Anatomy Dissection 7 Flashcards
What is the medial wall of the axilla?
Superolateral aspect of chest
What muscle forms the anterior wall of axilla?
Pectoralis major
Other than pectoralis major - what is the other main muscle for climbing?
Latissimus dorsi
What is the axillary vein a continuation of?
Brachial vein
At what point does the brachial vein become the axillary?
At lower border of teres major muscle
What muscle contributes to the posterior wall of axilla?
Teres major
Where can pulsations of the subclavian artery be palpated?
Where artery crosses first rib
At what point does the subclavian artery become the axillary artery?
At lateral border of first rib
What is the brachial plexus formed from?
Anterior rami of spinal nerves C5-T1
From proximal to distal, what does the brachial plexus consist of?
- Roots
- Trunks
- Divisions
- Cords
- Named nerves
The anterior rami of C5-T1 nerves mix their fibres to form what?
Trunks
What do trunks give rise to?
Divisions
What makes up the superior trunk?
Combined anterior rami of C5 and C6 spinal nerves
What makes up the middle trunk?
Anterior ramus of C7 spinal nerve
What makes up the inferior trunk?
Combined anterior rami of C8 & T1 spinal nerves
Each trunk divides to give anterior and posterior divisions, which combine to give what?
Cords
Describe the medial cord?
Direct continuation of anterior division of inferior trunk
Describe the lateral cord?
Formed from anterior division of superior and middle trunks
Describe the posterior cord?
Formed from posterior divisions of all three trunks
What does the ulnar nerve continue directly from?
Medial cord
What named nerve continues directly from lateral cord?
Musculocutaneous nerve
What does the posterior cord divide into?
Axillary nerve and radial nerve
What do the medial and lateral cords both contribute to form?
The median nerve
Where do the roots and trunks of brachial plexus mainly lie?
Between anterior and middle scalene muscles in root of neck
What part of plexus lies immediatly posterior to subclavian vessels in root of neck (deep to clavicle)?
Divisions
What part of plexus lies around the axillary artery, which is distal to first rib?
Cords
What named nerve supplies coracobrachialis muscle, biceps brachii and brachialis muscles?
Musculocutaneous
What nerve lies superior to radial nerve and wraps around the posterior aspect of surgical neck of humerus?
Axillary
What nerve wraps around the posteruor aspect of the mid-shaft of the humerus, where it may be injured by a mid-shaft humeral fracture?
Radial nerve
What is the most medial named nerve?
Ulnar
What nerve forms the middle of the M shaped configuration of the named nerves in axilla?
Median nerve
