What is the histology of nervous tissue?

What is the histology of nervous tissue?

Nerve tissue consists of 2 principal types of cells: neurons and supporting cells. The neuron is the structural and functional/electrically excitable unit of the nervous system. It is divided according to its anatomical components as well as its functional characteristics.

What are the Myelinates of the CNS?

Myelin sheaths of axons are produced by oligodendrocytes, specialized glial cells derived from the neuroepithelium, in the CNS and by Schwann cells, derived from neural crest, in the peripheral nervous system (PNS).

What are the 3 types of nervous tissue?

Nervous tissue is composed of neurons, also 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.

What is a nerve histology?

Histological inspection reveals that each nerve fibre is actually composed of a large number of axons whose cell bodies reside in central or peripheral ganglia, the spinal cord or the brain. The primary purpose of this article is to evaluate the histology of peripheral nervous tissue.

What are the morphological types of neurons?

Neurons can be morphologically characterized as unipolar, bipolar, or multipolar. Unipolar and pseudounipolar cells have only one process extending from the cell body.

Which glial cell Myelinates and insulates axons in the peripheral nervous system?

Schwann cells myelinate axons in the peripheral nervous system (PNS), and can only be associated with one neuron per cell.

What are Ranvier’s nodes?

Nodes of Ranvier. These are the gaps formed between the myelin sheath where the axons are left uncovered. Because the myelin sheath is largely composed of an insulating fatty substance, the nodes of Ranvier allow the generation of a fast electrical impulse along the axon.

What are the histological features of a neuron?

Neuron histology

Categories Nuclei or laminae (CNS) or ganglia (PNS)
Structure Cell body (soma), dendrites (covered with dendritic spines), axon, axon hillock. Nissl bodies
Types Myelinated (nodes of Ranvier) vs nonmyelinated Multipolar, bipolar, pseudounipolar

What are 2 types of cells in nervous tissue?

Although the nervous system is very complex, there are only two main types of cells in nerve tissue. The actual nerve cell is the neuron. It is the “conducting” cell that transmits impulses and the structural unit of the nervous system. The other type of cell is neuroglia, or glial, cell.

What are the 4 types of nervous system?

The central nervous system is made up of the brain and spinal cord, and the peripheral nervous system is made up of the Somatic and the Autonomic nervous systems….Autonomic Nervous System

  • The sympathetic nervous system.
  • The parasympathetic nervous system.
  • The enteric nervous system.