Ephrins ligands- Juxtacrine factors, binding between an ephrin on one cell and the eph receptor on an adjacent cell results in signals sent to each of the two cells
contact inhibition-the mechanism for directional cell movement wherein cells are prohibited from moving backwards due to interactions with the cell membrane of the other migrating cells.
dermal bone- bones that forms in the dermis of the skin such as most of the bones of the skull and face.
cranial Placodes-epidermal thickenings that form neurons and sensory epithelia.
Enamel knot-the signaling center for tooth development, a group of cells induced in the equithelium by the neural crest-derived mesenchyme that secretes paracrine factors that pattern the cusp of the tooth
Pathway secretion- axons travel along a route that leads them to a particular region of the embryo.
Target secretion- axons, once they reach the correct area, recognize and bind to a set of cells with which they may form stable connections
Address secretion- initial patterns are refined such that each axon binds to a small subset of its possible targets.
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