- aortic valve - Three-leaflet valve located at the junction between the left ventricle and aortic entrance.
Bulbar ridges: Endocardial cushion tissue located in the bulbus cordis extending into the truncus arteriosus thus forming ridges. These fuse together to form the aorticopulmonary septum.
Chordae tendineae: Cord-like tendons connecting the papillary muscles to the leaflets of the mitral and tricuspid valves.
Mitral valve: (Bicuspid valve) two leaflet valve located on the left side of the heart i.e. between the left atrium and ventricle.
Papillary muscles: Small muscles found on the inner myocardium of the left and right ventricles. They are attached to the mitral and tricuspid valves via the chordae tendineae and serve to limit the movements of the valves.
Pulmonary valve: Three-leaflet valve located at the junction between the right ventricle and the pulmonary trunk.
Semilunar valves: Flaps of endocardium and connective tissue reinforced by fibres which prevent the valves from turning inside out. They are shaped like a half moon, hence the name semilunar. The semilunar valves are located between the aorta and the left ventricle and between the pulmonary artery and the right ventricle.
Trabeculae (trabeculations): Muscular beams located within the ventricles and parts of the atria of the heart.
Tricuspid valve: Three leaflet valve located in the right atrioventricular canal i.e. between the right atrium and ventricle.
- fibrous trigone - (trigonum fibrosum) term describing the dense connective tissue between the aortic ring and the atrioventricular ring and has a left and right component. The right fibrous trigone (trigonum fibrosum dextrum) lies between the aortic ring and the right atrioventricular ring. The left fibrous trigone (trigonum fibrosum sinistrum) lies between the aortic ring and the left atrioventricular ring.