Directional Terms Assignment 3

Science
Tutor: None Selected Time limit: 1 Day

Write two sentences demonstrating your knowledge of the terms proximal and distal utilizing the terms found in your book on specific body regions and body cavities.  Make sure you utilize different body regions and cavities for each sentence

Oct 8th, 2014

If the axon of a peripheral nerve is separated from the cell body, the distal portion deteriorates and the fragments are removed by macrophages. The proximal end then develops new sprouts, and nerve growth factors from surrounding neuroglia cause the sprouts to grow. At the same time, remaining Schwann cells proliferate and surround the new axon. If a sprout grows into the remaining basement membranes of the original tract, the new fiber may rejoin with its original connection. If the injured axon is from a neuron in the CNS, the lack of a myelin sheath prevents the new fiber from being guided to its original connection. Therefore, regeneration in the CNS is very unlikely. An injury to the cell body of a neuron usually causes death to the entire fiber, and no regeneration will occur.


Oct 8th, 2014

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Oct 8th, 2014
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Oct 8th, 2014
Dec 10th, 2016
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