Course
The channel originates in the lower part of the abdomen below the umbilicus, makes its downward way through the perineum, then ascends along the middle of the spinal column, and reaches Fengfu(DU16) at the back of the neck where it enters the brain. I1 continues to ascend from Fengfu(DU16), along the midline of the head and passing the vertex, forehead, columella of the nose and the upper lip, then to Yinjiao(DU28).
The branches from this channel connect with the kidney and travel through the heart.

Yamen(GV15)
Locadon:On the nape, 1.5 cun directly above the midpoint of the posterior hairline, below the 1st cervieal vertebra.
Indications: Manic depressive psychosis, epilepsy, deaf-mutism, sudden loss of voice,apoplexy, stiff tongue,pain in the occipital region, stiffness of nape, epistaxis.
Puncture perpendicularly 0.5-0.8 cun. Deep stabbing or puncturing upwards prohibited. The angle and depth should be controlled accurately.
Method:Puncture perpendicularly 0.5-0.8 inch.Neither upward obliquely
nor deep puncture is advisable. It is near the medullary bulb in the deep layer, and the depth and angle of the puncture should be paid strict attention to.
Regional anatomy
Vasculature: The branches of the occipital artery and vein.
Innervation: The third occipital nerve.

The lung Meridian picture of Yamen(GV15) Acupoint	Body surface picture of Yamen(GV15) Acupoint
Anatomy picture of Yamen(GV15) Acupoint	Section picture of Yamen(GV15) Acupoint