Textbook Notes (368,389)
Canada (161,858)
Psychology (9,695)
PSYC55H3 (6)
Andy Lee (6)
Chapter 3

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Andy Lee

Chapter 3 Neuroanatomy and Development Sylvian Fissurethe division that separated the temporal lobe from the frontal and parietal lobes Neuroanatomy Neuroanatomy the study of the nervous system Occurs at two levels1 Gross neuroanatomywhich focuses on general structures and connections visible to the naked eye2 Fine neuroantomymicroscopic neuroantomy describes the organization of neurons and their connections and sub cellular structure Dura materconsists of dense layers of colagenous fibers hard motherGryithe protruded rounded surfaces seen in the cortex of the CNS Sulci the smaller invaginationscreases in the CNS and fissuresthe larger invaginations Gray matter forms a continuous cortical sheath enshrouding a seemingly homogenous mass of white mattero Contains cell bodies of neurons and glial cells White matter appears white due to the fatter tissue called my lien sheaths surrounding the axons Tracts bundles of axonsMicroanatomy and Histology Cell Staining and Tract Tracing Histologyis the study of tissue structure through microscopic techniques o Used to identify patterns of connectivity in the nervous systemNeurons are not wired together in a simple serial circuit A single cortical neuron is likely to be innervatedreceive inputs from a large number of neurons Axons from these input neurons can originate in widely distributed regions There is a large amount of convergence and divergence in which a single neuron can receive inputs from many neurons and or project to multiple neuron targets Axons are short projections from neighboring cortical cellsbut some can be quite longo Descending below the cortical sheath into the white matter traveling through long fibre tracts and then entering another region of cortex subcortical nucleus or spinal layer to synapse on another neuron Neighbouring and distant connections between two cortical regions are referred to as Corticocortical connectionsStains chemicals of various sorts that are selectively absorbed by specific neural elementso Staining methods were discovered by trial and error
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