The term papilla (plural: papillae) generally means a nipple-like structure, and may refer to:

  • Mammary papilla, or nipple
  • Amphibian papilla and basal papilla, part of the inner ear of the frog.
  • Interdental papilla, part of the gingiva between teeth
  • Dental papilla, cells involved in a developing tooth
  • Renal papilla, in the kidney
  • Lacrimal papilla, on the eyelid
  • Major duodenal papilla, the opening of the pancreatic duct and common bile duct into the duodenum
  • Minor duodenal papilla, the opening of the accessory pancreatic duct into the duodenum
  • Dermal papillae, at the base of every hair follicle
  • Papillary thyroid cancer, a type of disease
  • Papilloma, a benign epithelial tumor
  • Papillary muscle, a muscle in the heart
  • Cuticular papilla, a raised thickening in plant cuticle, not large enough to be considered a trichome or hair

On the tongue

  • Circumvallate papillae (contains taste buds)
  • Fungiform papilla (contains taste buds)
  • Filiform papilla (does not contain taste buds)
  • Foliate papillae (contains taste buds)

On a fish

  • Genital papilla, a small tube on fish anatomy, through which eggs or sperm are released
  • Papilla (fish mouth structure), small lumps of dermal tissue found in the mouth which hold taste buds
  • The sensory papillae of the Amblyopsidae (cavefishes)

On a sea cucumber

  • Papillae, conical fleshy protuberances on a sea cucumber.

On a mushroom

  • papilla (mycology), an acutely nipple-shaped protrusion in the center of the cap