Triploblasts

Definition

Triploblasts are animals whose embryos develop three primary germ layers: the ectoderm, mesoderm, and endoderm. These layers give rise to all the tissues and organs of the organism.

5 Must Know Facts For Your Next Test

1. Triploblasts have three germ layers: ectoderm, mesoderm, and endoderm.
2. They exhibit bilateral symmetry during at least one stage of their life cycle.
3. The mesoderm allows for the development of complex organs and systems such as muscles, circulatory systems, and internal structures.
4. Most higher animals including humans are triploblasts.
5. Triploblastic development is a key feature distinguishing more complex animals from simpler ones like diploblasts.

Review Questions

Related terms

Diploblasts: Animals with two primary germ layers (ectoderm and endoderm).

Gastrulation:

The process during embryonic development that forms the germ layers.

Bilateral Symmetry: A body plan where an organism can be divided into symmetrical halves on only one plane.