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BOX 2.2 CAJAL: ICONOCLAST TO ICON Santiago Ramón y Cajal
BOX 2.2 CAJAL: ICONOCLAST TO ICON Santiago Ramón y Cajal

... who, based on the use of his silver chromate method, concluded that axons of nerve cells form a continuous reticular net, whereas in contrast dendrites do not anastomose but instead serve a nutritive role, much like the roots of a tree. Using the same technique, Cajal almost immediately arrived at t ...
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... vessels, fatty tissue help nourish and protect nerve fibers • neurons rarely reproduce • Schwann cells: peripheral nerves only; produce layers of myelin sheathing around axons; myelinated axons transmit nerve impulses much faster than non-covered ...
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... prescribed twice daily for 1 month. On recall visit it was observed that patient was asymptomatic. DISCUSSION Neurapraxia results in temporary damage to the myelin sheath but leaves the nerve intact and is an impermanent condition; thus, Wallerian degeneration does not occur in neurapraxia. In order ...
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Supporting Cells of the Nervous System

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... thoughts and personality • Large memory storehouse. • Each portion of the nervous system performs specific functions, but it is the cortex that opens the world up for one’s ...
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Neuroregeneration

Neuroregeneration refers to the regrowth or repair of nervous tissues, cells or cell products. Such mechanisms may include generation of new neurons, glia, axons, myelin, or synapses. Neuroregeneration differs between the peripheral nervous system (PNS) and the central nervous system (CNS) by the functional mechanisms and especially the extent and speed. When an axon is damaged, the distal segment undergoes Wallerian degeneration, losing its myelin sheath. The proximal segment can either die by apoptosis or undergo the chromatolytic reaction, which is an attempt at repair. In the CNS, synaptic stripping occurs as glial foot processes invade the dead synapse.Nervous system injuries affect over 90,000 people every year. It is estimated that spinal cord injuries alone affect 10,000 each year. As a result of this high incidence of neurological injuries, nerve regeneration and repair, a subfield of neural tissue engineering, is becoming a rapidly growing field dedicated to the discovery of new ways to recover nerve functionality after injury. The nervous system is divided into two parts: the central nervous system, which consists of the brain and spinal cord, and the peripheral nervous system, which consists of cranial and spinal nerves along with their associated ganglia. While the peripheral nervous system has an intrinsic ability for repair and regeneration, the central nervous system is, for the most part, incapable of self-repair and regeneration. There is currently no treatment for recovering human nerve function after injury to the central nervous system. In addition, multiple attempts at nerve re-growth across the PNS-CNS transition have not been successful. There is simply not enough knowledge about regeneration in the central nervous system. In addition, although the peripheral nervous system has the capability for regeneration, much research still needs to be done to optimize the environment for maximum regrowth potential. Neuroregeneration is important clinically, as it is part of the pathogenesis of many diseases, including multiple sclerosis.
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