Nervous tissue is grouped into two main categories: Neurons, or nerves, transmit electrical impulses, while neuroglia do not; neuroglia have many other functions including supporting and protecting neurons. Function of Nervous Tissue Nervous tissue makes up the nervous system. The nervous system is subdivided in several overlapping ways.
Structure[ edit ] Nervous tissue is composed of neuronsalso called nerve cells, and neuroglial cells. Four types of neuroglia found in the CNS are astrocytes, microglial cells, ependymal cells and oligodendrocytes. Two types of neuroglia found in the PNS are satellite cells and Schwann cells.
In the central nervous system CNSthe tissue types found are grey What is nervous tissue and white matter. The tissue is categorized by its neuronal and neuroglial components.
Dendrites are thin, branching projections that receive electrochemical signaling neurotransmitters to create a change in voltage in the cell. Axons are long projections that carry the action potential away from the cell body toward the next neuron. The bulb-like end of the axon, called the axon terminalis separated from the dendrite of the following neuron by a small gap called a synaptic cleft.
When the action potential travels to the axon terminal, neurotransmitters are released across the synapse and bind to the post-synaptic receptorscontinuing the nerve impulse.
Relay an action potential out of the CNS to the proper effector muscles, glands Interneurons: Cells that form connections between neurons and whose processes are limited to a single local area in the brain or spinal cord Structural classification: Have 3 or more processes coming off the soma cell body.
They are the major neuron type in the CNS and include interneurons and motor neurons. Sensory neurons that have two processes coming off the soma, one dendrite and one axon Pseudounipolar neurons: Sensory neurons that have one process that splits into two branches, forming the axon and dendrite Unipolar brush cells: Are excitatory glutamatergic interneurons that have a single short dendrite terminating in a brush-like tuft of dendrioles.
These are found in the granular layer of the cerebellum. Neuroglia encompasses the non-neural cells in nervous tissue that provide various crucial supportive functions for neurons.
They are smaller than neurons, and vary in structure according to their function.
Microglia are macrophage cells that make up the primary immune system for the CNS. Star-shaped macroglial cells with many processes found in the CNS. They are the most abundant cell type in the brain, and are intrinsic to a healthy CNS.
CNS cells with very few processes. They form myelin sheaths on the axons of a neuron, which are lipid-based insulation that increases the speed at which the action potential, can travel down the axon. CNS cells that are distinct from astrocytes, oligodendrocytes, and microglia, and serve as the developmental precursors of oligodendrocytes  Schwann cells: Line the surface of neuron cell bodies in ganglia groups of nerve body cells bundled or connected together in the PNS  Enteric glia:Nervous tissue is composed of two types of cells, neurons and glial cells.
Neurons are the primary type of cell that most anyone associates with the nervous system. They are responsible for the computation and communication that the nervous system provides.
The nervous system is the part of an animal that coordinates its actions by transmitting signals to and from different parts of its body.
The nervous system detects environmental changes that impact the body, then works in tandem with the endocrine system to respond to such events.
Nervous tissue first arose in wormlike organisms about to million years ago.
Nervous Tissue Definition. Nervous tissue is the term for groups of organized cells in the nervous system, which is the organ system that controls the body’s movements, sends and carries signals to and from the different parts of the body, and has a role in controlling bodily functions such as digestion.
Nervous Tissue - Anatomy & Physiology Revision about the Structure and Functions of Human Tissue Types. Nervous tissue consists of two types of cells. They are called neurons and neuroglia, of which only neurons transmit nerve impulses.
Nervous tissue (also called neural tissue, or nerve tissue) is the main tissue component of the two parts of the nervous system; the brain and spinal cord of the central nervous system (CNS), and the branching peripheral nerves of the peripheral nervous system (PNS), .
Nervous tissue is found in the brain, spinal cord, and nerves. It is responsible for coordinating and controlling many body activities. It stimulates muscle contraction, creates an awareness of the environment, and plays a major role in emotions, memory, and reasoning.