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Channel: PC, hand reverting yīn (jué yīn) pericardium channel

Modern location: An acupoint located a little more than 1 fēn below the base of the nail on the radial side of the middle finger.

Classical location: At the tip of the middle finger, in the depression the width of a garlic chive leaf away from the nail. From The Great Compendium of Acupuncture and Moxibustion (针灸大成 zhēn jiǔ dà chéng)

Local anatomy: The arterial and venous network formed by the palmar digital proprial artery and vein. The palmar digital proprial nerve of the median nerve.

Action: Clears the heart and eliminates heat; opens the orifices and resuscitates; returns yáng and stems counterflow.

Modern indications: Heart pain; clouding reversal (loss of consciousness); painful stiff swollen tongue preventing speech; febrile disease; summerheat stroke; night crying in children.

Classical indications: Elbow pain; oppression in the chest; pain in the root of the tongue.

Needle stimulus: Needling: 0.1 cùn upward oblique insertion; or bleed. Moxa: 1 cone; pole 2 min.

Needle sensation: Localized pain.

Point groups: Well (jǐng) (wood) point.

Point name meaning:

• 中 zhōng: center, central, middle (also zhòng, to strike)
• 冲 chōng: a hub, thoroughfare; 〔衝〕 to surge, to flush

The location of PC-9 on the tip of the middle (central) finger makes it a centrally located, strategic point. The name Central Hub reflects this idea. Also, the pericardium channel traverses the center of the inner arm. Though the qì at well (jǐng) points is usually described as small and still like water in a well, numerous sources say that the qì at PC-9 surges forth (采艾编：此其冲气也). Therefore the point name could also be rendered as Central Surge. See acupoint names: origins, meanings, and translations.

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