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part of brain between cerebrum and spinal cord

longitudinal fissure

separate cerebral hemispheres


in-between the cerebral hemispheres and the brain stem

Law of Dynamic Polarization

idea proposed by Cajal in 1891 that neurons had a functional and morphological polarization
-Amazing given that synapses wouldn't be shown until 1953, 1954 and differences in organelle distribution would be even later than that
-Concept started the path of tracing connections between cells

Dendrites (and spines)

collect information, receive information from other neurons

cell body

integrate information
contains nucleus
supports metabolic syntheses of the cell
found in the gray matter


conduct information

axon terminal

transmit information
located in gray matter
heavily packed with vesicles, which contain neurotransmitter

dendritic spines

small protuberance for synaptic contacts, morphological substrate of learning


regions of gray matter where cell bodies are functionally related

white matter

areas of the CNS dominated by axons
appears white because axon myelin sheath, primarily lipid, appears white

gray matter

areas of the CNS dominated by cell bodies and dendrites


a collection of axons traveling from one region to another


mylinate axons
mostly in white matter, but also grey matter


support system:elaborate cytoskeletal network
monitor: regulate extracellular environment

ependymal cells

line the ventricles
produce CSF


garbage clean up
regulate extracellular enviroment

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