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Write an essay on Parturition in Human.

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Parturition:

  • In the rabbit, man & other eutherians embryonic development completes in the uterus which is followed by the birth of young ones. It is called parturition.
  • The duration between the fertilization & the parturition is called gestation.
  • The gestation is different in, the different species.
  • In the rabbit, it is of 28 – 30 days and in man is 270 to 280 days. In the rabbit, the young ones are hairless, blind & deaf.
  • They become normal in 5 to 7 days. Parturition is a hormonal process which involves many hormones.
  • At the completion of the embryonic development, the pituitary increases the secretion of FSH, decreases the secretion of
  • LH & begins the secretion of oxytocin & MH.
  • Decreased LH, in turn, decreases the secretion of progesterone.
  • As a result, the placenta gets dissolved and the foetus separates from the uterine wall.
  • Increased FSH restarts oogenesis.
  • Oxytocin is the main hormone of parturition.
  • It causes labour pains by contracting the uterine muscles.
  • The contractions in the uterus push the foetus into the vagina.
  • Relaxin in man is secreted by the corpus luteum and.in rabbit by the placenta.
  • This hormone provides broad passage for parturition by relaxing pubic symphysis of the pelvic girdle.

Endocrine control of parturition

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