ligament

nouns

a sheet or band of tough fibrous tissue connecting bones or cartilages or supporting muscles or organs
is a part of
the muscular system of an organism
is a type of (narrower)
tissue of mesodermal origin consisting of e.g. collagen fibroblasts and fatty cells; supports organs and fills spaces between them and forms tendons and ligaments
any connection or unifying bond
is a type of (narrower)
a connection that fastens things together