LIFESCI 3B03 Lecture Notes - Lecture 2: Medium Spiny Neuron, Multipolar Neuron, Striatum
18 Jan 2017
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Document Summary
What do afferent and efferent mean: afferent blood flow towards the brain, efferent blood flow away from the brain. Neurite- used to describe ay projection coming out of the soma. Multipolar neuron- no dependent on axon or dendrites- but the number of projections from the soma as a whole. The shape of the neuron is often related to its function. Unipolar (very typical of invertebrates) - sensory neuron dorsal root ganglia. Multipolar- most common- interneurons, motor neurons, projection neurons. Projection neurons- have long axons and connect different levels of the spinal cord or the brain with the spinal cord. Sodium and potassium ionic conductance- sodium action potential comes first- depolarization of cell opens sodium channels- different cells have different thresholds. After opening of the sodium gates, it is followed by opening of voltage gated potassium gates. Myelinated axons allow for fast , salutatory.
