THE BIRTH THE BIRTH CANALCANAL

Dr. Radu Alexandru PintilieDr. Radu Alexandru Pintilie

- the bony pelvis -- the bony pelvis -

THE BIRTH CANALTHE BIRTH CANAL

The true pelvis is an obliqualy truncated, bent cylinder

The pelvis forms a bony ring through which the body weight is transmitted to the lower extremities

Sacrospinous ligament

Sacrotuberous ligament

Sacroiliac syncondroses

Symphisys pubis

Sacrospinous ligament

Sacrotuberous ligament

1=11 cm 2=12.5 cm 3=13.5 cm 5=12-12.5 cm

5

1 2

3 4

1 - gynaecoid

2 - android

3 - platypelloid

4 - anthropoid

PELVIC TYPES

True conjugate

Obstetrical conjugate ˃10 cm

Diagonal conjugate – 12 cm

11.5 cm

9 cm

11 cm

1 – first plane of Hodge2 – the descending cilinder( Pigeaud )3 – the releasing triangle ( Fochier )

The base of Trillat triangle

The romb of Michaelis

PELVIMETRY

PELVIMETRY

PELVIMETRY

THE BIRTH CANAL

-soft tissues of the pelvis-

-fetus as a passenger--fetus as a passenger-

FETUS AT TERMFETUS AT TERM

The sacro-femural diameter (9 cm)

The sacro-pretibial diameter (12 cm) The

bitrohanterian diameter (9-10 cm)