Kalmar "Nervus Trigeminus" tana nufin jijiya na cranial na biyar, wanda kuma aka sani da jijiyar trigeminal. Haɗaɗɗen jijiyoyi ne da ke da aiki na hankali da na motsa jiki, kuma tana da alhakin ba da jin daɗi ga fuska, fatar kai, da maƙarƙashiya na baki da hanci, da kuma sarrafa tsokoki na mastication (taunawa). Jijiya na trigeminal yana da manyan rassa guda uku, kowannensu yana ba da wani yanki na fuska daban-daban: reshen ido, reshen maxillary, da reshen mandibular. Duk wani aiki na wannan jijiyar zai iya haifar da yanayi iri-iri, kamar trigeminal neuralgia, cuta mai raɗaɗi da ke shafar fuska.