Respiratory A&P: Respiratory Musculature

What is the job of the muscles of inspiration?

• lower or depress the ribs, decreasing thoracic volume

• elevate the ribs, which allows for increase in volume of thoracic cavity.

• compress abdominal contents, driving them upward, and thereby decreasing thoracic volume.

• elevate the ribs, decreasing volume of thoracic cavity

What muscle is shown?

• Trapezius

• Subclavius

• Diaphragm

• Intercostals

What muscle is shown?

• Subclavius

• Levator Costarum

• Intercostals

• Serratus anterior

What muscle is shown?

• Pectoralis Minor

• Scalenes

• Subclavius

• Sternocleidomastoid

What muscle is shown?

• Pectoralis minor
• Sternocleidomastoid

• Scalenes

• Pectoralis major

The action of the diaphragm is...

• elevates upper 9 ribs if scapula is fixed

• elevates rib 1 when clavicle is fixed

• flattens upon contraction (during inhalation) and moves downward, compressing abdominal contents

• stabilizes skull, shoulder, and rib cage, allowing other muscles to act upon the ribs

Contraction of the diaphragm...

• Increases volume of thorax and creates outward airflow

• Decreases volume of thorax and creates inward airflow

• Increases volume of thorax and creates inward airflow

• Decreases volume of thorax and creates outward airflow

What muscle is shown?

• Serratus Posterior Superior

• Scalenes

• Levator costarum

• Pectoralis Major

What muscle is shown?

• Intercostals

• Levator Costarum

• Diaphragm

• Serratus Posterior Superior

What muscle is shown?

• Subclavius

• Pectoralis Minor

• Pectoralis Major

• Scalenes