Muscles of the Scapula and Humerus

Flashcards about muscles, origin, insertion, action.

Which muscle originates from the supraspinatus fossa of the scapula and inserts on the greater tubercle of the humerus?

Supraspinatus

Which muscle originates from the infraspinatus fossa of the scapula and inserts on the greater tubercle of the humerus (posterior to the supraspinatus)?

Infraspinatus

Which muscle originates from the subscapular fossa of the scapula and inserts on the lesser tubercle of the humerus?

Subscapularis

Which muscle originates from the axillary border of the scapula and inserts on the greater tubercle of the humerus (posterior to the infraspinatus)?

Teres Minor

Which muscle originates from the dorsal surface of the inferior angle of the scapula and inserts on the lesser tubercle of the humerus?

Teres Major

What is the action of the supraspinatus muscle?

Abducts the arm; slight lateral rotation

What is the action of the infraspinatus muscle?

Laterally rotates the arm; slight adduction

What is the action of the subscapularis muscle?

Medially rotates the arm

What is the action of the teres minor muscle?

Laterally rotates the arm

What is the action of the teres major muscle?

Adducts, extends, and medially rotates the arm