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Abbreviation YIS. One of the eight extraordinary vessels.

Pathway: The yīn linking yīn wéi originates at KI-6 (Shining Sea, 照海 zhào hǎi) below the medial malleolus, runs up the medial aspect of the leg, penetrates the genital region and then continues internally up the abdomen and chest to emerge in the supraclavicular fossa at ST-12 (Empty Basin, 缺盆 quē pén). It proceeds up the throat, passing in front of ST-12 (Empty Basin, 缺盆 quē pén), then continues up the medial aspect of the cheek to the inner canthus, where it joins the foot greater yáng (tài yáng) bladder and yáng springing channels to ascend over the head and enter the brain.

Functions: The main physiological functions of both the yīn (as also the yáng) springing vessels are to control the opening and closing of the eyes, control the ascent of fluids and the descent of qì, and to regulate muscular activity in general.

Signs: Disease signs associated with the yīn springing yīn qiāo vessels include: eye diseases, heavy sensation of the eyelids or inability to open the eyes, clouding sleep, watery eyes, lower abdominal pain, pain along the waist extending into the genitals, hernia, vaginal discharge, and tightness and spasms along the medial aspect of the lower limb, with corresponding flaccidity along its lateral aspect.

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