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Choroid plexus
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<p>The choroid plexus, or plica choroidea, is a <a href="/facts/Plexus/m7yyz8Dz">plexus</a> of <a href="/facts/Cell_(biology)/bLM9UQvy">cells</a> that arises from the <a href="/facts/Tela_choroidea/qlQCHUMY">tela choroidea</a> in each of the <a href="/facts/Ventricular_system/VMuY39Kp">ventricles of the brain</a>. Regions of the choroid plexus produce and secrete most of the <a href="/facts/Cerebrospinal_fluid/tcWG7hhv">cerebrospinal fluid</a> (CSF) of the <a href="/facts/Central_nervous_system/k8I6To97">central nervous system</a>. The choroid plexus consists of modified <a href="/facts/Ependymal_cells/eyHxnkyt">ependymal cells</a> surrounding a core of <a href="/facts/Capillary/4BIzKJAe">capillaries</a> and <a href="/facts/Stroma_(tissue)/hBmBHBSC">loose connective tissue</a>. Multiple <a href="/facts/Cilia/C9l436HM">cilia</a> on the ependymal cells move to circulate the cerebrospinal fluid. </p>