👉 The term "canaliculus" refers to a small, narrow opening in the skin or skin vessels that is filled with blood. Canaliculi are typically located on the surface of the skin and are responsible for delivering oxygen and nutrients to the skin's cells. They also help regulate body temperature by allowing air to circulate around the skin. In some cases, canaliculi may be involved in the regulation of fluids in the body, such as through the regulation of blood flow or the metabolism of