All lessons Module 6: Points Lesson 14
Bladder 2: from the sacrum to the little toe
Why does an acupuncturist choose a point in the back of the knee or at the ankle for low back pain, and what does a point on the little toe do in a breech presentation?
After this lesson you can follow the channel from sacrum to toe as a line, you know all points from BL-31 to BL-67 by name and category, you can work out BL-40 and BL-60 as key points, and you can weigh BL-62 and BL-67 side by side, with their limits.
Know by heart
- The course. The inner and outer lines meet in the back of the knee (BL-40); then over the calf, behind the outer ankle, along the outer edge of the foot to the little toe (BL-67), link to KI-1. mnemonic: two lines, one knee.
- The categories. BL-67 Jing-Well, BL-66 Ying-Spring, BL-65 Shu-Stream, BL-64 Yuan, BL-63 Xi, BL-60 Jing-River, BL-58 Luo, BL-40 He-Sea; lower He-Sea: BL-40 Bladder, BL-39 Triple Burner. mnemonic: from the toe 67, 66, 65 in a row, then 64 source and 63 cleft; 60 river, 58 bridge, 40 sea.
- BL-40 Weizhong, Middle of the Crook. He-Sea; command point of the back; low back pain, Heat. mnemonic: Middle of the Crook, middle of every back treatment.
- BL-60 Kunlun, Kunlun Mountains. Jing-River; neck, back, headache; not in pregnancy. mnemonic: a mountain range at the ankle carries the whole back of the body.
- BL-62 and BL-67. BL-62 Shenmai: opening point of the Yang Qiao, partner SI-3; sleep, eyes, neck and back. BL-67 Zhiyin: Jing-Well; moxa for breech presentation, and therefore on the pregnancy list.
- Sacrum and calf. BL-31 to BL-34, the Eight Crevices: sacrum, urine, menstruation; lumbosacral, so pregnancy. BL-57 Chengshan: calf cramp, haemorrhoids.
- Outer line. The five spirits BL-42, 44, 47, 49, 52 (lesson 13), and BL-43 Gaohuangshu for chronic exhaustion.
The rest of this lesson is reference.

Three practice questions from this lesson
Where do the inner and outer Bladder lines meet?
- Behind the ankle, at BL-60
- On the sacrum, at BL-31 to BL-34
- Behind the knee, at BL-40
Answer: Behind the knee, at BL-40. Two lines, one knee: BL-40 Weizhong. BL-31 to BL-34 lie on the sacrum, BL-60 behind the ankle; there it is already one line.
What is the category of BL-40?
- Xi-Cleft; starting point of the Yang Wei
- Luo; bridge to the Kidneys
- He-Sea; command point of the back
Answer: He-Sea; command point of the back. BL-40: He-Sea and lower He-Sea of the Bladder; command point of the back. BL-63 is Xi-Cleft and starting point of the Yang Wei, BL-58 Luo.
Which point is the lower He-Sea point of the Triple Burner?
- BL-22 Sanjiaoshu
- BL-39 Weiyang
- BL-40 Weizhong
Answer: BL-39 Weiyang. BL-39. BL-22 is the Back-Shu point of the Triple Burner (lesson 13).
The rest of this lesson
In the course you get the step-by-step explanation, 16 case-based practice questions, 15 spaced-repetition flashcards, the pitfalls and the bridge to physiology with evidence grades. This lesson belongs to module 6: Points.