LOCATION
On the lateral side of the little toe, approx 0.1 cun lateral from the corner of nail.
Features
Jing/Well Point
Body Inches (cun)
Each person has his/her own personal body inches.
One cun is equal to the width of the Knuckle of the thumb.
Nerves, vascular
Proper toe nerve, dorsal lateral cutaneous nerve of foot, dorsal toe artery, and arterial network formed by proper base of toe artery.
Indication
Malposition，difficult labour，placenta；stroke，nervous headache，sequelae of cerebral vascular disease；urinary retention，spermatorrhea；conjunctival hyperemia，cornea white spot，nasal obstruction. Clears pain a/or stagnation from the opposite end of the channel: headache, eye pain, sinus pain, etc. Use with moxa to adjust breech fetal position (generally indirect moxa for 10-20 minutes 1x/day).
Combinations
Headache，eyes pain：BL 67 & GB 20 & BL 02.
Headache and neck pain：GB 20 & EX-HN5 & BL 67.
Itching disease and getting painful：ST 15 & BL 67.
Seminal emission：CV 03 & LR 08 & BL 67.
Detention of the afterbirth，difficult labour：BL 67 & SP 06.
穴位
在足小趾末節外側，距趾甲角0.1寸。
特點
井（金）穴。
同身寸
針灸取穴比量法。出自《千金要方》。
是指以患者本人體表的某些部位折定分寸，
作为量取穴位的長度單位。
穴區神經血管
趾底固有神經，足背外側皮神經，趾背動脈，趾底固有動脈形成的動脈網。
適應症
胎位不正，難產，胎盤滯留；腦溢血，神經性頭痛，腦血管病後遺症；尿瀦留，遺精；眼結膜充血，角膜白斑，鼻塞。
穴位配伍療法
頭痛，目痛：1.至陰 2.風池 3.攢竹
頭項痛：1.風池 2.太陽 3.至陰
癢疾之疼多：1.屋翳 2.至陰
失精：1.中極 2.曲泉 3.至陰
胞衣不下，難產：1.至陰 2.三陰交