[Location] Localized in the erect sitting position and with arm holddown unforced, on the facies medialis brachii, extend the transverse striation of armpit's anterior border outward to humerus' posterior border, the point is at that place. ( Fig.103 )
 
[Regional Anatomy] Skin→subcutaneous tissue→brachial muscle. Superficial layer, the distribution of cephalic vein, nervus cutaneus brachii lateralis; deep layer, muscular branch of brachial artery and vein, and branch of musculocutaneous nerve.