Rotator Cuff Muscles
rotator cuff muscles
-all insert into the capsule of the shoulder joint -all originate from the scapula -function is to dynamically stabilize the shoulder
Teres Minor Nerve
Axillary Nerve
Teres Minor Blood Supply
Circumflex Scapular Artery and Suprascapular Artery
Infraspinatus Origin
Infraspinous fossa
Pneumonic for the Rotator Cuff Muscles
S.I.T.S
Teres Minor Origin
bottom 2/3 of lateral border of the scapula
Supraspintus
does not rotate and it runs through the suprascapular notch
How many rotator cuff muscles are there?
four
Supraspintus Action
initiation of the abduction of humerus
Subscapularis Action
internal rotation of the humerus (this muscle is the strongest internal rotator)
Subscapularis Insertion
lesser tubercle of the humerus
Winging of the Scapula is caused by
loss of the long thoracic nerve
Subscapularis
most powerful internal rotator of the shoulder
If muscle inserts on Posterior Humerus
one gets lateral/external rotation
If muscle inserts on Anterior Humerus
one gets medial/internal rotation
Teres Minor Insertion
posterior greater tubercle, inferior to infraspinatus
Infraspinatus Insertion
posterior part of the greater tubercle (inferior)
Infraspinatus Action
shoulder external rotation and some adduction
Teres Minor Action
shoulder external rotation and some adduction
Subscapularis Artery
subscapular artery...splits into the thoracodorsal artery and Circumflex scapular arteries
Subscapularis Origin
subscapular fossa (smooth side of scapula
Supraspintus insertion
superior portion of the GREATER tubercle of the humerus
Infraspinatus Blood Supply
suprascapular artery
Supraspintus Blood Supply
suprascapular artery
Infraspinatus Nerve
suprascapular nerve
Supraspintus Nerve
suprascapular nerve
name the four rotator cuff muscles
supraspinatus, infraspinatus, teres minor, subscapularis
Supraspintus Origin
supraspinous fossa
What does subscapular artery split into?
thoracodorsal artery and circumflex scapular arteries
Subscapularis Nerve
upper and lower subscapular nerve
loss of Long Thoracic Nerve results in
winging of the scapula
