# XB13 Tunzhong (Buttock Middle) – Extra Points: Back

臀中 · tún zhōng

Location: At the centre of the buttock, 3.5 thumb widths lateral to the posterior midline, on the level of the 4th sacral foramen..

Cautions: Caution with sciatic nerve.

Canonical page: https://acuiq.com/points/xb13

## Indications

An indication list is a reference index, not a prescription – see the protocols below for sourced treatments.

Open Channel, Open Channel, Open Luo Vessels Locally, Open Luo Vessels Locally, Sciatica

---

AcuiQ-authored prose (symptom and meridian descriptions, the wiki, the auricular crosswalk) is licensed CC-BY-4.0: https://creativecommons.org/licenses/by/4.0/. The assembled protocol compilation is not: build on it with attribution, but do not redistribute it whole as a dataset – https://acuiq.com/terms. The underlying findings are the cited sources' claims – each entry carries its citation; verify against the source before relying on it. Not medical advice: https://acuiq.com/terms