UE Angiology Flashcards
Where does the subclavian A originate?
On the right side from the brachiocephalic trunk
On the left side it branches directly off the aortic arch
What are the three regions of the subclavian A?
- Proximal to the anterior scalene M
- Deep to anterior scalene
- Distal to the anterior scalene M and proximal to 1st rib
Which branches are in the first region of the subclavian A?
Vertebral and internal thoracic
Thyrocervical trunk*
What are the branches of the thyrocervical trunk?
Inferior thyroid, suprascapular, transverse cervical artery (branches into superficial and deep branches)
What does the suprascapular A supply?
Travels through the suprascapular notch over the transverse scapular L to the posterior aspect of the scapula to supply the supraspinatus and infraspinatus M
What are the branches of region two of the subclavian A?
Costocervical trunk giving a supreme intercostal and deep cervical A
What branches are in the third region of the subclavian A?
Dorsal scapular A
What is the axillary A a continuation of?
The subclavian A distal to the first rib
Divided into three regions by the pectoralis minor
What are the three regions of the axillary A?
- Distal to the 1st rib and proximal to pec minor
- Deep to pec minor
- Distal to pec minor and proximal to teres major
What branches are in the first region of the axillary A?
Superior thoracic A
Supplies the superior most serratus anterior M
Which branches are in the second region of the axillary A?
Thoracoacromial trunk and lateral thoracic A
What does the thoracoacromial trunk of the axillary A supply?
Pectoralis major and minor + deltoid
What does the lateral thoracic A of the axillary A supply?
Pectoralis major and minor, serratus anterior and intercostal muscles
Which arteries are in region 3 of the axillary A?
Subscapular A + anterior and posterior circumflex humeral,
What are the two terminal branches of the subscapular A of the axillary A?
Circumflex scapular A and thoracodorsal A
Which region of the axillary A is susceptible to anuerysm?
Region one especially in individuals experiencing repeated rapid arm movements (like baseball pitchers) and can compress the brachial plexus resulting in pain and loss of sensation
What supplies the deltoid muscle?
Posterior circumflex humeral A from region 3 of the axillary A
Due to the extensive anastomoses around the scapula, where must ligation occur to cut off all blood supply to the arm?
Distal to the subscapular A of the axillary A
Ligation of the axillary A between the thyrocervical trunk and subscapular A results in what?
A reversal of blood flow in the subscapular A due to collateral circulation arriving via suprascapular, transverse cervical and intercostal A to the scapular region and continued feed of arterial blood to the brachial A
The anterior circumflex humeral is always what compared to the posterior circumflex humeral A?
Smaller
What is the brachial A a continuation of?
The axillary A distal to the teres major muscle beginning medial to the humerus
What are the branches of the brachial A?
Deep brachial, muscular branches, humeral nutrient A, superior and inferior ulnar collateral, ulnar A and radial A