What is posterior dominance?
Posterior Dominance in the context of somites refers to the tendency for the more posterior (tailward) somites to influence the development of anterior (headward) somites during embryogenesis. This phenomenon plays a crucial role in establishing the body plan of vertebrates.
What are the main features of posterior dominance?
- Somite Progression: Somites are blocks of mesoderm that form sequentially from head to tail along the embryonic axis.
- Influencing Development: Posterior somites can influence the fate and differentiation of anterior somites, leading to the formation of distinct structures in different body regions.
- Gradients: This influence often involves the establishment of gradients of signaling molecules that are produced by posterior somites and act on anterior somites.
What is the importance of posterior dominance?
- Body Plan Establishment: Posterior dominance is essential for establishing the proper body plan, ensuring that different body segments develop in the correct order and with the appropriate structures.
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