Naḍī; Literally river. (Also from nada, a species of hollow reed.) Naḍīs are finely reticulated channels for the conveyance of prāṇa in the etheric vehicle. These channels stem from the three principal ones in the central spinal column (iḍā, piṇgalā and suśumṇā naḍīs). They roughly follow the paths of the nerves and blood stream. There are said to be 72,000 main naḍīs in the etheric vehicle, though this number is symbolic. Each naḍī allows the passage of the five different types of prāṇas, and their combinations. Where naḍīs containing twenty one or more prāṇas intersect then you will find a bīja for the appearance of a important chakra.