Pectinate muscles

Pectinate Muscles are unique anatomical structures found within the heart, specifically in the atria. They are named for their comb-like appearance, with the term "pectinate" deriving from the Latin word for "comb". These muscles play a crucial role in the functioning of the heart, contributing to the contraction of the atria and the subsequent pumping of blood.

Anatomy

The Pectinate Muscles are located in the atria of the heart, with a more extensive presence in the right atrium than the left. They originate from the Crista Terminalis, a smooth muscular ridge that serves as the dividing line between the sinus venarum and the atrium proper. The muscles extend to the anterior part of the atrial wall and the inner surface of the atrial appendage.

Function

The primary function of the Pectinate Muscles is to aid in the contraction of the atria, which in turn helps to pump blood out of the atria and into the ventricles. This is a crucial part of the cardiac cycle, ensuring the efficient circulation of blood throughout the body.

Clinical Significance

Abnormalities or damage to the Pectinate Muscles can lead to a variety of cardiac conditions. For instance, Atrial Fibrillation can occur if the muscles fail to contract properly, leading to irregular heart rhythms. Additionally, the muscles can be affected by various forms of heart disease, including Congestive Heart Failure and Ischemic Heart Disease.

See Also

• Heart
• Atria
• Ventricles
• Cardiac Cycle
• Atrial Fibrillation
• Congestive Heart Failure
• Ischemic Heart Disease

References

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  Internal structure of the heart

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  Pectinate muscles of left atrium