B1 W2 Brachial Plexus Flashcards
Quadrangular space
Posterior humeral circumflex artery
Axillary nerve
Triangular space
scapular circumflex arteries
Triangle interval
Profunda brachii artery and radial nerve
C6 dermatome
thumb side; “6th shooter”
C7 dermatome
index finger and middle finger
“show em’ the sevens!”
C8 dermatome
ring finger and little finger
C1 dermatome
There is none; it’s in the brain
C5, T1 dermatomes
Work on anterior side of the arm, not the hand
What nerve pieces through the coracobrachialis?
Musculocutaneous nerve
Innervates biceps brachii and brachiallis too, then becomes only sensory and continues on as lateral cutaneous nerve of forearm
Anterior compartment of arm
Flexors
Coracobrachialis, biceps brachii, brachialis
Posterior compartment of arm
Extensors
Triceps brachii and anconeus
Axillary lymph nodes
Humeral/lateral (drain upper limb) Central Subscapular Pectoral (drain breast) Apical
Veins of axilla
Cephalic vein Subclavian vein Basilic vein Brachial vein Axillary vein
Cephalic vein
goes from thumb, eventually ends at axilary vein; lies in deltopectoral triange with deltoid branch of the thoracoacromial artery
Axillary vein
When subclavian vein reaches 1st rib
Continues on until it branches off as basilic and brachial vein
Suprascapular artery and nerve
Criss-cross, artery is above nerve
Army above navy
Contents of axillary
a. Axillary artery and branches
b. Axillary vein and tributaries
c. Brachial plexus and branches
d. Axillary lymph nodes
Arterial supply of breast
from thoracoacromial branches, the lateral thoracic artery, internal thoracic artery and posterior intercostal arteries
Lymphatic system
Upper right quadrant (25%): drains to right lymphatic duct
Rets of body: drains to thoracic duct
Thoracic duct
- empties into bifurcation of internal jugular vein
- Comes from thorax into subclavian vein
- Drains inferior to superior
Breast lymphatics: “sentinel node”
anterior pectoral nodes
Three methods of lymphatic drainage of breast
Method 1: pectoral – central – apical – clavicular – main lymphatic route
Method 2: parasternal lymph nodes
Method 3: deep abdominal lymph nodes
Blockage of lymphatic system
Elephantitis
Peau d’ Orange
When get a tumor on breast, Cooper’s ligaments won’t stretch, will get “peau d’ orange” appearance
