Line drawing in ink and brush style from an anonymous manuscript probably dating from the end of the Qing period (1644-1911). Yinwei mai (Yin Tie Vessel) is one of the Eight Extraordinary Channels (Qi jing ba mai). Originating at the zhubin (Guest House) point on the foot shaoyin channel,it runs up the inner part of the thigh. It ascends to the diaphragm and the Adam's Apple, where it comes into confluence with renmai (the Director Vessel, often translated as Conception Vessel), and thence to the lianquan (Edge Spring) point at the root of the tongue, where it terminates. Acu-moxa locations on this channel include zhubin (Guest House), fushe (Official Lodge), daheng (Great Horizontal), fu'ai (Abdomen Sorrow), qimen (Portal of Times), tiantu (Celestial Prominence) and lianquan (Edge Spring). According to current teaching, changes in the channel cause pain in the heart and chest (xinxiong tengtong).
