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March 25, 2013
Transmission electron microscope image of a thin section cut through a Strongylocentrotus drobachiensus [sea urchin] embryo at the gastrula stage. The image of the epithelial cell shows part of a cilium , microtubules and golgi. In the cell apex are the basal bodes that are the anchoring sites for the ciliary axonemes. Basal bodies originate from and have a substructure similar to that of centrioles, with nine peripheral microtubule triplets. The two inner microtubules of each triplet in a basal body become the two outer doublets in the cilium. As the axoneme is forming, striated filamentous rootlets(see structure just to the right of the basal body) extend into the cytoplasm to anchor the cilium. Class Echinoidea Superorder Echinacea Order Echinoida Strongylocentrotus drobachiensus JEOL 100CX TEM Credit: Louisa Howard, Evelyn Spiegel

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