Elemental Beginnings Adelaide Doula
  • Home
  • Meet Your Doula
  • My Services
    • Online Doula Services >
      • Birth Plan Review
    • Pregnancy & Birth Coaching
    • Birth Doula
    • Postnatal Doula
    • Placenta Capsules
    • Bereavement Support
    • Umbilical Cord Ties
    • Adelaide Birth Directory
    • Gift Certificates
  • Resources
  • Kind Words
  • Contact Me

educate ~ inspire

The Human Yolk Sac

15/9/2013

0 Comments

 
"From conception until the placenta is mature enough to nourish our babies, they are sustained with nourishment from this yolk sac. Once the placenta functions, the yolk sac generally is obliterated but on occasion there are remnants left behind to remind us of those very early days of prenatal life." ~ Patricia Edmonds
This post does contain pictures of a placenta however I hope you find it as interesting as I do.

Yolk Sac
If you've ever had an early ultrasound one of the first things you might have been shown is the yolk sac which usually develops at around 5 weeks gestation. Doctor's can use it to gauge embryonic development by measuring it's size.  I was lucky enough to see the remnants of one in a placenta I encapsulated and I wanted to learn more about it so I thought I'd share it with you.  The literature contains a lot of medical terms which I have tried to explain as simply as possible so I hope I have them right.  If you see anything that needs correcting please let me know!

Development
The yolk sac is established during the second week of embryonic development.  Some cells that form in the upper part of the yolk sac develop capillaries and manufacture blood cells for the embryo.  The lower part of the sac develops tiny, finger-like projections called villi which penetrate the uterine wall absorbing food materials and oxygen to transport to the embryo. 
As the embryo develops, it becomes larger than the yolk and begins to fold over it.  Some of the yolk sac will continue developing in the embryo as parts of the gastrointestinal tract. 

Picture
How the yolk sac becomes part of the gastro intestinal tract
Picture



Function
The yolk sac provides nourishment and acts as a circulatory system for your embryo until the placenta develops and takes over these functions.  It contributes to the development of your baby's gastrointestinal and reproductive systems.

By the time of birth, the yolk sac has usually disappeared or it may be visible as a small oval between 1-6mm between the amnion and chorion (membranes) on the placenta - see below.

Picture
Remnants of a yolk sac in a full term placenta (C) Elemental Beginnings
Learn more about the umbilical cord, true knots and false knots

Author

Kelly Harper is a self-confessed "placenta nerd".  She loves learning about all things pregnancy, birth and baby related and delights in sharing that information with her doula and encapsulation clients.

0 Comments



Leave a Reply.

    free​bies

    Prepare for an easier fourth trimester with these 25 Secrets From A Postnatal Doula!
    Download Now

    blogs

    All
    Adelaide Birth Directory
    Aromatherapy
    Bereavement
    Birth
    Freebies
    Milksharing
    My Fourth Trimester Project
    Newsletter
    Placenta Encapsulation
    Postnatal Support
    Pregnancy
    Recipes
    Testimonials
    Workshops

    About Me

    Kelly Harper is the owner of Elemental Beginnings Doula & Placenta Services in Adelaide.  She provides sleep consultancy, placenta encapsulation and doula services to families during pregnancy, birth and in their fourth trimester.

    Kelly Harper is a doula working with families around Adelaide to achieve a positive birth
Privacy Policy
Disclaimer
Cancellation Policy
Contact Kelly

© 2020 Elemental Beginnings

PREGNANCY, BIRTH & POSTNATAL SUPPORT DELIVERED WITH  ❤  THROUGHOUT ADELAIDE & SURROUNDS

Photos used under Creative Commons from Peabody Awards, ivelissephotography, Exile on Ontario St, Faye✩ Mous
  • Home
  • Meet Your Doula
  • My Services
    • Online Doula Services >
      • Birth Plan Review
    • Pregnancy & Birth Coaching
    • Birth Doula
    • Postnatal Doula
    • Placenta Capsules
    • Bereavement Support
    • Umbilical Cord Ties
    • Adelaide Birth Directory
    • Gift Certificates
  • Resources
  • Kind Words
  • Contact Me