[TA] branch to the submandibular ganglion composed of postsynaptic sympathetic fibers from the internal carotid plexus conveyed largely by a periarterial plexus of the facial artery. Synonym(s): radix sympathica ganglii submandibularis [TA], ramus sympathicus (sympatheticus) ad ganglion submandibulare, sympathetic branch to submandibular ganglion