NEUR 2200 Lecture Notes - Lecture 12: Retina, Mechanical Energy, Radiant Energy
28 Feb 2017
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Document Summary
Cells migrate to inner layers and then the outer layers. Uncommitted precursor cells have some differentiation more differentiation . Filopod: sample the environment looking for chemicals that the growth cones will respond to. Begin at about 20 weeks and continuous after birth and all throughout life. On the cell"s surface of intercellular space. Filopod will attach to these molecules and ether attract or repel growth cones. Example seen in the cerebellum: at 12 weeks prenatally very little branching, by an adult many synaptic connections (large tree). This always for development in motor control (actual number of weeks is not to be memorized) 5 and 6) cell death and synaptic rearrangement: The brain takes away extra pieces using cell death (genetic signal, experience, stress) Cortex becomes thinner (from back to front) Synaptic connections that are not used are pruned away. Neuronal darwinism: hypothesis that competition among neurons for resources causes cell death (survival of the fittest)
