Anterior Thoracic Muscles

Question 1

What is the main action, origin, insertion and innervation of the pectoralis major?

Answer 1

O: medial clavicle (clavicular head) and sternum and costal cartilage of the first 6 ribs (sternocostal head)
I: bicipital groove
MA: glenohumeral adduction, glenohumeral medial rotation
MA: glenohumeral flexion and glenohumeral cross-flexion (clavicular head)
MA: glenohumeral extension (sternocostal head)
IN:

Question 2

What is the main action, origin, insertion and innervation of the pectoralis minor?

Answer 2

O: ribs 3-5
I: coracoid process
MA: scapular depression and scapular protraction
IN:

Question 3

What is the main action, origin, insertion and innervation of the subclavius?

Answer 3

O: rib 1
I: middle inferior surface of the clavicle
MA: anchors and depresses clavicle
IN:

Question 4

What is the main action, origin, insertion and innervation of the serratus anterior?

Answer 4

O: upper 8 ribs
I: medial border of the scapula
MA: scapular protraction and scapular upward rotation
IN: