Axilla and Brachial Plexus Flashcards
Which muscle forms the anterior wall of the axilla?
Pectoralis major
Where does the brachial vein becomes the axillary vein?
Lower border of teres major
Which muscle forms the posterior border of the axilla?
Teres major
Where does the subclavian artery become axillary artery?
Lateral border of first rib
The brachial plexus is formed from an interwining of what nerves?
Anterior rami of C5-T1
From proximal to distal, what does the brachial plexus contain? (Really Tired Drink Coffee Now)
Roots Trunks Divisions Cords Nerves
What are the roots of the brachial plexus?
Each of the anterior rami
What are the specific trunks of the brachial plexus?
Superior - combined anterior rami of C5 & C6
Middle - anterior rami of C7
Inferior - combined anterior rami of C8 & T1
Each trunk divides to give what?
Anterior and posterior divisions
What are cords formed from?
Combined anterior and posterior divisions
How are cords named?
According to the relationship with axillary artery
What are the named cords?
Medial
Lateral
Posterior
What is the medial cord formed from?
Anterior division of inferior trunk
What is the lateral cord formed from?
Anterior divisions of superior and middle trunks
What is the posterior cord formed from?
Posterior division of all three trunks
The cords combine to give what?
Named nerves
What are the named nerves of the brachial plexus?
Ulnar Musculocutaneous Axillary Radial Median
What is the ulnar nerve formed from?
Medial cord
What is the musculocutaneous nerve formed from?
Lateral cord
What forms the axillary and radial nerves?
Posterior cord
What forms the median nerve?
Medial and lateral cords
Where are the roots and trunks found?
Between anterior and middle scalene muscles
Where are the divisions found?
Posterior to subclavian muscles
Where are the cords found?
Distal to first rib around axillary artery
What does the musculocutaneous nerve supply?
Coracobrachialis
Biceps brachii
Brachialis
What does the axillary nerve wrap around?
Posterior aspect of surgical neck of humerus
What does the radial nerve wrap around?
Posterior aspect of mid-shaft of humerus
