The ampullae may also allow the fish to detect changes in water temperature.
There is some scholarly confusion as to how this list relates to the glass and metal ampullae.
Contraction of the ampullae causes the podia to stretch as water is brought into them.
The few other examples are now scattered across the world; this article deals with the whole group of over fifty known ampullae, wherever located.
The cupula itself is the gelatinous component of the crista ampullaris that extends from the crista to the roof of the ampullae.
Souvenirs of pilgrimages to shrines, such as clay or lead badges, medals and ampullae stamped with images were also popular and cheap.
Lateral canals run to both the tube feet and the large oral tentacles, all of which possess ampullae.
The ampullae pores are plainly visible as dark spots in the skin.
