The plexor is usually the middle finger of the examiner's right hand is kept flexed so as to form a right angle between the proximal and middle phalanges. During percussion

Percussion (medicine)

Percussion is a method of tapping on a surface to determine the underlying structure, and is used in clinical examinations to assess the condition of the thorax or abdomen. It is one of the four methods of clinical examination, together with inspection, palpation and auscultation...

, the middle finger of examiner's hand is routinely used as pleximeter and the technique involves making series of strokes with the plexor on the pleximeter finger. The strokes are sudden flicking movements arising at the wrist. With each hit, the distal pad (not the tip) of the plexor strikes the middle phalanx of the pleximeter.