A<unk>  is a structure that binds nerves and veins (and in some cases arteries and lymphatics) with connective tissue so that they travel in tandem through the body.
Neurovascular bundle
Cardiopulmonary nerves
Parasympathetic nervous system
Intrascleral plexus
Cerebrospinal fibers
Postganglionic nerve fibers
Nerve plexus
Preganglionic nerve fibers