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. 2017 Jan 2;35(2):153–155. doi: 10.1136/acupmed-2016-011216

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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(A) Funnel-shaped morphology of the adult pterygomaxillary fissure.The yellow arrow indicates a funnel-shaped adult pterygomaxillary fissure. (B) Jagged morphology of the pterygomaxillary fissure that could affect the acupuncture procedure. The red arrow indicates the jagged adult pterygomaxillary fissure. (C) Needle approaching the pterygopalatine segment of the maxillary artery The red arrow indicates the needle approaching the pterygopalatine segment of the maxillary artery; the yellow arrow indicates the lumen of the pterygopalatine segment of the maxillary artery.