The lacrimal canaliculi are small, narrow channels that drain tears from the eye into the lacrimal sac. They can be referred to by a number of synonyms such as the tear ducts, lacrimal ducts, or simply canaliculi. Other similar terms include the nasal duct, which refers to the portion of the canaliculi that extends into the nasal cavity, and the lacrimal punctum, which are small openings in the inner corners of the eyelids where the canaliculi begin. These terms are often used interchangeably in medical literature and can be helpful in understanding the anatomy and function of the tear drainage system.