PSYC 370 Study Guide - Final Guide: Meningitis, Amygdala, Synaptogenesis
Document Summary
Growth cone: amoebalike structure at the tip of each growing axon or dendrite that guides growth of axon/dendrite to the appropriate target: pioneer growth cones: the first growth cones to travel along a particular route in the developing nervous system (cid:224) lay out path that later growth cones follow ( fasciculation") Chemoaffinity hypothesis: hypothesis that growing axons are attracted to the correct targets by different chemicals released by the target sites: revised hypothesis chemical released by the target, but rather influenced by series of chemical signals along the route. Topographic gradient hypothesis: hypothesis that axonal growth is guided by the relative position of the cell bodies on intersecting gradients, rather than by point to point coding of neural connections: growing axons are guided to their destinations by 2 signal gradients an anterior posterior gradient & a medial lateral gradient (p. 225 227, sperry"s frog experiment (cid:224) rotated eyes.
