![]() ![]() In addition, most spines exhibit a single, continuous postsynaptic density (PSD), but some PSDs are discontinuous or perforated. However, spine morphology is not static spines change size and shape over variable timescales. Spines have been classified by shape as thin, stubby, mushroom- and cup-shaped. So, spines represent the main unitary postsynaptic compartment for excitatory input. Most excitatory synapses in the mature mammalian brain occur on spines. Neuronal polarity: An evolutionary perspective.Dendritic spines are morphological specializations that protrude from the main shaft of dendrites. Brain basics: The life and death of a neuron.35.2: Neurons and glial cells - neurons.You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles. ![]() Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. Multipolar neurons occur throughout the CNS. Each neuron has one axon but multiple dendrites extending from the cell body. Multipolar neurons are the most complex and commonly occurring type of neuron within the human body. Their presence in humans is limited, but they play an important role within the ears, nose, and eyes. Unipolar neurons do not occur in humans.īipolar neurons have one axon and one dendrite extending from the cell body. The axon splits up into dendrites at the ends. Unipolar neurons are the simplest form, with one axon extending from the cell body. The arrangement of these components determines the type of neuron. These are the cell body, axons, and dendrites. Other forms, including pseudounipolar and anaxonic neurons, also exist. The three main types of neurons are unipolar, bipolar, and multipolar. Neurons are nerve cells that transfer information around the body, and some types form part of the CNS. However, they do have pseudounipolar neurons.
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