"Connective fibers" refers to the strong and flexible strands that join different parts of the body together. These fibers help provide support and structure to organs, tissues, and muscles, allowing them to work together as a unit. Full definition
Collagen is the protein that forms connective fibers in tissues such as skin, ligaments, cartilage, bones, and teeth. (mindbodygreen.com)
Such vectors have become critical tools for delivering genes to treat disease or to label neurons and their connective fibers with fluorescent colors to map out their locations. (sciencedaily.com)