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Related to Rivinus' notch: Shrapnell's membrane
an indentation, especially one on the edge of a bone or other organ; called also incisure.
aortic notch (dicrotic notch) a small downward deflection in the arterial pulse or pressure contour immediately following the closure of the semilunar valves, sometimes used as a marker for the end of systole or the ejection period.
parotid notch the notch between the ramus of the mandible and the mastoid process of the temporal bones.
Rivinus' notch, tympanic notch
Etymology: Augustus Q. Rivinus, German anatomist, 1652-1723
a deficiency in the tympanic sulcus of the ear that forms an attachment for the flaccid part of the tympanic membrane and the mallear folds. Also called Rivinus' incisure , tympanic incisure.