Papilla

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