Which of the following statement is correct for node of Ranvier of nerve
Which of the following statement is correct for node of Ranvier of nerve
- Neurilemma is discontinuous
- Myelin sheath is discontinuous
- Both neurilemma & Myelin sheath are discontinuous
- Covered by myelin sheath
The Correct Option is B
Solution and Explanation
The correct option is (B) : Myelin sheath is discontinuous
Because of the Ranvier nodes, the myelin sheath is disjointed. Nodes of Ranvier, a recurring opening in the myelin sheath that surrounds the axon of certain neurons, help nerve impulses to travel more quickly. A phenomenon called as saltatory conduction allows impulses to move from node to node because nodes of Ranvier periodically interrupt the insulation. The outermost nucleated cytoplasmic layer of Schwann cells, also known as neurolemmocytes, that encircles the neuron's axon is known as the neurolemma.
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Concepts Used:
Human Nervous System
The human nervous system is responsible for controlling and coordinating all the activities of the human body.
The three major functions of the human nervous system are:
- Gathering or assembling sensory information from the body and external environment.
- Processing and interpreting the sensory information acquired.
- Conveying or transferring appropriate response to the sensory information acquired.
The nervous system is mainly divided into two, namely:
The Central Nervous System (CNS) comprises the brain and spinal cord.
- The brain is majorly involved in the perception and processing of sensory input. It also regulates or manages voluntary motor responses and homeostatic mechanisms.
- The spinal cord act as a pathway for the transmission of information between the brain and the peripheral nervous system. It also takes action on reflex actions.
The Peripheral Nervous System (PNS) comprises sensory/motor neurons and ganglion.