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animal locomotion
- In locomotion: Bottom locomotion
  …capped by a hollow muscular ampulla (a small, bladder-like enlargement). When the ampulla contracts, it forces fluid into the tube foot and extends it. Preferential contraction of muscles in the wall of the tube foot controls the direction of and the retraction of the tube foot. When the tube foot…
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sensory reception
- In human sensory reception: Vestibular sense (equilibrium)
  …fluid called endolymph; in the ampulla of each canal are fine hairs equipped with mechanosensing stereocilia and a kinocilium that project into the cupula, a gelatinous component of the ampulla. When rotation begins, the cupula is displaced as the endolymph lags behind, causing the stereocilia to bend toward the kinocilium…
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ductus deferens
- In ductus deferens
  …enlarge to form the two ampullae attached to the outside left and right walls of the bladder.
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semen production
- In semen
  …to another storage area, the ampulla. The ampulla secretes a yellowish fluid, ergothioneine, a substance that reduces (removes oxygen from) chemical compounds, and the ampulla also secretes fructose, a sugar that nourishes the sperm.
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animal
- In animal reproductive system: Accessory glands
  prostate, the bulbourethral, and the ampullary glands, and the seminal vesicles. All are outgrowths of the spermatic duct or of the urethra and all four occur in elephants and horses and in most moles, bats, rodents, rabbits, cattle, and primates. A few members of these groups lack ampullary glands, or…
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