LOCATION
On the ulnarside of hand, when a loose fist is made, proximal to the 5th metacarpophalangeal joint, at the top of the transverse crease and the border of red and white skin.
Features
Shu/Stream Point; One of the Eight Confluent Points associating with the Governor Vessel.
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
The dorsal branch of the ulnar nerve, the dorsal arteries and veins of the little finger and the dorsal hand vein.
Indication
Headache，epilepsy，schizophCVia，hysteria，facial spasm；tinnitus，deafness，keratitis，hordeolum，nosebleed，tonsillitis；lumbago，stiff neck (caused by cold or an awkward sleeping posture)，shoulder and arm pain；scabies. Master Point of the GV, effects entire pathway. Pain in the scapula, arm a/or hand combine with local points. Stiff neck, cervical strain/sprain, pain of the back or neck. Occipital headaches, combine with local points. Night sweats, combine with HT 6. Clears heat and excess from the head, ears and eyes, eye redness, inflammation, visual dizziness, earache, tinnitus, sore throat. Calms the spirit, anxiety, manic depression.
Combinations
Stiff neck and neck pain，stiff neck (caused by cold or an awkward sleeping posture)：SI 03 & BL 10.
Tinnitus，deafness：SI 03 & TE 17 & SI 19.
Jaundice：SI 03 & PC 08.
Chest and neck pain：SI 03 & LU 07.
Phlegm ，chills and fever：SI 03 & LI 04.
Tertian malaria，intermittent chills，fever ，Hepatomegaly，splenomegalia：SI 03 & GV 14 & PC 05.
Numbness of the fingers：SI 03 & LI 03 & EX-UE9.
Five epilepsy (heart,LRer, spleen, lung and kidney)：SI 03 & CV 15 & HT 07.
穴位
在手掌尺側，微握拳，當第5掌指關節後的遠側掌橫紋頭赤白肉際處。
特點
輸（木）穴；八脈交會穴之一，通督脈。
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
尺神經手背支，指背動、靜脈及手背靜脈網。
適應症
頭痛，癲癇，精神分裂症，癔病，面肌痙攣；耳鳴，耳聾，角膜炎，麥粒腫，鼻出血，扁桃體炎；腰痛，落枕，肩臂痛；疥瘡。
穴位配伍療法
頸項強痛，落枕：1.後谿 2.天柱
耳鳴耳聾：1.後谿 2.翳風 3.聽宮
黃疸：1.後谿 2.勞宮
胸、項痛：1.後谿 2.列缺
痰瘧寒熱：1.後谿 2.合谷
間日瘧，間歇性發冷、發熱、肝脾腫大：1.後谿 2.大椎 3.間使
手指麻痛：1.後谿 2.三間
五癇症(心肝脾肺腎)：1.後谿 2.鳩尾 3.神門