Canaliculitis is inflammation of the lacrimal canaliculus. It is smaller and shorter than the inferior lacrimal canaliculus. The opening of each canaliculus is the lacrimal punctum. The superior lacrimal canaliculus is located in the upper eyelid. The inferior lacrimal canaliculus is located in the lower eyelid. It joins the rest of the facial nerve via the canaliculus for chorda tympani. "P. canaliculus" is endemic to New Zealand. A canaliculus is an adaptation found on gastric parietal cells. In anatomy, a canaliculus is a small passageway. "Perna canaliculus" occurs around all of New Zealand's mainland. At the bend, the canaliculus is dilated and called the ampulla. "Perna canaliculus" inhibits the 5-lipoxygenase pathway, which leads to the formation of leukotrienes.