POINT: UB-33 (URINARY BLADDER-55)

English:	Middle Crevice
Also Known As:	Central Crevice

Over the third posterior sacral foramen.
On the sacrum, medial and inferior to UB-32 Ciliao, just at the third posterior sacral foramen.

Perpendicular insertion 0.5 to 1 cun, or 1.5 to 2 cun through the foramen.
Straight insertion 1 to 2 cun. Sensation: distention and soreness in the sacral region, sometimes extending to the legs.
Note: when locating the foramen, the fingers can be used to find the hole into which the needle is inserted. If the foramen cannot be found, withdraw the needle slightly and try a different angle.
Located within the eight sacral foramina.
Puncture perpendicularly, 0.8 to 1.2 cun.
Moxibustion is applicable.

REN-5 Shimen UB-57 Chengshan LIV-3 Taichong REN-12 Zhongwan KI-3 Taixi KI-4 Dazhong UB-56 Chengjin	UB-39 Weiyang UB-52 Zhishi	UB-31 Shangliao UB-32 Ciliao UB-34 Xialiao SP-6 Sanyinjiao REN-4 joined to REN-3 **Guanyuan joined to Zhongji**
Difficulty defecating	Dribbling urination	Dysmenorrhea
UB-31 Shangliao UB-32 Ciliao UB-34 Xialiao ST-36 Zusanli SP-6 *Sanyinjiao* SP-10 Xuehai M-CA-18 Zigong REN-6 Qihai REN-4 Guanyuan	UB-31 Shangliao UB-32 Zhongliao UB-34 Xialiao DU-1 Changqiang UB-57 Chengshan
Dysfunctional uterine bleeding	Anal fissures

UB-31, Shangliao, UB-32 Ciliao, UB-33 Zhongliao and UB-34 Xialiao are considered a group of points known as the Eight Crevices (Eight Seams) Baliao. They share the characteristics of regulating the urinary system, (UB-32 Ciliao and to a lesser extent UB-33 Zhongliao are the strongest), the Intestines (UB-34 Xialiao has the widest effect), gynecological disorders (UB-34 Xialiao has the strongest effect) and moving Qi and Blood in the channels and collaterals of the local area and the lower limbs (UB-32 Ciliao and UB-33 Zhongliao are the strongest).
All four of these points tonify the Kidneys.
They are specific for genital disorders.
They tonify the whole body.
These points can induce labor.
This point has more of an influence on the Bladder.