study guide #3.docx - Study Guide for Exam#3 CHAPTER 6 What...

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Study Guide for Exam #3 CHAPTER 6 What is the wanting-linking theory of drug addition (i.e., tolerance and sensitization)? Due to tolerance/ habituation of one transmitter system Addicts can really “want the drug even though they don’t “like” the drug What changes at the synapse occur during sensitization of dopamine neurons? Larger synapse Enhancing function CHAPTER 8 What are the prenatal stages of brain development? Zygote: fertilization – 2 weeks Embryo: 2 weeks – 8 weeks Fetus: 9 weeks- birth Where are brain cells generated early in the first two weeks of development? Neural tube or disk What are progenitor cells and blasts? Maintains a constant supply of stem cells Progenitors can form a neuroblasts What are radial glial cells and what role do they have in brain development? When neurons migrate to their final destination via radial glial cells Provide path for cells Extend neural tube to cortex
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How are cortical layers formed in development? Layer six formed first Formed inside out What are the stages of brain maturation? 1: dendrites: slow 2: axons: fast 3: synapse What is a growth cone? At the end of axons Felo potia = thin feet Which develops first: dendrites vs. axons? Dendrites develop first What role do tropic molecules and cell adhesion molecules have in brain development? Tropic: tells growth cones to “come here” sought by axon Adhesion: serve to attract or reject growth cones What is synaptogenesis? Process of synapse formation and connections between cells 24 months is the most complex till ever be What is apoptosis?
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