Illustration of a female pelvis showing a foetus being delivered in the breech position using the Prague manoeuvre. Breech means that the foetus is delivered buttocks or feet first, rather than head first. When the foetus is also positioned facing the mother's back the chin cannot pass easily through the symphysis pubis bone. The Prague manoeuvre extends the foetal body while rotation the head around the symphysis pubis bone. From New Dictionary of Practical Medicine and Surgery by Dr Jaccoud Vol. 39 (1886).