Impulse

Any communicated force. Also, the shock and reverberation on the chest-walls caused by the beating of the heart. Also, a sudden spontaneous emotion of the mind or influence acting upon it. I., Cardiac, the systolic beat of the heart occurring at the apex, and felt in the fifth intercostal space to the left of the sternum. I., Morbid, any strong, unnatural impulse, especially one of an insane character. Morbid impulses are variously qualified, as animal, destructive, homicidal, suicidal, uncontrollable, etc. Impulsion. The act of driving or urging onward, either mentally or physically.