Retracted testicles

Testicles drawn upward and into the body. Retracted testicles are usually attributed to disease of the foot reverting yīn (jué yīn) liver channel. The Magic Pivot (灵枢 líng shū, jīng mài) states, When reverting yīn (jué yīn) qì expires, the sinew expires. The reverting yīn (jué yīn) is the liver vessel. The liver is the union of the sinews. The sinews gather at the yīn organs (genitals) and net the root of the tongue. When the vessel loses its luxuriance, the sinews become tense. When the sinews become tense, they pull the tongue and testicles. Hence, green-blue lips, curled tongue, and retracted testicle mean the death of the sinews. This falls within the scope of retracted genitals and retracted scrotum.