Muscles Connecting the Scapula to the Humerus (Action)

Question 1

Action of Deltoid

Answer 1

• Middle fibers abducts arm.
• Anterior fibers flex & medially rotate arm.
• Posterior fibers extend & laterally rotate arm.
• Abduction from 15-90 degrees.

Question 2

Action of Supraspinatus

Answer 2

✓ Abducts arm and stabilizes shoulder joint

✓ Initiation of abduction 0-15 degree

Question 3

Action of Infraspinatus

Answer 3

✓ Laterally rotates arm and stabilizes shoulder joint

Question 4

Action of Teres Major

Answer 4

✓ Medially rotates and adducts arm and stabilizes shoulder joint

Question 5

Action of Teres Minor

Answer 5

✓ Laterally rotates arm and stabilizes shoulder joint

Question 6

Action of Subscapularis

Answer 6

✓ Medially rotates arm and stabilizes shoulder joint

Question 7

Abducts arm and stabilizes shoulder joint

Answer 7

Supraspinatus

Question 8

Abduction from 15-90 degrees

Answer 8

Deltoid

Question 9

Abduction from 15-90 degrees

Answer 9

Deltoid

Question 10

Medially rotates arm and stabilizes shoulder joint

Answer 10

Subscapularis

Question 11

Laterally rotates arm and stabilizes shoulder joint

Answer 11

Teres Minor

Question 12

Initiation of abduction 0-15 degrees

Answer 12

Supraspinatus

Question 13

Abducts arm

Answer 13

Middle fibers of Deltoid

Question 14

Laterally rotates arm and stabilizes shoulder joint

Answer 14

Infraspinatus

Question 15

Flex and medially rotate arm

Answer 15

Anterior fibers of Deltoid

Question 16

Medially rotates and adducts arm and stabilizes shoulder joint

Answer 16

Teres Major

Question 17

Extend and laterally rotate arm

Answer 17

Posterior fibers of Deltoid