Course
This channel commences from the tuner canthus, ascends to the forehead and joins its symmetrical channel at the vertex (Point Baihui. DU20).
One of its branches splits off the vertex and goes to the upper aspecl of the" auricle.
The original channel leaves the vertex for the brain where it re-emerges and runs downward to the back of the neck. Continuing along the medial side of the scapula, it travels parallel to the vertebral column and reaches the lumbar region Passing the paravertehral muscles, it communicates with the kidney and enters into its pertaining organ,the urinary bladder.
The branch from the lumbar region runs downwards parallel to the vertebral column (1.5 individual cun lateral to the back mid-line). through the gluteal region. and into the popliteal fossa.
Another branch emerges from the original channel at the back of the neck. from the medial side of the scapula passes through the scapula, and runs down-parallel to the vertebral column (3 cun lateral to the back mid-line).Then
it runs through the trochanrer major of the femur, downwards along the posterior border of the lateral side of the thigh where it meets the branch descending from the lumbar region in the popliteal fossa. From there, it makes its way down through the muscutus gastrocnemius, emerges from the posterior aspect of the external malleolus, runs along Poinr Jinggu(BL64)to the lateral side of the tip of the small toe (Point Zhiyin, BL67), where it connects with the Kidney Channel of Foot-Shaoyin.

Guanyuanshu(BL26)
Location : On the low back, below the spinous process of the 5th lumbar vertebra, 1.5 cun lateral to the posterior midline.
Indications: Lumbago, distention of abdomen, diarrhea, enuresis, scelalgia, frequency of micturition.
Method: Puncture perpendicularly 0.8-1.2 inches. Moxibustion is applicable.
Regional anatomy
Vasculature: The posterior branches of the lowest lumbar artery and vein.
Innervation: The posterior ramus of the fifth lumbar nerve.

The lung Meridian picture of Guanyuanshu(BL26) Acupoint	Body surface picture of Guanyuanshu(BL26) Acupoint
Anatomy picture of Guanyuanshu(BL26) Acupoint	Section picture of Guanyuanshu(BL26) Acupoint