1) Longitude lines 
TCM are the channels through which qi flows, connecting the several zang-fu organ pairs. There is no known anatomical or histological basis for the existence of acupuncture points or meridians.
The energy channels which run through the body and are used in acupuncture, reflexology and other similar therapies
Classical loci in acupuncture. They are main and collateral channels, regarded as a network of passages, through which vital energy circulates and along which acupoints (acupuncture points) are distributed. The meridians are a series of 14 lines upon which more than 400 acupoints are located on the body. ... (12 Dec 1998) ... 
There are pathways in the body through which energy flows and Qi passes through. It is in these plac
The invisible channels of energy flow in the body according to Asian medical systems.
Energy pathways which run along twelve major routes in the body; each meridian is linked to specific internals organs and organ systems in the body. Great circles that pass through both the north and south poles, also called lines of longitude. 
According to the tradition on which the practices of acupuncture and acupressure are based, meridians are the pathways along which the body's vital energy flows