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Chinese/Japanese Pulse Image chart: Yang Link Channel. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.
Illustration of Yang Link Channel (pulse) from Renyuan maiying guizhi tushuo (Pictorial Handbook of Pulse Images Based on the Person). This is a specialist text on pulse diagnosis attributed to the third-century master Shuhe, edited and revised by Shen Jifen in the Ming period (1368-1644). It discusses various pulse images and the medical conditions to which they relate, and contains 48 pulse image diagrams. This undated edition was engraved and published in Japan.
The text states: Yang Link Channel (yangwei mai) connects with the Yang collateral (yang luo) and runs up to the head. Its pulse image is like an earthworm, long and convoluted. The illnesses related to Yang Link Channel are malign cold (e han), fever, lumbar pain etc.