7. Axilla + Brachial Plexus Flashcards
Which muscle forms the anterior wall of the axilla?
Pectoralis major
When does the brachial vein become the axillary vein?
At the lower border of teres major
What muscle contributes to the posterior wall of the axilla?
Trees major
When does the subclavian artery become the axillary artery?
Lateral border of the first rib
Which anterior rami form the brachial plexus?
C5-T1
What are the trunks in the brachial plexus?
Combinations of roots, which give rise to divisions
What roots form the superior trunk?
anterior rami of C5&C6
What roots from the middle trunk?
Anterior rams of C7
What roots from the interior trunk?
Anterior rami of C8&T1
What does each trunk divide into?
Anterior and posterior divisons
What do the anterior and posterior trunk divisions combine to form?
Cords
What is the medial cord a continuation of?
anterior division of the inferior trunk
Divisions of which trunks form the lateral cord?
Anterior divisions of the superior and middle trunks
Divisions of which trunks form the posterior cord?
Posterior divisions of superior, middle and inferior trunks
Where does the ulnar nerve arise from?
Medial cord
Where does the musculocutaneous nerve arise from?
Lateral cord
What does the posterior cord divide into?
Axillary nerve and radial nerve
Which cords contribute to the formation of the median nerve?
Medial and lateral cords
Where do the roots and trunks lie?
Between anterior and middle scalene muscles of the neck
Where do the divisions lie?
Immediately posterior to the subclavian vessels in the root of the neck
Where do the cords lie?
Around the axillary artery
Which muscles does the musculocutaneous nerve supply?
Coracobrachialis
Biceps brachii
Brachialis
Which compartment of the arm do the axillary and radial nerve supply?
Posterior
Which is superior, the axillary or radial nerve?
Axillary nerve
