The membrane in the middle of walnut is called "distraction wood" (the annals of traditional Chinese medicine in Shanxi Province), walnut coat (herbal rejuvenation), nutcracker (modern and practical traditional Chinese medicine) and walnut partition (manual of Chinese herbal medicine in Shandong Province). The source is the wooden diaphragm in walnut kernel. Plant morphology is described in detail in walnut strips. The septum of medicinal wood is thin, curved, broken and irregular. The surface is light brown to brown, or brown-black, with a slight luster. Brittle, fragile, slightly flatulent and slightly bitter. It's better to be big, thin and yellow. Location: Hebei, Shanxi and Shandong. Sexual taste "Herbal rejuvenation": bitter, flat and non-toxic. Meridian tropism "herbal rejuvenation": entering the spleen and kidney. Function indication-The function of Kaixinshu is to strengthen kidney and astringent essence. Treat nocturnal emission, gonorrhea, hematuria, drowning, metrorrhagia, leukorrhagia and diarrhea. 1 update of materia medica: strengthening spleen and kidney. ② Chen Nianzu: Collect astringent essence. ③ Records of Shanxi traditional Chinese medicine: diuresis and clearing heat. Treat gonorrhea, hematuria and diarrhea caused by summer heat. (4) Handbook of Chinese Herbal Medicine: Treatment of legacy drowning and bleeding during collapse. ⑤ Shaanxi Journal of Traditional Chinese Medicine: Treating Deafness. ⑥ Tianjin Chinese herbal medicine: astringent. Treat nocturnal emission, frequent urination, take it off. Oral administration and dosage: decocted, 2 ~ 3 yuan. Prescription ① Treatment of nocturnal emission due to kidney deficiency: two yuan for distraction, four yuan for Euryale ferox, four yuan for Lycium barbarum, eight yuan for Psoralea corylifolia San Qian and oyster. Decoct with water. (Handbook of Chinese Herbal Medicine in Shandong) 2 Treating nephritis: 12 points. Five catties of yellow rice wine, soaked for ten minutes, boiled to remove residue. Take 5 ~ 10 ml each time, three times a day.