085 Origin, Insertion, and Action of Serratus Anterior

Leslie Samuel introduces the serratus anterior muscle, explaining its name origin, origin and insertion points, and its actions. The muscle originates from the external surfaces of ribs 1-8 or 9 and inserts on the anterior surface of the medial border of the scapula. Its actions include stabilizing the scapula, protracting it, and assisting in upward rotation. The video concludes with a review and directs viewers to additional resources on Interactive-Biology.com.

What is the visual characteristic of the serratus anterior muscle that gives it its name?

• It resembles a smooth surface.

• It has a tooth-like or saw-like appearance.

• It looks like a flat sheet.

• It is circular in shape.

Where does the serratus anterior muscle originate?

• The anterior surface of the scapula.

• The external surfaces of ribs one through eight or nine.

• The posterior surface of the humerus.

• The clavicle.

What is the insertion point of the serratus anterior muscle?

• The anterior surface of the medial border of the scapula.

• The posterior surface of the ribs.

• The superior angle of the scapula.

• The lateral border of the scapula.

Which action is NOT performed by the serratus anterior muscle?

• Protracting the scapula.

• Stabilizing the scapula.

• Flexing the elbow.

• Upward rotation of the scapula.

How does the serratus anterior muscle contribute to the movement of the scapula?

• It depresses the scapula.

• It retracts the scapula.

• It stabilizes and protracts the scapula.

• It causes downward rotation.