The Kidney Sinew Channel originates beneath the little toe.
After crossing the foot sole diagonally, it connects to the Spleen Sinew Channel and binds at the medial malleolus.
A small branch travels to the calcaneus from there.
The main Sinew Channel ascends the posteromedial aspect of the leg and binds at the medial condyle of the tibia.
Crossing the Bladder Sinew Channel, it continues running up along the medial surface of the thigh and binds above the external genitalia around Zhongji REN-3 and Qugu REN-2, where it also connects to other Yin Sinew Channels.
Then an internal branch runs through the abdomen, ascending the spinal vertebrae all the way to the neck nape, where it connects to the Bladder Sinew Channel, around Tianzhu BL-10.