The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

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Answer 1

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Chapter 12.4, Problem 17BYGO

Summary Introduction

Introduction:

The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

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Discuss the concept of myelination and the purpose of the myelin sheath

Explain how myelin helps speed up the conduction speed of action potentials along theaxon of the neuron.

Explain why myelinated axons can propagate (spread) action potentials faster than unmyelinated axons.

Answer 2

Question

Chapter 12.4, Problem 17BYGO

Summary Introduction

Introduction:

The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

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Answer 3

Question

Chapter 12.4, Problem 17BYGO

Summary Introduction

Introduction:

The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

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Answer 4

Question

Chapter 12.4, Problem 17BYGO

Summary Introduction

Introduction:

The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

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Answer 5

Chapter 12.4, Problem 17BYGO

Summary Introduction

Introduction:

The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

Answer 6

Chapter 12.4, Problem 17BYGO

Summary Introduction

Introduction:

The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

Answer 7

Chapter 12.4, Problem 17BYGO

Summary Introduction

Introduction:

The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. The formation of myelin is called myelination or myelinogenesis. Schwann cells spiral a single nerve fiber repeatedly forming hundreds of compact layers without cytoplasm between the plasma membrane. These layers form the myelin sheath. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.

Answer 8

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Answer 11

Ch. 12.1 - What is a receptor? Give two examples of...Ch. 12.1 - Distinguish between the central and peripheral...Ch. 12.1 - Prob. 3BYGO Ch. 12.1 - What the nervous and endocrine systems have in...Ch. 12.1 - Three fundamental functions of the nervous system;...Ch. 12.1 - Differences between the central nervous system...Ch. 12.1 - The autonomic nervous system and its two divisions Ch. 12.2 - Sketch a multipolar neuron and label its...Ch. 12.2 - Explain the differences between a sensory neuron,...Ch. 12.2 - Prob. 6BYGO

Solution Summary: The author explains that the nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS.

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