Tunzhong EX-B

Chinese: 臀中

Pinyin: Tún Zhōng


At the center of the buttock, 3.5 cun lateral to the posterior midline, on the level of the 4th sacral foramen

How to locate

First identify the Tuffier's line which connects the highest points of the iliac crest. The spinous process  of the 4th lumber vertebra (L4) mostly falls on this line. 

Then palpate in an inferior direction, passing L5, and reach the most superior sacral spinous process. Palpate in a lateral direction on the level of the sacral processes for the depression of the sacral foramina

Tunzhong EX-B is at the same level as the 4th foramina and 3.5 cun lateral to the posterior midline. 

Main actions

Opens the local Channel and Luo Vessels


Vertically 2–3 cun. 

Commentary for Tunzhong EX-B

Tunzhong EX-B is not an official Extra point.