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Nerve Tissue. Al- Maarefa College. Nerve Tissue. Cells have very high ability to Respond to stimuli Transmit impulses. Nerve Tissue. Nerve Tissue. NEURON is the main nerve cell). Nerve Tissue. NEURON is the main nerve cell Cell Body(3) Dendrites (5) Axon(1). Motor Neurone.

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Nerve tissue

Nerve Tissue

Al-Maarefa College


Nerve tissue1
Nerve Tissue

  • Cells have very high ability to

    • Respond to stimuli

    • Transmit impulses



Nerve tissue3
Nerve Tissue

  • NEURON is the main nerve cell)


Nerve tissue4
Nerve Tissue

  • NEURON is the main nerve cell

    • Cell Body(3)

    • Dendrites (5)

    • Axon(1)



Motor neurone1
Motor Neurone

  • Cell body

  • Dendrites

  • Axon

    • Covered by Myelin sheath


Neuron
Neuron

  • Multipolar

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


Neuron s cerebral cortex
Neuron's – cerebral cortex

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


Neuron s spinal cord
Neuron's – spinal cord

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy



Nerve fiber axon
Nerve Fiber (Axon)

  • Nerve fibers are long nerve cell processes (axon cylinder, axon) with a surrounding membrane

  • Schwann cells (neurolemmocytes, peripheral glial cells) enfold the axon and form an insulating cover known as Schwann’s sheath (neurolemma).

Stain: osmium tetroxide; magnification: × 1000

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


Nerve fiber axon1
Nerve Fiber (Axon)

  • Myelinated nerve fiber, i.e., the axon is covered by a myelin sheath, which is rich in lipids.

  • Every 0.8 to 1.0 mm, a node of Ranvier subdivides the myelin sheath into segments or internodes.

Stain: osmium tetroxide; magnification: × 1000

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


Sciatic nerve cross section
Sciatic nerve – cross section

  • 1 Fascicle (nerve fiber bundle)

  • 2 Perineurium

  • 3 Epineurium

  • 4 Artery

  • 5 Vein

  • 6 Adipose

    tissue

Stain: alum hematoxylin; magnification: × 10

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


Glial cells
Glial Cells

  • Glial cells (Neuroglia) or (Glia)

  • (Greek "glue”

  • Non-neuronal cells that:

    1- maintain homeostasis,

    2-form myelin,

    3- provide support and protection for the brain's neurons

  • They occupy the entire space between neurons and separate nerve cells from blood vessels


Glial cells functions
Glial Cells - Functions

  • Surround neurons and hold them in place

  • Supply nutrients and oxygen to neurons

  • Insulate one neuron from another

  • Destroy pathogens and remove dead neurons


Glial cells types
Glial Cells - Types

  • Astrocytes (macroglia)

  • Oligodendrocytes

  • Microgliocytes


Astrocytes
Astrocytes

  • Most abundant

  • Deal with homeostasis – relate to vessels

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


  • are characteristic star-shaped glialcellsin the brain and spinal cord. They perform many functions, including :

  • 1- biochemical support of endothelial cells that form the blood–brain barrier,

  • 2- provision of nutrients to the nervous tissue,

  • 3-maintenance of extracellular ion balance,

  • 4- and a role in the repair and scarring process of the brain and spinal cord following traumatic injuries


Astrocytes and nerve cells
Astrocytes and nerve cells

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy



Microglia microglia are the main resident immunological cells the cns
Microglia:Microglia are the main resident immunological cells the CNS

  • Oligodendrocytes:

    • Closely related to neurons

    • Provide myelin protection for CNS neurons


Neurons and glial cells
Neurons and glial cells

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


Neuron and glial cells
Neuron and glial cells

Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy


Summary
Summary

  • Nerve Tissue Cells:

    • Neurons:

      • Myelinated

      • Non-myelinated


Summary1
Summary

  • Nerve Tissue Cells:

    • Neurons:

      • Myelinated

      • Non-myelintaed

    • Neuroglial cells:

      • Astrocytes

      • Microglia

      • Oligodendrocytes


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