Left cusp

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Left cusp
Base of ventricles exposed by removal of the atria. (Valves visible on top of heart.)
Aorta laid open to show the semilunar valves. (Note that captions don't align with current terminology.)

The cusps of the heart valves serve to seal the heart valves when closed. There are normally three cusps for each valve except the mitral valve (hence its alternate name, "bicuspid valve".)

"Nodules" are located at the tip of the valve, to form a tighter seal.

Contents 1 Semilunar valves 2 Atrioventricular valves 3 References 4 External links

Semilunar valves

• pulmonary valve^[1]
  • "right cusp"
  • "left cusp"
  • "anterior cusp"

• aortic valve^[1]. (Note that one is absent in the condition bicuspid aortic valve.)
  • "right cusp"
  • "left cusp"
  • "posterior cusp" (or "noncoronary cusp")

Atrioventricular valves

• tricuspid valve
  • "anterior cusp" (or "infundibular cusp")
  • "posterior cusp" (or "marginal cusp")
  • "septal cusp" (or "medial cusp")

• mitral valve
  • "anterior cusp"
  • "posterior cusp"

References

External links

• SUNY Figs 20:07-00 - "Valves of the heart."

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v • d • e Anatomy of torso, cardiovascular system: heart
Structures	atria (interatrial septum, musculi pectinati) • ventricles (interventricular septum, trabeculae carneae, chordae tendinae, papillary muscle) • valves • cusps
Regions	base • apex • grooves (coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular) • surfaces (sternocostal, diaphragmatic) • borders (right, left)
Right heart	(vena cavae, coronary sinus) → right atrium (auricle, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of the inferior vena cava, valve of the coronary sinus) → tricuspid valve → right ventricle (conus arteriosus, moderator band/septomarginal trabecula)  → pulmonary valve → (pulmonary artery and pulmonary circulation)
Left heart	(pulmonary veins) → left atrium (auricle) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)
Layers	pericardium: fibrous pericardium • serous pericardium (pericardial cavity, epicardium/visceral layer) • pericardial sinus myocardium • endocardium • cardiac skeleton (fibrous trigone, fibrous rings)
Conduction system	Cardiac pacemaker • SA node • AV node• bundle of His • Purkinje fibers