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# Cells of the Nervous System **Microglia:** Macrophage that consumes dead cells. **Oligodendroglia:** Forms myelin sheath, the protective layer around neurons in the central nervous system (CNS). **Schwann cells:** Same function as oligodendroglia, but in the peripheral nervous system (PNS). **...

# Cells of the Nervous System **Microglia:** Macrophage that consumes dead cells. **Oligodendroglia:** Forms myelin sheath, the protective layer around neurons in the central nervous system (CNS). **Schwann cells:** Same function as oligodendroglia, but in the peripheral nervous system (PNS). **Astrocytes:** Support and nourish neurons. **Ependymal cells:** Line the spaces filled with cerebrospinal fluid (CSF) in the brain and spinal cord. ## Cerebrospinal Fluid (CSF) Functions * Protection from injuries or impacts. * Cushions the brain and spinal cord. * Provides nutrients (glucose, vitamins, and hormones) to the nervous system. * Maintains homeostasis (equilibrium) in the brain. * Provides buoyancy (flotation) to the brain. ## Neurons **Function:** Transmit impulses and information to other neurons. **Synapse:** The point of contact where one neuron connects to another. The function takes place at the synapse. **Synapse Types:** * **Chemical Synapse:** Transmission of signals through neurotransmitters. * **Electrical Synapse:** Transmission of signals directly through ion channels. Each type of synapse is dependent on its own stimuli. ### Chemical Synapse * **Neurotransmitters:** Chemical messengers that transmit signals across chemical synapses. * **Examples:** Acetylcholine (activates the CNS, involved in cognitive function and analysis), Catecholamines (norepinephrine -regulates mood, patterns of sleep, and the emotion of anxiety), Dopamine ( involved in motor control, motivation, and reward, has 5 types of subreceptors). ### Electrical Synapse * This synaptic type is dependent on electrical stimulus. **Note:** The image contains mentions of "D1, D2, D3, D4, D5" as types of dopamine sub-receptors, implying a broader context relating to specific receptors or functions in a larger system.