Rivinus' notch


notch

 [noch] 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 process" >mastoid process of the temporal bones.Rivinus' notch (tympanic notch) a defect in the upper tympanic part of the temporal bone, filled by the upper portion of the tympanic membrane. Called also Rivinus' or tympanic incisure.