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Questions and Answers
What is the structure of the neurolemma?
What is the structure of the neurolemma?
Schwann cells are found in the central nervous system (CNS).
Schwann cells are found in the central nervous system (CNS).
False
What are the points of interruption on axons called?
What are the points of interruption on axons called?
nodes of Ranvier
What does the innermost wrappings of a Schwann cell form?
What does the innermost wrappings of a Schwann cell form?
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What is indicated by arrows in the cross-section of a peripheral nerve?
What is indicated by arrows in the cross-section of a peripheral nerve?
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The myelin sheath breaks at the ______.
The myelin sheath breaks at the ______.
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What do oligodendrocytes form on neurons in the CNS?
What do oligodendrocytes form on neurons in the CNS?
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Study Notes
Neurolemma Overview
- The neurolemma is a specialized membrane surrounding axons, resembling a "jelly-roll" structure formed by Schwann cells.
- Myelin sheaths are sandwiched between the layers of Schwann cells, providing insulation to the axons.
- Nodes of Ranvier are regular interruptions where the myelin sheath is absent, facilitating rapid nerve signal transmission.
Schwann Cells and their Function
- Schwann cells form the neurolemma and insulate peripheral nervous system neurons with their myelin sheath.
- Each Schwann cell wraps around an axon multiple times, with the innermost layers creating the myelin sheath.
- Oligodendrocytes serve a similar function in the central nervous system, forming myelin sheaths around neurons.
Peripheral Nerve Structure
- A cross-section of peripheral nerves reveals the cut ends of multiple neurons, showcasing the outer layer of Schwann cells.
- The appearance of darker Schwann cells indicates their role in peripheral nerve structure and function.
Nodes of Ranvier
- Nodes of Ranvier are specific locations where the myelin sheath is absent, marked by the presence of Schwann cells in close contact.
- These nodes are critical for the conduction of nerve impulses, allowing for faster transmission across the axon.
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Description
Test your knowledge on neurolemma and its role in axon structure with these flashcards. Understand the function of Schwann cells, myelin sheaths, and the importance of nodes of Ranvier. Perfect for students studying neurobiology or related fields.
