turn, twist
· Vrtlog vortex, variant of vertex "an eddy of water, wind, or flame; whirlpool; whirlwind," from stem of vertere "to turn" (see versus). Plural form is vortices. Became prominent in 17c. theories of astrophysics (by Descartes, etc.).
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http://www.kamlingtrading.com/spiralalgae-eng.htmspiralne alge[1]
http://books.google.hr/books?id=tYIugBXCJZMC&pg=PA118&lpg=PA118&dq=spiral+atherosclerotic+plaque&source=bl&ots=
lf4wvGSGcY&sig=FEEQY-Yd20Puz7R57waraLZmrOs&hl=hr#v=onepage&q
=spiral%20atherosclerotic%20plaque&f=false
[1]
http://www.marcusrohrerspirulina.com/files/1013/0143/0494/13190079466_ZQ2Cq.jpg