Biology

Lumbar Plexus

Lumbar Plexus Definition Lumbar plexus is a group of four nerves (L1, L2, L3 and L4) that are located in front of the hip joint and follow the leg down to the thigh. Each of these nerves has specific branches and is associated with particular actions. Each of these labels (L1, L2, L3 and L4) [&he.....

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Peripheral Nervous System

Peripheral Nervous System Definition Peripheral nervous system (PNS) is the part of the nervous system in vertebrate animals that lies outside of the brain and spinal cord (central nervous system). It includes the nerves that extend to the limbs and many sense organs. It contains all the nerves i.....

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Myelin Protein Zero

Myelin Protein Zero Definition Myelin protein zero (PO, MPZ) is a glycoprotein which in humans is encoded by the MPZ gene. This gene is specifically expressed in Schwann cells of the peripheral nervous system and encodes a type I transmembrane glycoprotein that is a major structural protein of th.....

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Oligodendrocyte

Oligodendrocyte Definition Oligodendrocyte is any of the neuroglial cells of the central nervous system that are responsible for the formation of myelin sheaths in the white matter and that, in the gray matter, is detectable using myelin staining techniques and may provide support for adjacent ne.....

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Dendritic Spine

Dendritic Spine Definition Dendritic spines are a preferential site of synaptic axodendritic contact; they are sparse or absent in some types of nerve cells (motor neurons, the large cells of the globus pallidus, and stellate cells of the cerebral cortex), and exceedingly numerous in others such .....

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Purkinje Cell

Purkinje Cell Definition Purkinje cell is a large, densely branching neuron in the cerebellar cortex of the brain. These cells were first discovered in 1837 by Czech physiologist Jan Evangelista Purkinje. They are characterized by cell bodies that are flasklike in shape, by numerous branching den.....

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About Cerebellum

About Cerebellum Definition Cerebellum is the part of the vertebrate brain that is located below the cerebrum at the rear of the skull and that coordinates balance and muscle activity. In mammals, the cerebellum is made up of two connecting hemispheres that consist of a core of white matter surro.....

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Medulla Oblongata

Medulla Oblongata Definition Medulla oblongata is the lowermost portion of the brainstem in humans and other mammals. It is important in the reflex control of involuntary processes, including respiration, heartbeat, and blood pressure. It is a cone-shaped neuronal mass responsible for autonomic (.....

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Eosinophil

Eosinophil Definition Eosinophil is a type of white blood cell containing cytoplasmic granules that are easily stained by eosin or other acid dyes. It is also called eosinophilic leukocyte, oxyphil, oxyphilic leukocyte. Eosinophils are produced in the bone marrow and migrate to tissues throughout.....

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Progenitor Cell

Progenitor Cell Definition Progenitor cell is a cell that originates from a stem cell and differentiates into a more specialized cell. A progenitor cell is often more limited than a stem cell in the kinds of cells it can become. The most important difference between stem cells and progenitor cell.....

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Neurotrophin

Neurotrophin Definition Neurotrophins (neurotrophic factors) are proteins which induce the survival of neurons and are found in the blood stream. Neurotrophins are capable of signaling particular cells to survive, differentiate, or grow. Neurotrophins are secreted by target tissues and prevent ne.....

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Schwann cell

Schwann cell Definition Schwann cell is any of the cells that cover the axons in the peripheral nervous system and form the myelin sheath. It is also called neurilemma cell. Schwann cells are named after German physiologist Theodor Schwann, who discovered them in the 19th century. These cells are.....

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