083 The Origin, Insertion, and Action of Pectoralis Minor

Leslie Samuel discusses the pectoralis minor muscle, covering its origin, insertion, and action. The muscle originates from the anterior surface of ribs 3-5 and inserts on the medial aspect of the coracoid process of the scapula. Its primary function is to stabilize the scapula by pulling it inferiorly and anteriorly. The video concludes with a review of these key points.

What is the origin of the pectoralis minor muscle?

• Lateral surface of ribs 6-7 and 8

• Posterior surface of ribs 1-2 and 3

• Anterior surface of ribs 3-4 and 5

• Medial surface of ribs 9-10 and 11

Where does the pectoralis minor insert?

• Inferior aspect of the acromion

• Superior aspect of the clavicle

• Medial aspect of the coracoid process

• Lateral aspect of the coracoid process

What is one of the primary roles of the pectoralis minor?

• Stabilizing the scapula

• Stabilizing the sternum

• Stabilizing the clavicle

• Stabilizing the humerus

How does the pectoralis minor affect the scapula when it contracts?

• Pulls it superiorly and posteriorly

• Pulls it inferiorly and anteriorly

• Pulls it laterally and medially

• Pulls it upward and backward

What is the overall action of the pectoralis minor on the thoracic wall?

• Pushes the scapula away from the thoracic wall

• Pulls the scapula against the thoracic wall

• Pulls the thoracic wall inward

• Pushes the thoracic wall outward