Course
This channel commences from the chest where it exits from its pertaining organ,the pericardium.Then it descends the diaphragm and links up with the triple warmers in the upper,the middle and the lower portions of the body cavity.
One of its branches runs along the chest,through the costal region at a point 3 cun below the armpit,and ascends to the axilla.From the medial aspect of the upper arm,it makes its way downwards between the Lung Channel and the Heart Channel,and reaches the cubital fossa. From there it runs still further downwards to the forearm between the tendons of m. palmaris longus and m. flexorcarpi,and enters the palm.It runs along the middle finger to its tip(Point Zhongchong,PC9).
Another branch of its leaves the palm(Point Laogong,PC8),runs along the ring finger to its tip(Point Guanchong,SJ1),and connects with the Triple Warmer Channel of Hand-Shaoyang.

Zhongchong(PC9)
Location: At the centre of the tip of the middle finger.
Indications: Precordial pain, irritability, coma, swelling pain and stiffness of the tongue, fever, heat stroke.convulsion, feverish sensation m the palms.
Method: Puncture superficially 0.1 inch or prick with a three-edged needle to cause bleeding. Moxibustion is applicable.
Regional anatomy
Vasculature: The arterial and venous network formed by the palmar digital proprial artery and vein.
Innervation: The palmar digital proprial nerve of the median nerve.

The lung Meridian picture of Zhongchong(PC9) Acupoint	Body surface picture of Zhongchong(PC9) Acupoint
Anatomy picture of Zhongchong(PC9) Acupoint	Section picture of Zhongchong(PC9) Acupoint