Myelination and Myelin Sheath Formation

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What is the process by which the axon is enveloped in concentric layers of Schwann cell plasma membrane?

Myelination (correct)

Electrolysis

Osmosis

Neurotransmission

What is the term for the single axon enveloped by many layers of fused Schwann cell plasma membrane?

Mesaxon

Myelin Sheath (correct)

Node of Ranvier

Internode

What is the structure that forms as a result of the rotation of the mesaxon around the axon?

Node of Ranvier

Myelin Sheath (correct)

Schwann Cell

Axon

What is the term for the region of the axon that is not enveloped by the myelin sheath?

Node of Ranvier Signup and view all the answers

What is the term for the many layers of fused Schwann cell plasma membrane that envelop the axon?

Myelin Sheath Signup and view all the answers

What is the necessary condition for axons to regenerate?

The neuronal cell body is not damaged Signup and view all the answers

What is the primary constraint on axon regeneration?

The health of the neuronal cell body Signup and view all the answers

What is the term for the segment of myelin produced by each Schwann cell?

Internode Signup and view all the answers

What would prevent axon regeneration from occurring?

Neuronal cell body is damaged Signup and view all the answers

What is the function of the myelin sheath in the context of the axon?

To facilitate the transmission of signals along the axon Signup and view all the answers

What is the relationship between the neuronal cell body and axon regeneration?

The neuronal cell body is essential for axon regeneration Signup and view all the answers

What is the implication of axon regeneration being dependent on the neuronal cell body?

Axon regeneration is limited by cell body integrity Signup and view all the answers

What are the nodes of Ranvier?

Segments of the axon that are not covered by the myelin sheath Signup and view all the answers

What is the relationship between the internode and the nodes of Ranvier?

The internode is the gap between two nodes of Ranvier Signup and view all the answers

What is the role of the Schwann cells in the context of the axon?

To produce the myelin sheath that ensheathes the axon Signup and view all the answers

What is the primary target of injury in axonal neuropathies?

Axon Signup and view all the answers

Which type of neuropathy is most likely caused by direct axonal injury?

Axonal neuropathy Signup and view all the answers

What is a characteristic feature of axonal neuropathies?

Axonal degeneration Signup and view all the answers

In axonal neuropathies, which structure is most likely to be spared?

Myelin sheath Signup and view all the answers

What is the underlying mechanism of axonal neuropathies?

Direct axonal injury Signup and view all the answers

What is the primary symptom of the condition described?

Rapidly progressive weakness of limbs and respiratory muscles Signup and view all the answers

What is the most likely impact of the condition on the patient's daily life?

Impaired mobility and respiratory function Signup and view all the answers

Which of the following systems is most affected by the condition?

Nervous system Signup and view all the answers

What is the likely outcome if the condition is left untreated?

Progressive decline in muscle function and eventual respiratory failure Signup and view all the answers

Which of the following is a possible complication of the condition?

Respiratory failure Signup and view all the answers