incisure (in-sI´zhur)

notch [L. incisura]
Lanterman's i.'s Schmidt-Lanterman i.'s
Rivinus' i. tympanic notch
Santorini's i.'s notches in cartilage of external acoustic meatus, under notch
Schmidt-Lanterman i.'s funnel-shaped interruptions in the regular structure of the myelin sheath of nerve fibers, formerly interpreted as actual breaks in the sheath but shown by electron microscopy to correspond each to a strand of cytoplasm locally separating the two otherwise fused oligodendroglial (or, in peripheral nerves, Schwann cell) membranes composing the myelin sheath.Lanterman's i.'s, Schmidt-Lanterman clefts;
tympanic i. tympanic notch


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