Muscles Of The Anterior Trunk

Question 1

Pectoralis Major

Answer 1

Superficial

Whole muscle adducts and medially rotates arm

Question 2

Subscapularis

Answer 2

Deep muscle

Medially rotates arm

Question 3

Serratus Anterior

Answer 3

Abducts scapula and rotates it upwards. Occurs when throwing a punch.

Question 4

Pectoralis Minor

Answer 4

Abducts scapula and rotates it downwards

Question 5

Rectus Abdominis

Answer 5

Superficial

Flexes vertebral column and compresses abdomen

Question 6

External Oblique

Answer 6

Superficial

Bilateral contraction flexes vertebral column and compresses abdomen.
Unilateral contraction laterally flexes and rotates vertebral column to the OPPOSITE side.

Question 7

Internal oblique

Answer 7

Deep

Unilateral contraction laterally flexes and rotates vertebral column to the SAME side

Question 8

Transversus abdominis

Answer 8

Deep

Compresses abdomen and stabilizes trunk

Question 9

External intercostals

Answer 9

Deep

Increase thoracic diameter by elevating ribs during inspiration

Question 10

Internal intercostals

Answer 10

Deep

Decrease thoracic diameter by depressing ribs during forced expiration

Question 11

Deltoid

Answer 11

Superficial
Anterior fibers: flex and medially rotate arm

Lateral fibers: abduct arm

Posterior fibers: extend and laterally rotate arm

Question 12

Diaphragm

Answer 12

Deep

Flattens, increasing length of thoracic cage, during normal inspiration