Cowper's gland lachrymal gland secretory organ cervical glands of the uterus secreter secretor tear gland cervical glands digestive gland sudoriferous gland exocrine lacrimal gland seminal vesicle vestibular gland gland sweat gland mammary gland oil gland exocrine gland pancreas bulbourethral gland nabothian gland salivary gland glandulae cervicales uteri mamma

ductless gland exocrine secretory organ duct gland silk gland sericterium secreter secretor acinus organ exocrine gland serictery green gland endocrine gland endocrine

canalis vertebralis vagina vertebral canal pancreatic duct canal of Schlemm passage epithelial duct bile duct canalis cervicis uteri ductus deferens alimentary canal digestive tract gastrointestinal tract urethra canaliculus cartilaginous tube spinal canal ampulla Sylvian aqueduct lachrymal duct passageway ductule ejaculatory duct hepatic duct lymphatic vessel epididymis alimentary tract Schlemm's canal sinus ductulus common bile duct lymph vessel tear duct digestive tube inguinal canal umbilical GI tract canalis inguinalis sinus venosus sclerae salivary duct cervical canal seminal duct canal venous sinus Haversian canal bronchiole aqueductus cerebri ureter umbilical cord pore nasolacrimal duct channel lactiferous duct lacrimal duct cerebral aqueduct vas deferens

laticifer plant structure plant part vascular plant tracheophyte

airway air-intake air duct conduit air passage