Axilla and Brachial Plexus Flashcards
What muscles make up the anterior wall of the axilla?
Pectoralis major and minor mm.
What muscles make up the posterior wall of the axilla?
Latissimus dorsi, teres major, and subscapularis mm.
What makes up the medial wall of the axilla?
Serratus anterior m.
What makes up the lateral wall of the axilla?
Intertubercular sulcus of humerus
What makes up the base of the axilla?
Skin and fascia of armpit
Generally what and where is the axilla?
Pyramidal shaped region between the arm and chest
What are the contents of the axilla?
Fat and connective tissue; Axillary veins and lymphatics (outside sheath); cutaneous nerves; and axillary sheath-axillary artery and brachial plexus
What are the five principal groups of lymph nodes in the axilla?
Pectoral, subscapular, humeral, central, and apical
Pectoral lymph nodes drain what?
Anterior thoracic wall and most of breast
Subscapular lymph nodes drain what?
Posterior thoracic wall and scapular region
Humeral lymph nodes drain what?
Upper left except for the portion along the cephalic vein
Central lymph nodes of the axilla drain what?
Pectoral, humeral, and central lymph nodes
Apical lymph nodes of the axilla drain what?
All other lymph nodes of the axilla and proximal cephalic vein nodes
Part one of the axillary artery is located where?
Between the first rib and pectoralis minor muscle
Part two of the axillary artery is located where?
Deep to pectoralis minor muscle
Part three of the axillary artery is located where?
Between pectoralis minor muscle and teres major muscle
What artery comes off the first branch of the axillary artery?
Superior thoracic artery
What arteries come off the second branch of the axillary artery?
Thoracoacromial and lateral thoracic aa.
What arteries come off the third branch of the axillary artery?
Subscapular anterior, subscapular posterior, and circumflex humeral
The brachial plexus is composed of what ventral rami?
C5-T1
The brachial plexus provides nerves for what?
All upper limb muscles except trapezius muscle (CN XI)
What is the structure of the brachial plexus?
Rami(5), Trunks(3), Divisions(6), Cords(3), Branches(5)
The musculocutaneous nerve contains what spinal nerves?
C5-C7