Question:

Myelin sheath is found in

Updated On: Aug 15, 2022
  • unipolar neuron,
  • bipolar neuron
  • non medullated neuron.
  • medullated nerve fibre
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The Correct Option is D

Solution and Explanation

Myelinated or medullated nerve fibres are covered by two sheaths, outer neurilemma and inner medullary sheath. The medullary sheath is made of white shining lipid rich substance called myelin. Myelin or medullary sheath is secreted by Schwarm cells in peripheral nerve fibres and oligodendrocytes in central nervous system. The areas of myelinated nerve fibres devoid of myelin sheath are called nodes of Ranvier. Area of nerve fibre . between two adjacent nodes of Ranvier is called internode. Myelinated nerve fibres occur in white matter of central nervous system and in most peripheral nerves.
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Concepts Used:

Neural Control and Coordination

Neural System:

Neurons are the most specialised cells in the nervous system of all animals, and they are responsible for detecting, accepting, and conveying numerous types of motives. The neurological system of low-spinal animals like Hydra is incredibly simple, consisting of a network of neurons. When the brain of an insect comprises a vast number of ganglia and neural tissues, it is optimally structured.

Coordination System:

Coordination is the process by which two or more organs work together to accomplish each other's duties. Increased muscle activity increases the supply of oxygen and the demand for energy while we exercise. When we cease exercising, our nerves, heart, lungs, and kidneys all return to normal. As a result, all of the organs' functions are properly integrated in order to conduct the exercise and supply the appropriate conditions while exercising. Similarly, in the human body, the neurological and endocrine systems work together to coordinate all of the organ activities.