Pectoral region - Muscle actions

Question 1

Pectoralis major
(action)

Answer 1

adducts and flexes the arm, rotates it medially.

Question 2

Serratus Anterior
(action)

Answer 2

Protracts scapular, upward rotation of scapula (glenoid cavity moves superiorly), holds scapula close to the thoracic wall, elevates ribs when scapula is fixed.

Question 3

Pectoralis minor
(action)

Answer 3

Elevates ribs, draws the scapula down and medially

Question 4

Subclavius
(action)

Answer 4

Depresses the clavicle down and forward