Ferning in Cervical mucus

Collection 000022: Mucus from the Cervix changes its consistency during the oestrus cycle.  It is only receptive to sperm at the correct time of the cycle when the egg is released. A sample taken at this time and allowed to dry will crystallise and form rather beautiful fern-like structures under the microscope. It will not do this at other points in the cycle when it is generally unreceptive and even lethal to sperm.


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© David Barlow 2018