LOCATION
1 cun lateral, 5 cun lateral to the anterior midline and slightly superior to the nipple, in the 4th intercostal space.
Features
Entry Point.
Body Inches (cun)
Each person has his/her own personal body inches.
One cun is equal to the width of the Knuckle of the thumb.
Nerves, vascular
The muscular branches of the anterior thoracic nerve, the fourth intercostal nerve and the veins of the chest and abdominal wall, and the branches of the external chest arteries and veins.
Indication
Anginapectoris，epicardium；mastitis，insufficient lactation；tuberculosis，lymph nodes，axillary lymphadenitis；intercostal nerve pain，hyperemia. Window of the Sky Point, fullness of the chest, counterflow qi, headache, axillary sweating, blurred vision. Breast disorders, insufficient lactation.
Combinations
Mastitis：PC 01 & ST 17.
Anginapectoris：PC 01 & PC 06.
Axillary lymphadenitis：PC 01 & BL 39 & HT 01.
Swollen of the axilla：BL 39 & PC 01.
穴位
在胸部，當第四肋間隙，乳頭外1寸，前正中線旁開5寸。
特點
交會穴，通足厥陰、足少陽。
同身寸
針灸取穴比量法。出自《千金要方》。
是指以患者本人體表的某些部位折定分寸，
作为量取穴位的長度單位。
穴區神經血管
胸前神經肌支，第四肋間神經和胸腹壁靜脈，胸外動、靜脈分支。
適應症
心絞痛，心臟外膜炎；乳腺炎，乳汁分泌不足；淋巴結核，腋窩淋巴腺炎；肋間神經痛，腦充血等。
穴位配伍療法
乳癰：1.天池 2.乳中
心絞痛：1.天池 2.內關
腋窩淋巴腺炎：1.天池 2.委陽 3.極泉
腋腫：1.委陽 2.天池