Infundibulum

1.

A funnel-shaped or dilated organ or part; as, the infundibulum of the brain, a hollow, conical process, connecting the floor of the third ventricle with the pituitary body; the infundibula of the lungs, the enlarged terminations of the bronchial tubes.

2.

A central cavity in the Ctenophora, into which the gastric sac leads.

3.

The siphon of Cephalopoda.