Browser Not Supported.

IE users: please get the latest browser version at Microsoft Internet Explorer Home Page

if yot already have the latest browser version please verify that your browser settings is not in compatibility mode

Browser: unknown
Version: 0

EMBRYONIC DEVELOPMENT & STEM CELL COMPENDIUM
Content
All Anatomical Compartments > Compartment Card
Extraembryonic Mesoderm >

Extraembryonic Blood Islands


ExM.ExBI
Blood islands are cell aggregates in the early embryo, which first appear in the human yolk sac at approximately day 13-15 of gestation. Blood islands give rise to vascular endothelia and blood cells. The blood islands is comprised of a loose inner mass of embryonic hematopoietic precursor cells and an outer luminal layer of angioblasts.

The formation of blood islands in the yolk sac is a critical step in amniotic development.
Allantois
Extraembryonic Blood Islands
Multiple Ancestors Single Ancestor No Descendants Develops from Part of Parent