Shoulder, Arm, Brachial Plexus Flashcards
Supraspinatus Origin
supraspinous fossa of scapula
Supraspinatus Insertion
greater tubercle of humerus
Supraspinatus Action
abduction of humerus, first 0-10o
Supraspinatus Innervation
suprascapular n.
Supraspinatus Blood supply
suprascapular a.
Infraspinatus Origin
infraspinous fossa of scapula
Infraspinatus Insertion
greater tubercle of humerus (just posterior to supraspinatus)
Infraspinatus Action
lateral rotation of humerus
Infraspinatus Innervation
suprascapular n.
Infraspinatus Blood supply
suprascapular a and circumflex scapular a.
Teres Minor Origin
upper 2/3 of lateral (axillary) border of scapula
Teres Minor Insertion
greater tubercle of humerus (posterior and inferior to infraspinatus)
Teres Minor Action
lateral rotation of humerus
Teres Minor Innervation
axillary n.
Teres Minor Blood supply
subscapular a and circumflex scapular a.
Subscapularis Origin
subscapular fossa of scapula
Subscapularis Insertion
lesser tubercle of humerus
Subscapularis Action
medial rotation of humerus
Subscapularis Innervation
upper and lower subscapular n.
Subscapularis Blood supply
subscapular a.
Teres Major Origin
inferior angle of scapula
Teres Major Insertion
lesser tubercle of humerus
Teres Major Action
extension of humerus, adduction of humerus
Teres Major Innervation
lower subscapular n
Teres Major Blood supply
subscapular a., circumflex scapular a.
Triceps brachii Origin
infraglenoid tubercle of scapula (long head); posterolateral surface of humerus above radial groove (lateral head);
posteromedial surface of humerus below radial groove (medial head)
Triceps brachii Insertion
olecranon process of ulna
Triceps brachii Action
extension of forearm (all heads) extension of humerus (long head) adduction of humerus (long head)
Triceps brachii Innervation
Radial n.
Triceps brachii Blood supply
deep brachial and posterior circumflex humeral a.
