saccule
Noun
Meaning
A little sac; specifically, the sacculus of the ear.
Source: Webster's dictionarySynonyms
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Although many fish are capable of hearing, the lagena is, at best, a short diverticulum of the saccule, and appears to have no role in sensation of sound.
However, they often lack a basilar papilla, having instead an entirely separate set of sensory cells at the upper edge of the saccule, referred to as the papilla amphibiorum, which appear to have the same function.
The central part of the system consists of two chambers, the saccule and utricle, each of which includes one or two small clusters of sensory hair cells.
Three semicircular ducts and two chambers, which contain the saccule and utricle, enable the body to detect any deviation from equilibrium.