PSYB20H3 Lecture Notes - Frontal Lobe, Temporal Lobe, Breastfeeding

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Neurons: basic structures of the nervous system that transmit and receive chemical and electrical impulses across synapses. Synapse: space where the axon of one neuron meets the dendrites of the other: most of the neurons that a person will ever have are formed by the end of the second trimester (6th month). Glial cells: nerve cells that are more numerous than neurons and continue to replicate throughout life. They nourish cells, facilitate transport, and manage waste removal: oligodendrocytes: encase the axon of neurons in myelin. They process by which this occurs is called myelination: myelin sheath: waxy substance wrapped around neuron, acting as an insulator to increase speed of neural impulse transmission, allowing more efficient communication between brain and body. Some areas are not completely myelinated even into adulthood (including frontal cortex) Brain growth spurt: begins during 7th month of pregnancy and continues until 2 years.

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