Characteristics of worried Tissue

Nervous organization is the main component of the worried system, which includes the brain, spinal cord, and also nerves.

You are watching: Covering of white fatty tissue that surrounds and insulates the axon of a nerve cell:


Key Takeaways

Key PointsNervous tissue is just one of four major classes of tissues and makes up the central nervous system and also the peripheral worried system.Integration and also communication are the two major functions of nervous tissue.Nervous tissue contains two category of cells — neurons and also neuroglia.Neurons space highly specialized nerve cells that generate and also conduct nerve impulses.Neuroglia room supporting cells that carry out physical sport, remove debris, and carry out electrical insulation.Key Termsmyelin: A substance developed by cell of the neuroglia that rises the speed of impulses follow me the axon of the neuronal fiber.nervous tissue: The principal constituent the the central and peripheral worried system, made up neurons and neuroglia cells.brain: The control facility of the main nervous system, located in the skull.

Nervous Tissue

Nervous tissue is just one of four major classes of tissues. The is specialized tissue discovered in the main nervous system and also the peripheral concerned system. It consists of neurons and supporting cells called neuroglia.

The nervous mechanism is responsible because that the manage of the body and also the communication amongst its parts. Worried tissue contains two categories of cells—neurons and neuroglia.

Neurons

Neurons space highly specialized nerve cells the generate and conduct nerve impulses. A common neuron consists of dendrites, the cell body, and also an axon.

Dendrites

Dendrites space responsible because that responding to stimuli; they receive incoming signals towards the cell body. The axons space responsible for transmitting impulses end long ranges from cabinet body. The cell human body is prefer a manufacturing facility for the neuron. The produces every the proteins and contains devoted organelles such together nucleus, granules and also Nissl bodies.


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Neuron: This image illustrates the components of a neuron. The dendrites obtain incoming signal while axons propagate signals far from the neuron cabinet body. The myelin sheath surrounds and also insulates the axon.


Dendrite

The axon is surrounding by a whitish, fatty layer dubbed the myelin sheath. Outside the myelin sheath there is a moving layer dubbed the neurilemma.

Schwann Cells

In the peripheral nervous system, Schwann cells are neuroglia cell that assistance neuronal duty by boosting the speed of impulse propagation. The Schwann cells are underlain by the medullary sheath. The medullary sheath is interrupted in ~ intervals by the nodes the Ranvier.


Illustration the the Schwann Cells and also the Myelin Sheath: infection electron micrograph that a myelinated axon. The myelin great (concentric) surrounding the axon of a neuron, reflecting Schwann cells.


Types of concerned Tissue

The concerned system is composed of nervous tissue, i beg your pardon is created of two principal species of cells dubbed neuron and neuroglia.


Learning Objectives

Describe the main cells that comprise nervous tissue


Key Takeaways

Key PointsNervous tissue is created of neurons and supporting cells dubbed neuroglia, or ” glial cells.”There space six varieties of neuroglia. Four are found in the main nervous system, while 2 are discovered in the peripheral concerned system.The four types of neuroglia found in the main nervous system are astrocytes, microglial cells, ependymal cells, and oligodendrocytes.The two species of neuroglia found in the peripheral nervous mechanism are satellite cells and Schwann cells.Neurons space the other the other form of cabinet that consist of nervous tissue. Neurons have actually cell bodies, dendrites, and also axons.Key Termsneuron: The key cell form in concerned tissue.neuroglia: supporting cells in worried tissue.

Nervous tissue, one of the four main organization types, is written of neurons and supporting cells referred to as neuroglia. Neuroglia are additionally called “glial cells.”

Neuroglia

There room six varieties of neuroglia—four in the main nervous system and also two in the PNS. This glial cells are connected in many devoted functions apart from support of the neurons. Neuroglia in the CNS include astrocytes, microglial cells, ependymal cells and oligodendrocytes. In the PNS, satellite cells and also Schwann cells space the 2 kinds that neuroglia.

Astrocytes

Astrocytes room shaped choose a star and also are the most abundant glial cabinet in the CNS. Castle have plenty of radiating processes which assist in clinging to the neurons and capillaries. They support and also brace the neurons and anchor them to the nutrient it is provided lines. Castle also aid in the guiding the migrate of young neurons. Astrocytes regulate the chemical environment around the neurons.

Microglial Cells

Microglial cells are little and ovoid un shape with thorny processes. Lock are found in the CNS. Once invading pathogen or dead neurons space present, the microglial cells deserve to transform into a phagocytic macrophage and aid in cleaning the neuronal debris.

Ependymal Cells

Ependymal cells are ciliated and line the central cavities the the brain and spinal cord wherein they type a fairly permeable barrier between the cerebrospinal fluid that fills this cavities and also the tissue cells that the CNS.

Oligodendrocytes

Oligodendrocytes line up follow me the nerves and produce an insulating cover referred to as myelin sheath. They are found in the CNS.

Satellite Cells

Satellite cells surround neuron cabinet bodies in the peripheral nervous mechanism (PNS). They space analogous come the astrocytes in the CNS.

Schwann Cells

Schwann cells surround all nerve fibers in the peripheral nervous mechanism and form myelin sheaths about the nerve fibers. They are uncovered in the PNS. Their duty is similar to oligodendrocytes.

Neurons

Neurons consist of cell body and one or an ext slender processes. The neuronal cell body consists of a nucleus and also rough endoplasmic reticulum or Nissl Bodies. The cell human body is the major biosynthetic center of a neuron and also contains the usual organelles because that the synthesis of proteins and other chemicals. Arm favor processes extend from the cell body to every neurons.

The two species of neuron procedures are called dendrites and also axons. Dendrites are motor neurons that are short and also have a huge surface area for receiving signal from various other neurons. Dendrites convey just arrived messages towards the cell body and are therefore called the receptive intake region.

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The axon occurs from the cone shaped section of the cabinet body referred to as the axon hillock. Functionally, the axon is the conducting region of the neuron and also is responsible for generating and also transmitting impulses typically away from the cabinet body. A single axon stclairdrake.net the nerve impulse from the cell human body to another neuron or one effector organ. The axon can have countless terminal branches, so every time the nerve fires, it have the right to stimulate much more than one cell.