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Egg Cell - PowerPoint PPT Presentation


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Egg Cell. Maria Paula Coz, Daniela Mazzetti & Gabriela Echeandía 9ºA. Location. All of the immature egg cells a woman will ever produce are stored in the ovaries by the time she is born .

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EggCell

Maria Paula Coz, Daniela Mazzetti & Gabriela Echeandía 9ºA

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Location

  • All of the immature egg cells a woman will ever produce arestored in the ovariesby the time she is born.
  • During each menstrualcycle, hormonalmessages from the brain cause the ovaries to develop a single mature egg cell for fertilization.
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Ovaries

  • They are a pair of female reproductive organs, located in the pelvis (one on each side of the uterus).
  • The ovaries are connected to each other by the Fallopian tubes. 
  • They are the main source of female hormones (estrogen and progesterone)and they also regulate the menstrual cycle and pregnancy.
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Ovulation

  • Ovulation occurs each month when theovaries are stimulated by the hormones FSH (Follicle Stimulating Hormone) and LH (Leutinizeing Hormone).
  • Once the egg matures it is ovulated, and it travels through the fallopian tubes to the uterus.
  • During Ovulation and immediately after, the uterus lining thickens in preparation for a fertilized egg. 
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Fertilization

  • Fertilization occurs in oviducts (fallopian tubes) of the female reproductive tract.
  • Only one of the approximately 300 million sperm that released into a female's vagina can fertilize the single female egg cell.
  • The successful sperm cell must enter the uterus and swim up the fallopian tube to meet the egg cell, where it passes through the thick coating surrounding the egg.
  • This coating, consisting of sugars and proteins, is known as the “ZonaPellucida”.
  • The ovum is fertilized inside the female body, and the embryo then develops inside the uterus, receiving nutrition directly from the mother.