An infundibulum (Latin for funnel; plural, infundibula) is a funnel-shape cavity or organ.

• Lungs: The alveolar sacs of the lungs from which the air chambers (alveoli) open are called infundibula.

• Heart: The outflow portion of the right ventricle, the infundibulum of the heart, is another name for the conus arteriosus.

• Ovaries: The end of the mammalian oviduct nearest to the ovary is the infundibulum of uterine tube.

• Brain: A small outgrowth of the ventral wall of the embryonic brain from which the pars nervosa (the posterior lobe) of the pituitary gland develops is also called the infundibulum. (Another name for this structure is the pituitary stalk.)

• Kidney: Part of the collecting system in the kidneys. Urine flows from the calyces, through the infundibula into the renal pelves.

• Ethmoid bone: Ethmoidal infundibulum

• From the science fiction novel The Sirens of Titan by Kurt Vonnegut the phenomenon chronosynclastic infundibulum is defined as "those places ... where all the different kinds of truths fit together".

• Geometry The arc of a sphere or any portion of the perfect circle.

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.