Pseudounipolar cells

From Wikipedia, the free encyclopedia

Pseudounipolar cells (Pseudo- false, uni- one) are sensory neurons in the peripheral nervous system. These neurons contain a long dendrite and a small axon that connects to the spinal cord.

The dendrite of these neurons are located in the nerves coming from the body. The cell bodies are located in the dorsal root ganglion just next to the spinal cord. The axons protrude through the dorsal root and into the posterior horn of the spinal cord.

The signal is conducted through the nerve (dendrite) to the dorsal root ganglion (cell body), then through the dorsal root (axon) ending at the sensory nuclei in the posterior horn of the spinal cord.

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Histology: nervous tissue
Neurons (gray matter): soma, axon (axon hillock, axoplasm, axolemma, neurofibril/neurofilament), dendrite (Nissl body, dendritic spine)
types (bipolar, pseudounipolar, multipolar, pyramidal, Purkinje, granule)

Afferent nerve/Sensory nerve/Sensory neuron (GSA, GVA, SSA, SVA, Type Ia sensory fiber), Efferent nerve/Motor nerve/Motor neuron (GSE, GVE, SVE) Alpha motor neuron, Gamma motoneurons, Upper motor neuron, Lower motor neuron), Interneuron (Renshaw)

Synapses: neuropil, synaptic vesicle, neuromuscular junction, electrical synapse

Sensory receptors: Free nerve ending, Meissner's corpuscle, Merkel nerve ending, Muscle spindle, Pacinian corpuscle, Ruffini ending, Olfactory receptor neuron, Photoreceptor cell, Hair cell, Taste bud

Glial cells: astrocyte, ependymal cells, microglia, radial glia

Myelination (white matter): Schwann cell, oligodendrocyte, nodes of Ranvier, internode, Schmidt-Lanterman incisures, neurolemma

Related connective tissues: epineurium, perineurium, endoneurium, nerve fascicle, meninges
Retrieved from "http://en.wikipedia.org../../../p/s/e/Pseudounipolar_cells.html"
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