ANGLE OF NEEDLE INSERTION
The angle of insertion could be :
Perpendicular (Image 1) : in which the needle is inserted perpendicularly forming a 90 degree angle with the skin surface.Most points on the body can be punctured perpendicularly.
Oblique (Image 2) : in which the needle is inserted obliquely forming a 45 degree angle with the skin surface. Is indicated for puncturing points located where the muscles are thin or close to important viscera (e.g L7 , Ren 15).
Transverse (Image 3) : in which the needle is inserted transversely forming a 15 degree angle with the skin surface.Is indicated for points which have very thin underlying muscle(UB2 , Du20 , Ren17).