Talk:BGDA Practical 12 - Birth: Difference between revisions
From Embryology
mNo edit summary |
|||
Line 20: | Line 20: | ||
! Roles | ! Roles | ||
|- | |- | ||
| Progesterone | | valign=top|Progesterone | ||
| | | | ||
* maintains pregnancy - initially synthesized by corpus luteum, then levels maintained by placenta | * maintains pregnancy - initially synthesized by corpus luteum, then levels maintained by placenta | ||
Line 26: | Line 26: | ||
* Level in plasma may fall just before parturition, definitely decreases following delivery of placenta | * Level in plasma may fall just before parturition, definitely decreases following delivery of placenta | ||
|- | |- | ||
| Estrogens | | valign=top|Estrogens | ||
| | | | ||
* Group of steroidal hormones, peak when parturition begins | * Group of steroidal hormones, peak when parturition begins | ||
Line 35: | Line 35: | ||
* Estriol - synthesized by fetus and placenta | * Estriol - synthesized by fetus and placenta | ||
|- | |- | ||
| Oxytocin | | valign=top|Oxytocin | ||
| | | | ||
* Peptide hormone (8aa) from maternal posterior pituitary, initiation and maintenance of labour (synthetic form labour induction) | * Peptide hormone (8aa) from maternal posterior pituitary, initiation and maintenance of labour (synthetic form labour induction) | ||
Line 41: | Line 41: | ||
* stimulus for release - mechanical stimulation of uterus, cervix and vagina (ethanol inhibits release) | * stimulus for release - mechanical stimulation of uterus, cervix and vagina (ethanol inhibits release) | ||
|- | |- | ||
| Prostaglandins | | valign=top|Prostaglandins | ||
| | | | ||
* hydroxy fatty acids - sythesized by placenta, amniotic fliud contains mainly PGF2 alpha, causes myometrial contraction (also in maternal plasma) | * hydroxy fatty acids - sythesized by placenta, amniotic fliud contains mainly PGF2 alpha, causes myometrial contraction (also in maternal plasma) |
Revision as of 11:50, 2 June 2013
Practical Audio
BGD Cycle A 2010 Audio - Dr Mark Hill Monday 17th May 2010 3-5pm G2G4.
listen Part 6 | download (2.13 Mb MP3 18:36) |
Hormones | Roles |
---|---|
Progesterone |
|
Estrogens |
|
Oxytocin |
|
Prostaglandins |
|
External Environment
- mainly shown in other species parturition occurs in peaceful undisturbed surroundings, stress may have an inhibitory effect on oxytocin release
- Most human births occur at night (peak at 3am) diurnal rhythm influence