ferning(redirected from Ferning Reaction)
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1. A term used to describe the pattern of arborization produced by cervical mucus, secreted at midcycle, on crystallization, when it somewhat resembles a fern or a palm leaf.
2. Synonym(s): filigree burn
Cytology A palm leaf-like pattern seen in dried endocervical mucus, consisting of a branched heterogeneous network of crystallised glycoprotein, NaCl and KCl salts, which forms a parallel canalicular system facilitating sperm penetration; it is induced by oestrogen and seen from days 7-18, peaking on day 14 of the menstrual cycle
Endometrium Complex branching of endometrial glands, which is histologic evidence that ovulation has occurred; other parameters corroborating ovulation include subnucleolar vacuolization with palisading of the gland cells, stromal ‘decidualization’, glandular necrosis, vascular thrombosis, inflammation and aggregates of stromal cells
Pattern of arborization produced by a thin film of cervical mucus, secreted at midcycle, on drying, which somewhat resembles a fern or a palm leaf.