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{{refimprove|date=August 2010}}
'''Spinnbarkeit''' (English:spinnability), also known as '''fibrosity''', is a biomedical [[rheology]] term which refers to the stringy or stretchy property found to varying degrees in [[mucus]], [[saliva]], [[albumen]] and similar [[viscoelasticity|viscoelastic]] fluids. The term is used especially with reference to [[cervical mucus]] at the time just prior to or during [[ovulation]],<ref>{{cite journal
|title=Observations on Certain Rheological Properties of Human Cervical Secretion.
|author=Clift AF
|journal=Proc R Soc Med |date=November 1945
|volume=39
|issue=1
|pages=1–9
|pmid=19993188
|pmc=2181791
}}</ref> and to [[sputum]], particularly in cases of [[cystic fibrosis]].<ref>{{cite journal
|journal=Adv Drug Deliv Rev
|date=2009-02-27
|volume=61
|issue=2
|pages=86–100
|title=Micro- and macrorheology of mucus.
|vauthors=Lai SK, Wang YY, Wirtz D, Hanes J |pmid=19166889
|pmc=2736374
|doi=10.1016/j.addr.2008.09.012
}}</ref>

Under the influence of [[estrogens]], cervical mucus becomes abundant, clear, and stretchable, and somewhat like egg white. The stretchability of the mucus is described by its spinnbarkeit, from the [[German language|German]] word for the ability ''[[Spinning (textiles)|to be spun]]''. Only such mucus appears to be able to be penetrated by [[spermatozoon|sperm]]. After ovulation, the character of cervical mucus changes, and under the influence of [[progesterone]] it becomes thick, scant, and tacky. Sperm typically cannot penetrate it.

[[Saliva]] does not always exhibit spinnbarkeit, but it can under certain circumstances. The thickness and spinnbarkeit of nasal mucus are factors in whether or not the nose seems to be blocked.

[[Mucociliary transport]] depends on the interaction of fibrous mucus with beating cilia.<ref>{{cite journal
|journal=Braz J Otorhinolaryngol
|date=Sep–Oct 2007
|volume=73
|issue=5
|pages=704–12
|title=Methods for studying mucociliary transport
|author1=Trindade SH |author2=de Mello JF Jr |author3=Mion Ode G |author4=Lorenzi-Filho G |author5=Macchione M |author6=Guimarães ET |author7=Saldiva PH. |pmid=18094814
|url=http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-72992007000500018&lng=en&nrm=iso&tlng=en
}}</ref>

==References==
{{reflist}}

[[Category:Gynaecology]]
[[Category:Medical terminology]]
[[Category:German words and phrases]]

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