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fontanel n. 囟;排膿口 囟;排膿口 fontanel n 1: any membranous gap between the bones of the cranium in an infant or fetus [synonym: {fontanelle}, {fontanel}, {soft spot}] Fontanel \Fon"ta*nel`\, n. [F. fontanelle, prop., a little
fountain, fr. fontaine fountain. See {Fountain}.] 1. (Med.) An issue or artificial ulcer for the discharge of humors from the body.[Obs.] --Wiseman. [1913 Webster] 2. (Anat.) One of the membranous intervals between the incompleted angles of the parietal and neighboring bones of a fetal or young skull; -- so called because it exhibits a rhythmical pulsation. [1913 Webster] Note: In the human fetus there are six fontanels, of which the anterior, or bregmatic, situated at the junction of the coronal and sagittal sutures, is much the largest, and remains open a considerable time after birth. [1913 Webster]
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