The lagena (from Greek λάγηνος lágēnos 'flask') is a structure found in humans and in animals.

In the ear, the extremities of the ductus cochlearis are closed; the upper is termed the lagena and is attached to the cupula at the upper part of the helicotrema; the lower is lodged in the recessus cochlearis of the vestibule.

The lagena is part of the vestibular system in fish and amphibians.

In fish, the lagena is implicated in hearing and the registration of vertical linear acceleration,[1] in amphibians is the latter only.

This article incorporates text in the public domain from page 1054 of the 20th edition of Gray's Anatomy (1918)