Gastrulation Basics
This structure marks the beginning of gastrulation.
What is the primitive streak?
The primitive streak is located along this part of the embryo.
What is the midline?
Cells move inward through these two structures.
What are the primitive pit and groove?
This germ layer forms the internal lining of organs.
What is endoderm?
Germ layers give rise to these.
What are organ systems?
Gastrulation occurs in this layer of the embryo.
What is the epiblast?
This structure is the expanded cranial end of the primitive streak.
What is the primitive node?
Cell migration during gastrulation is essential for forming these.
What are internal structures/germ layers?
This germ layer forms outer structures.
What is ectoderm?
Errors in gastrulation can lead to this general outcome.
What are congenital abnormalities?
This is the main outcome of gastrulation.
What are the three germ layers?
This depression is found within the primitive node.
What is the primitive pit?
The first migrating cells replace this layer.
What is the hypoblast?
This germ layer forms between ectoderm and endoderm.
What is mesoderm?
The endoderm primarily forms this type of structures.
What are internal organ linings?
Gastrulation establishes these key orientations of the body.
What are body axes (cranial-caudal (anterior-posterior), dorsal-ventral (back-belly), left-right (medial-lateral))?
This groove extends caudally from the node.
What is the primitive groove?
These cells migrate between epiblast and endoderm.
What is mesoderm?
All three germ layers are established during this process.
What is gastrulation?
Mesoderm contributes to this general body system category.
What is cardiac and connective tissue system?
This region of the embryo is where gastrulation begins.
What is the caudal end?
These structures serve as entry points for migrating cells.
What are the primitive pit and groove?
Direction of migration includes these two orientations.
What are cranial and lateral directions?
This original layer gives rise to all three germ layers.
What is the epiblast?
Failure of proper cell migration could disrupt formation of these layers.
What are germ layers?