Embryonic mesoderm

Definition

Embryonic mesoderm is one of the three primary germ layers formed during early embryonic development. It gives rise to various tissues and organs including muscles, bones, and the circulatory system.

5 Must Know Facts For Your Next Test

1. The mesoderm forms between the ectoderm and endoderm layers during gastrulation.
2. In Deuterostomia, the mesoderm often originates from pouches pinched off from the archenteron.
3. It differentiates into structures such as notochord, somites, and coelomic cavities in deuterostomes.
4. Mesodermal cells contribute to the development of the skeletal, muscular, and excretory systems.
5. Abnormalities in mesodermal development can lead to congenital conditions affecting multiple organ systems.

Review Questions

• What major tissues and organs does the embryonic mesoderm give rise to?
• How does mesoderm formation differ in Deuterostomia compared to other superphyla?
• What are some key structures that originate from the mesoderm in deuterostomes?

Related terms

Ectoderm: The outermost germ layer that develops into skin and nervous tissue.

Endoderm: The innermost germ layer that forms the lining of digestive and respiratory systems.

Gastrulation:

A phase early in embryonic development during which the three primary germ layers are formed.