lachrymal duct, lacrimal duct, tear duct - any of several small ducts that carry tears from the lacrimal glands nasolacrimal duct - a duct that carries tears from the lacrimal sac to the nasal cavity Haversian canal - any of the many tiny canals that contain blood vessels and connective tiss...
The body cavity of insects consists of a series of sinuses collectively referred to as the hemocele. The only closed portion of the circulatory system is the dorsal vessel, a muscular tube that extends the length of the body from the posterior end of the abdomen into the head (Figure...