Intercostal muscles are a group of muscles located between the ribs that play a crucial role in the mechanics of breathing by aiding in the expansion and contraction of the thoracic cavity. They are divided into external, internal, and innermost intercostal muscles, each with specific functions in respiration and stabilization of the ribcage.

Intercostal Muscles

Intercostal muscles

group of muscles

between the ribs

mechanics of breathing

aiding in the expansion

contraction of the thoracic cavity

External intercostal muscles are a group of muscles located between the ribs that play a crucial role in the mechanics of breathing by aiding in the expansion of the chest cavity during inhalation. These muscles contract to elevate the ribs, increasing the volume of the thoracic cavity and thereby reducing the pressure inside, which draws air into the lungs.

External Intercostal Muscles

The internal intercostal muscles are a group of skeletal muscles located between the ribs, playing a crucial role in the mechanics of breathing by aiding in forced expiration. They work by pulling the ribs downward and inward, reducing the volume of the thoracic cavity and helping to expel air from the lungs.

Internal Intercostal Muscles

The innermost intercostal muscles are the deepest layer of intercostal muscles, located inside the thoracic cage, and they play a crucial role in facilitating respiration by stabilizing the ribs during breathing. They are separated from the internal intercostals by the neurovascular bundle, which contains the intercostal nerves and vessels.

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