Histology Guide

virtual microscopy laboratory

Chapter 6 - Nerve Tissue

The nervous system is specialized for communication of information from one region of the body to another.

Neuron

The neuron is the structural and functional unit of the nervous system. Nerve cells are specialized to receive input from other cells and then convey this information to other cells.

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Nerve Cell/Synapses
TEM

A synapse is a junction between two neurons in which impulses pass by diffusion of an extracellular neurotransmitter.

Glial Cell

Glial cells (or neuroglia) provide support and protection to neurons. Four types of cells are found in the central nervous system:

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Oligodendrocyte/Astrocyte
TEM

A variety of glial cells are associated with the peripheral nervous system.

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Schwann Cell
TEM
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Satellite Cell
TEM

Peripheral Nerve

Peripheral nerves contain the axons of both motor neurons and sensory neurons that connect with the spinal cord. They are surrounded by multiple layers of connective tissue.

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Non-myelinated Nerve Fibers
TEM
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Non-myelinated Nerve Fibers
TEM
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Non-myelinated Nerve Fibers
TEM

Myelinated axons are a portion of a neuron that is encapsulated by a fatty layer called the myelin sheath. The speed of conduction of myelinated axons is faster than non-myelinated axons.

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Myelinated Nerve Fibers
SEM
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Myelinated and Non-myelinated Nerve Fibers
TEM

Neuromuscular Junction

A neuromuscular junction (or motor endplate) is a specialized synapse between a motor neuron and a skeletal muscle cell. It transmits a signal to the muscle fiber causing its contraction.