
- C8
2. T1
- What does injury to the Lower Trunk cause?
2. What can cause this?
- Klumpke’s Palsy - Paralysis of the Intrinsic Muscles of the Hand, and Ulnar Flexors of the Wrist and Fingers
- Undue abduction of the arm
- What do the division of the 3 trunks form?
- How many divisions do the trunks divide into?
- Where can this be found?
- Cords (Read That Damn Card Back
- 2, Each trunk has an Anterior and a Posterior Division
- In the Axilla
What are the names of the Cords formed in the Axilla?
- Lateral Cord
- Posterior Cord
- Medial Cord
How are the Cords of the Brachial Plexus named?
After their position in relation to the Axillary Artery in the Axilla
What root(s) form the:
a) Upper Trunk
b) Middle Trunk
c) Lower Trunk
The ventral rami of:
a) C5 and C6
b) C7
c) C8 and T1
What are the branches of the Lateral Cord of the Brachial Plexus?
- Lateral Pectoral
- Lateral Root of the Median Nerve
- Musculocutaneous Nerve
What are the branches of the Medial Cord of the Brachial Plexus?
- Medial Pectoral
- Ulnar Nerve
- Medial Root of the Median Nerve
- Medial Cutaneous Nerve of the Arm
- Medial Cutaneous Nerve of the Forearm
What are the branches of the Posterior Cord of the Brachial Plexus?
- Thoracodorsal Nerve
- Axillary Nerve
- Radial Nerve
- Upper and Lower Subscapular Nerve
What nerve is formed from the roots of C5, C6, and C7?
The Long Thoracic Nerve