Chapter 6
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Created by:
speedfreak9999 on October 18, 2009
Subjects:
Biological Foundations of Behaviour
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22 terms
Terms | Definitions |
|---|---|
 Neural Plate | Is a thickened region of the ectodermal layer that gives rise to the neural tube |
| Neural Tube | A structure in the early stage of brain development from which the brain and spinal cord develop |
| Neural Stem Cell | Is a self-renewing, multipotential cell that gives rise to any of the different types of neuron and glia in the nervous system |
| Ventricular Zone | The lining of neural stem cells surrounding the ventricles in adults |
| Progenitor cell | Is the precursor cell derived from a stem cell and it migraes and produces a neuron or a glial cell |
| Neuroblast | A product of a progenitor cell that gives rise to any of the different types of neurons |
| Glioblast | A product of a progenitor cell that gives rise to different types of glial cells |
| Neurotropic Factor | Is a chemical compound that acts to support growth and differentiation in the dev eloping neurons and may act to keep certain neurons alive in adulthood |
| Radial Glial Cell | Is a path-making cell that a migating neuron follows to its appropriate destination |
| Growth Cone | Is the growing tip of an axon |
| Filopod | A process at the end of a developing axon that reaches out to search for a potential target or to sample th intercellular environment |
| Cell-Adhesion Molecule (CAM) | Ia a chemical to which specific cells can aadhere, thus aiding in migation |
| Tropic Molecule | A signaling molcule that attracts or repels growth cones |
| Netrins | Is the only class of tropic molecules yet isolated |
| Neural Darwinism | A hypothesis at the processes of cell death and synptic pruning are, like natural selection in species, the out come of competition among neurons for connections and metabolic resourses in a natural environment |
| Apoptosis | A cell death that is genetically programmed |
| Chemoaffinity Hypothesis | A proposal that neurons or teir axons and dendrites are drown toward a signaling chemical that indicates the correct pathway |
| Amblyopia | Is a condition in which vision in one eye is reduced as a result of the two eyes to point in the same direction |
| Critical Period | A developmental window during which some event has a long-lasting influence on the brain and is often refered to as a sensitve period |
| Imprinting | A process that predisposes an animal to form an attachment to objects or animals at a critical period in development |
| Masculinization | A process by which exposure to androgens ( male hormones) alters the brain, rendering it male-like |
| Anencephaly | Is a failure of the forebrain to devlope |
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