常见不规则复数形式

colliculus - colliculi
datum - data
fasciculus - fasciculi
formula - formulae

radius - radii
cerebrum - cerebra
cerebellum - cerebellar
gyrus - gyri /gairi/
sulcus - sulci /~kai/
meninx - meninges
nucleus - nuclei
ganglion - ganglia

papilla - papillae
vertex - vertices