Acupuncture Point Tianxi (SP18)
Location:
Supine position; firstly, locate RuzhongST17 (Ruzhong (ST17)), 2 cun laterally apart from RuzhongST17 (ST17), just in the 4th intercostal space.

Function:
Regulating the flow of qi, promoting the dispersing function of and promoting lactation.

Regional Anatomy:
18 Skin-subcutaneous tissue-greater pectoral muscle-smaller pectoral muscle.
In the superficial layer, there are the lateral cutaneous branches of the 4th inercostal nerve and the tributaries of the thoracoepigastric vein. In the deeplayer, there are the branches of the medial pectoral nerve and the lateral pectoral nerve, the pectoral branches of the thoracoacromial artery vein and the branches or tributaries of the lateral thoracic artery and vein.

Indications:
Fullness and pain in the chest and hypochondrium, cough, hiccup, mastitis, and galactozemia.

Prescription:
Combined use with Acupuncture Single Point Jianjing and Tianzong (SI 11) for treatment of mastitis; with Houxi (SI 3) Shu-Stream Point, The Eight Confluent Point) for treatment of galactozemia; with Chize (LU5)He-Sea Point) for treatment of tracheitis.

Methods:
Insert the needle obliquely 1.0-1.5 cun deep; needling response: local senastion of distension; moxibustion: using 3-5 moxa-cones, mild moxibustion for 15 min.
Note:
Don`t puncture deeply, or else the needle would penetrate the external intercostal muscles-the internal intercostal muscles-the parietal pleura-the pleural cavity-the visceral pleura
and the lung by its tip, and cause an injury to lung, leading to pneumatothorax.