BL39 (Weiyang, “Weiyang”) is the Lower He-Sea of the Sanjiao point of the Bladder Meridian. It is located on the lateral aspect of the popliteal fossa, medial to the tendon of the biceps femoris muscle. The point is found with the knee flexed, in the depression at the lateral end of the transverse popliteal crease. It regulates the Sanjiao, opens the water passages, resolves dampness, and strengthens the lumbar region and legs.
On the lateral aspect of the popliteal fossa, medial to the tendon of the biceps femoris muscle. The point is found with the knee flexed, in the depression at the lateral end of the transverse popliteal crease.
Perpendicular insertion 0.5 to 1.0 cun. Caution should be exercised to avoid the common peroneal nerve, which is located medially to the biceps femoris tendon in this area.
Regulates the Sanjiao, opens the water passages, resolves dampness, and strengthens the lumbar region and legs.
Axillary swelling, emotional instability , body heat, sudden fainting with corpse-like rigidity, flaccidity and numbness , urinary dripping, difficult urination, lower abdominal hardness and pain radiating to the genitals, involuntary urination, leg cramping and pain, inability to bend or extend the leg, stiffness and pain in the lumbar region preventing flexion and extension, chest fullness, epilepsy, shivering with white urine, urinary retention , genital twitching .
As the Lower He-Sea point of the Sanjiao, Weiyang is a primary point for regulating the water passages, particularly in the lower jiao. It is classically indicated for urinary disorders such as retention, difficulty, and incontinence, especially when accompanied by lower abdominal tension. Its location also makes it effective for stiffness and pain in the lumbar spine and popliteal fossa, particularly conditions involving leg cramping or difficulty with flexion and extension of the knee.
Classical text; the translation was prepared with AI and is not clinical advice.
《醫學綱目·刺灸》 Yīxué Gāngmù · Cìjiǔ — Outline of Medicine: Needling and Moxibustion, Lou Ying, 1565 · 卷之八·陰陽臟腑部 · 穴法上 · Source: jicheng.tw ↗
委陽，在足太陽之前，少陽之後，出於膕中外廉兩筋間，承扶下六寸，此足太陽之別絡According to this text, citing the Tongren, BL39 lies in front of the foot taiyang and behind the shaoyang, between the two tendons at the outer edge of the back of the knee, 6 cun below Chengfu, and is a divergent connecting point of the foot taiyang.
《針方六集》 Zhēnfāng Liùjí — Six Collections on Needling, Wu Kun, 1618 · 卷之五·紛署集 · 足太陽及股並陽蹻六穴凡三十六穴第三十四 · Source: jicheng.tw ↗
委陽二穴，主腰脊痛不可俯仰，股陰痛不得小便，風痹，淋瀝，瘛瘲，癲疾，小腹堅，傷寒寒熱The text records that BL39 was used for lumbar pain preventing bending, inner thigh pain with inability to urinate, wind-bi, dribbling urination, convulsions, epilepsy-like madness, hardness of the lower abdomen and chills and fever from cold damage.
《針灸甲乙經》 Zhēnjiǔ Jiǎyǐ Jīng — Systematic Classic of Acupuncture & Moxibustion, c. 256–282 · 卷09 · Source: Wikisource ↗
胸滿膨膨然，實則癃閉，腋下腫，虛則遺溺，腳急兢兢然，筋急痛，不得大小便，腰痛引腹不得俯仰，委陽主之The text records that BL39 was used for distended chest fullness, urinary retention and armpit swelling in excess conditions, enuresis in deficiency, trembling tightness of the legs, painful tight sinews, inability to pass urine or stool, and low back pain pulling on the abdomen preventing bending.
BL39 is one of 67 points on the Bladder Meridian. Nearby points:
BL39 (Weiyang) is located on the lateral aspect of the popliteal fossa, medial to the tendon of the biceps femoris muscle. The point is found with the knee flexed, in the depression at the lateral end of the transverse popliteal crease.
BL39 regulates the Sanjiao, opens the water passages, resolves dampness, and strengthens the lumbar region and legs. Common clinical indications include axillary swelling, emotional instability , body heat, sudden fainting with corpse-like rigidity, flaccidity and numbness , urinary dripping, difficult urination, lower abdominal hardness and pain radiating to the genitals, involuntary urination, leg cramping and pain, inability to bend or extend the leg, stiffness and pain in the lumbar region preventing flexion and extension, chest fullness, epilepsy, shivering with white urine, urinary retention , genital twitching.
Perpendicular insertion 0.5 to 1.0 cun. Caution should be exercised to avoid the common peroneal nerve, which is located medially to the biceps femoris tendon in this area.
BL39 is a point on the Bladder Meridian (Zú Tài Yáng Páng Guāng Jīng).