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Alternate names: 郄中 xī zhōng, Cleft Center; 血郄 xuè xī, Blood Cleft; 中髎 zhōng xī, Central Cleft; 足太阳所入 zú tài yáng suǒ rù, Entry Point of the Foot Greater Yang; BL-54

Channel: BL, Foot Greater Yáng (tài yáng) Bladder Channel

Modern location: An acupoint located on the posterior aspect of the knee, at the midpoint of the popliteal crease.

Classic location: At the pulsating vessel in the center of the popliteal crease. (Zhēn Jiǔ Jiǎ Yǐ Jīng)

Local anatomy: Superficially, the femoropopliteal vein; deeper and medially, the popliteal vein; at the deepest level, the popliteal artery. The posterior femoral cutaneous nerve, the tibial nerve.

Action: Clears the blood and discharges heat; soothes the sinews and frees the network vessels; dispels wind-dampness; disinhibits the lumbus and knees.

Modern indications: Lumbar pain; wilting-impediment (wěi bì) of the lower limbs; abdominal pain; vomiting and diarrhea; inhibited urination; enuresis; cinnabar toxin (dān dú).

Classic indications: Absence of sweating in febrile disease; persistent nosebleed; night sweating; wind-damp loss of locomotive ability; sudden turmoil (cholera) with gripping pain in the heart [region] and abdomen; clove sores (dīng chuāng); welling- and flat-abscesses (yōng jū); aching among the lower teeth; throat disorders.

Needle stimulus: Needling: 0.5‒1.5 cùn perpendicular insertion; bleed with three-edged needle (avoid deep lancing). Moxa: 3‒5 cones; pole 5 min.

Needle sensation: Distension and numbness, sometimes spreading to the soles of the feet.

Point groups: Uniting (hé) (earth) point; command point (sì zǒng xué) of the back; one of Mǎ Dān-Yáng's twelve heavenly star points.

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