Secondary Actions

Question 1

What is the secondary action of the deltoid?

Answer 1

• Anterior Fibers: Medially Rotate the shoulder (G/H joint)
• Posterior Fibers: Laterally rotate the shoulder (G/H joint)

Question 2

What are the secondary actions of the Trapezius?

Answer 2

• Upper Fibers [unilaterally]: Rotate the head and neck (cervical spine) to the opposite side
• Middle Fibers: Stabilize the scapula (S/T joint)
• Lower Fibers: Upwardly Rotate the scapula (S/T joint)

Question 3

What is the secondary action of the Latissimus Dorsi?

Answer 3

Adduct the shoulder (G/H joint)

Question 4

What is the secondary action of Teres Major?

Answer 4

Adduct the shoulder (G/H joint)

Question 5

What is the secondary action of the Supraspinatus?

Answer 5

Stabilize the head of the humerus in glenoid cavity

Question 6

What is the secondary action of the Infraspinatus?

Answer 6

Adduct the shoulder (G/H joint)

Question 7

What is the secondary action of Teres MInor?

Answer 7

Adduct the shoulder (G/H joint)

Question 8

What is the secondary action of Subscapularis?

Answer 8

Stabilize the head of humerus in glenoid cavity

Question 9

What is the secondary action of Rhomboid Major?

Answer 9

Elevate the scapula (S/T joint)

Question 10

What is the secondary action of Rhomboid Minor?

Answer 10

Elevate the scapula (S/T joint)

Question 11

What are the secondary actions of the Levator Scapulae?

Answer 11

(Unilaterally) Laterally Flex the head and neck

(Bilaterally) Extend the head and neck

Question 12

What are the secondary actions of Serratus Anterior?

Answer 12

​(With the origin fixed) Upwardly Rotate the scapula (S/T joint)

​(With the origin fixed) Depress the scapula (S/T joint)

Question 13

What are the secondary actions of Pectoralis Major?

Answer 13

• Lower Fibers:* Extend the shoulder (G/H joint)
• Upper Fibers:* Adduct (retract) the shoulder (G/H joint)

Medially rotate the shoulder (G/H joint)

Question 14

What is the secondary action of Pectoralis Minor?

Answer 14

Downwardly rotate the scapula (S/T joint)

Question 15

What is the secondary action of the Subclavius?

Answer 15

Elevate the 1st rib (to assist during inhalation)

Question 16

What is the secondary action of the Biceps Brachii?

Answer 16

(Primary muscle of) Supination of the forearm (R/U joint)

Question 17

What is the secondary action of the Triceps Brachii?

Answer 17

Long head: Extend the shoulder (G/H joint)

Question 18

What is the secondary action of the coracobrachialis?

Answer 18

Adduct the shoulder (G/H joint)