Functional Anatomy of Major Muscles - Chest/Shoulder/Rotator Cuff musculature

Question 1

pectoralis major m

Answer 1

Isolated function: concentric-Shoulder flexion (clavicular fibers), horizontal adduction, and internal rotation
integrated function: eccentric-shoulder extension horizontal abduction, and external rotation
isometric-stabilizes the shoulder girdle

Question 2

Pectoralis minor

Answer 2

Isolated function: Concentric-protract scapula
integrated function: eccentric-scapula retraction
isometric-stabilizes the shoulder.irdle

Question 3

Anterior deltoidDeltoid move in front of deltoid

Answer 3

Isolated function: concentric-shoulder flexion and internal rotation
integrated function: eccentric-shoulder extension and external rotation
isometric-stabilizes the shouldergirdle.

Question 4

Medial deltoid

Answer 4

Isolated function: concentric-shoulder abduction
integrated function: eccentric-shoulder adduction
isometric-stabilizes the shoulder

Question 5

Posterior deltoid

Answer 5

Concentric-shoulder extension and external rotation
integrated function: eccentric-shoulder flexion and internal rotation
isometric-stabilizes the shoulder girdle.

Question 6

Teres minor

Answer 6

Isolated function: concentric-shoulder external rotation
integrated function: eccentric-shoulder internal rotation
isometric-stabilizes the shoulder girdle

Question 7

Subscapularis

Answer 7

Isolated function: concentric-shoulder internal rotation integrated function: eccentric-shoulder external rotation
isometric-stabilizes the shoulder

Question 8

Infraspinatus

Answer 8

Isolated function: concentric-shoulder external rotation
integrated function: eccentric-shoulder internal rotation
isometric-stabilizes the shoulder girdle

Question 9

Supraspinatus

Answer 9

Isolated function: concentric-abduction of the arm
integrated function: eccentric- adduction of the arm
isometric-stabilizes the shoulder girdle

Question 10

teres major

Answer 10

Isolated function: concentric-shoulder internal rotation, adduction and extension
integrated function: eccentric-shoulder external rotation, abduction, and flexion
isometric-stabilizes the shoulder girdle