Pathology 3500 Chapter Notes - Chapter 1: Arachnoid Granulation, Choroid Plexus, Fourth Ventricle
28 Mar 2020
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Cerebral hemi: covered by cortex, divided by sulci into many gyri. Deep to the cortex is an expanse of white matter, formed by the fibers conducting impulses within the cns. One fluid-filled cavity (lateral ventricle) lies at the depth of each cerebral hemisphere. Csf in the subarachnoid space is reabsorbed into the blood stream across arachnoid granulations which penetrate into venous channels. Obstruction to the circulation of the csf, whether congenital or acquired, results in hydrocephalus (increased size of ventricles) Neurons: consist of a body (or soma), containing the nucleus and protein synthetic machinery and multiple processes (cytoplasmic extensions) Dendrites: collect impulses, the axon, conducts impulses away from the neuron. Electrical impulse conducted by the axon results inrelease of neurotransmitters synapse receiving neuron (post-synaptic) in turn develops (or is inhibited from developing) an electrical impulse in response to the release of neurotransmitter from the presynaptic terminal.
