Papillary muscle
Papillary Muscle
The Papillary Muscle (Pronunciation: Pap-ill-ary Muscle) is a muscle located in the ventricles of the heart. These muscles are responsible for controlling the function of the mitral valve and tricuspid valve, which regulate the flow of blood between the atria and ventricles.
Etymology
The term "Papillary" is derived from the Latin word "papilla" which means "nipple". This is due to the nipple-like projections that these muscles form in the heart. The term "Muscle" is derived from the Latin word "musculus" which means "little mouse", referring to the appearance and movement of certain muscles.
Function
The primary function of the Papillary Muscles is to prevent the atrioventricular valves from inverting. During the contraction of the ventricles, the papillary muscles also contract. This action pulls the chordae tendineae, preventing the inversion of the valves.
Related Terms
- Mitral Valve: One of the four valves in the heart, located between the left atrium and the left ventricle. It prevents the backflow of blood into the left atrium when the left ventricle contracts.
- Tricuspid Valve: This valve is located between the right atrium and the right ventricle. It prevents the backflow of blood into the right atrium when the right ventricle contracts.
- Atrioventricular Valves: These are the valves located between the atria and the ventricles in the heart. They include the mitral valve and the tricuspid valve.
- Chordae Tendineae: These are the tendons that connect the papillary muscles to the tricuspid valve and the mitral valve.
External links
- Medical encyclopedia article on Papillary muscle
- Wikipedia's article - Papillary muscle
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