PSB-2000 Chapter Notes - Chapter 3: Cranial Nerves, Temporal Lobe, Bipolar Neuron
Document Summary
Psb 2000 chapter 3: anatomy of the nervous system. 3. 1 : general layout of the nervous system. Blood-brain barrier: in the brain blood vessels walls are tightly packed forming barrier so that many bad molecules can"t pass through. Neurons: cells that are specialized for the reception, conduction, and transmission of electrochemical signal. External anatomy of neuron: cell body, dendrites, axon hillock, axon, myelin, nodes of ranvier, synapses, synaptic buttons. Neuron cell membrane: phospholipid bilayer with proteins embedded. Interneuron: neurons with a short axon or no axon at all. In the cns, there are nuclei: clusters of cell bodies. (cns) tracts: bundles of axons. In the pns, it is called ganglia. (pns) nerves: bundles of axons. Glial cells: thought to just support neurons, but now found to do much more: oligodendrocytes: wrap around the axons of some neurons in the cns. Help form myelin sheaths and do several at one time: schwann cells: do the same thing in the pns.
