Force Couples *Muscles prone to weakness. **Muscles prone to tightness.

Question 1

Protraction (scapula)

Answer 1

Agonist/Stabilizer-Serratus anterior* Pectoralis major* * and minor**
Antagonist/Stabilizer- Trapezius Rhomboids

Question 2

Retraction (scapula)

Answer 2

Agonist/Stabilizer-Trapezius Rhomboids

Antagonist/Stabilizer-Serratus anterior* Pectoralis major* * and minor* *

Question 3

Elevation (scapula)

Answer 3

Agonist/Stabilizer-Upper trapezius** Levator scapulae**

Antagonist/Stabilizer-Serratus anterior* Lower trapezius*

Question 4

Depression (scapula)

Answer 4

Agonist/Stabilizer-Serratus anterior* Lower trapezius*

Antagonist/Stabilizer-Upper trapezius** Levator scapulae**

Question 5

Lateral rotation (upward rotation of
inferior angle of scapula)

Answer 5

Agonist/Stabilizer-Trapezius (upper** and lower* fibers)
Serratus anterior*
Antagonist/Stabilizer-Levator scapulae** Rhomboids Pectoralis minor**

Question 6

Medial rotation (downward rotation
of inferior angle of scapula)

Answer 6

Agonist/Stabilizer-Levator scapulae** Rhomboids
Pectoralis minor**
Antagonist/Stabilizer-Trapezius (upper** and lower* fibers)
Serratus anterior*

Question 7

Scapular stabilization

Answer 7

Agonist/Stabilizer-Upper trapezius** Lower trapezius*
Rhomboids
Antagonist/Stabilizer-Serratus anterior*

Question 8

Abduction (humerus)

Answer 8

Agonist/Stabilizer-Deltoid

Antagonist/Stabilizer-Supraspinatus

Question 9

Medial rotation (humerus)

Answer 9

Agonist/Stabilizer-Subscapularis** Pectoralis major* *
Latissimus dorsi Anterior deltoid
Antagonist/Stabilizer-Infraspinatus* Teres minor
Posterior deltoid

Question 10

Lateral rotation (humerus)

Answer 10

Agonist/Stabilizer-Infraspinatus Teres minor
Posterior deltoid
Antagonist/Stabilizer-Subscapularis** Pectoralis major* *
Latissimus dorsi Anterior deltoid