 Fimbria (bacteriology)

In bacteriology, a fimbria (Latin for 'fringe', plural fimbriae), also referred to as an "attachment pilus" by some scientists, is a type of appendage that is found on many Gram-negative and some Gram-positive bacteria, and that is thinner and shorter than a flagellum.This appendage ranges from 3–10 nanometers in diameter and can be as much as several micrometers long.