The hormonal control of birth

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Presentation transcript:

The hormonal control of birth © 2016 Paul Billiet ODWS

Birth © 2016 Paul Billiet ODWS

The beginning of labour: (2 to 24 h before birth) Pituitary Gland Oxytocin stimulates Myometrium (Muscles of the uterus) Irregular contractions 45s to 1 min Pulls cervix open Progesterone from the placenta inhibits Positive feedback Cervix dilating diameter 2 to 8 cm Relaxin stimulates Cervix stretch receptors © 2016 Paul Billiet ODWS

Delivery: 30 min to 2 hours before birth Pituitary Gland Oxytocin stimulates Myometrium Regular contractions 45s to 1 min every 5 min Positive feedback Cervix fully dilated diameter 10 cm Cervix and birth canal stretch receptors Abdominal muscles “bearing down” © 2016 Paul Billiet ODWS

Afterbirth The delivery of the placenta, amniotic sac and the rest of the umbilical cord © 2016 Paul Billiet ODWS

Gestation v size © 2016 Paul Billiet ODWS

Gestation v Size © 2016 Paul Billiet ODWS