Fig. 3
From: Analysis of the obstetrician's posture and movements during a simulated forceps delivery
Mannequin instrumented with technical markers. a shows a mannequin instrumented with markers placed on the umbilicus (M1), the distal end of the sacrum (M2), the two sciatic spines (M3), and the lower edge of the pubic symphysis (M4). a and b show markers (MT) positioned on the mannequin's board to define a technical coordinate system necessary to reconstruct the maternal planes of interest