Saccade
the major saccades that are easily observed with the naked eye and the minor saccades that are virtually unobservable without special instrumentation.
The word saccade is borrowed from the French. It is derived from the Old French sachier meaning to shake. In horse riding, a saccade is the bruque shaking given to the reins of a horse as a signal to the horse. Also called saccadic movement.
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Being like a small pouch. For example, the alveolar saccules are little air pouches within the lungs.
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An aneurysm that resembles a small sack. A berry aneurysm is typically saccular.
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Referring to the sacrum. For example, sacral agenesis is absence of all or part of the sacrum.