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Summary Information: Valve Cusps Valve Cusps: Valve cusps are located in the valves of the heart and are flaps of tissue that open in one direction as blood is pumped through them. The valve cusps are made of thin fibrous tissue, covered with a smooth membrane (endocardium) and reinforced by connective tissue.
The heart is cone-shaped, with a broad base at the top from which the large blood vessels enter and exit. The tip, known as the apex, points downwards and lies close to the sternum. In the horse, the apex is blunted during diastole. The longitudinal axis of the heart is tilted , resulting in the base facing craniodorsally and the apex caudoventrally. The heart has a right and left lateral surface, which meet cranially at the right ventricular border and caudally at the left ventricular border.