What is the Xi-Cleft point for Yin Wei Mai?

The Xi-Cleft point for Yin Wei Mai is indeed KI-9, also known as Zhu Bin. In Traditional Chinese Medicine, Xi-Cleft points are important locations on the meridians where Qi and blood can gather, serving as significant areas for treating acute conditions or issues related to the specific channel.

Yin Wei Mai, or the Yin Linking vessel, is one of the Eight Extraordinary Vessels, which plays a crucial role in connecting and regulating the Yin channels. KI-9 is specifically located on the Kidney meridian and is associated with the Yin aspect of the body's energy, making it a fitting Xi-Cleft point for this vessel. The role of this point extends to addressing emotional aspects and balancing the internal organs that pertain to Yin energy.

The other choices do not serve as Xi-Cleft points for Yin Wei Mai. KI-8 is known as Jiao Xin and relates to the Yin Qiao Mai, and while KI-5 and SP-4 have their own significance, they are not associated with the Xi-Cleft of Yin Wei Mai. Thus, selecting KI-9 as the correct answer aligns with its specific role in TCM practices for regulating Yin energy and addressing related health conditions.