The cell body of a nerve cell (also called the perikaryon or. Sensory neurons with cell bodies in the dorsal root ganglia of the vertebrate spinal cord are pseudo-unipolar: one branch projects to the periphery (to sensory receptors in the skin, joints, and muscle), the other to the spinal cord. Every nerve cell has three distinctive portions - a cell body, one axon, and several dendrites. Pseudo-unipolar neurons initially develop as bipolar cells, but at some point the two processes that extend from the cell body fuse to form a single neurite. Some vertebrate sensory neurons are classified as pseudo-unipolar. Examples of bipolar neurons include most invertebrate sensory neurons and bipolar cells of the vertebrate retina. Which is the main receptive portion of the neuron a) the axon b) the cell body or. Some neurons in the vertebrate brain have a unipolar morphology: a notable example is the unipolar brush cell, found in the cerebellum and granule region of the dorsal cochlear nucleus.Ī third morphological class, bipolar neurons, extend just one axon and dendritic process from the cell body. Unipolar neurons makeup the sensory neurons in the peripheral nervous system. In multipolar neurons, multiple processes extend from the cell body including dendrites and axons. These cells have the potential to generate most, if not all, of the different types of neurons and glia found in the brain. Neurons are born in areas of the brain that are rich in concentrations of neural precursor cells (also called neural stem cells). Most neurons in the central nervous systems of vertebrates, including mammals, are multipolar. Bipolar neurons have an axon and one dendrite extending from the cell body toward opposite poles. The cell bodies of invertebrate unipolar neurons are often located around the edges of the neuropil, in the so-called cell-body rind. Most neurons in the central nervous systems of invertebrates, including insects, are unipolar. The neurite then branches to form dendritic and axonal processes. A unipolar neuron is a neuron in which only one process, called a neurite, extends from the cell body.
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