Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Difference between Schwann cell and oligodendrocyte

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Difference between Schwann cell and oligodendrocyte

Schwann cells

Oligo-dendrocyte

Schwann cells are derived from the neural crest.

Oligodendrocyte are derived from neuroectoderm

A Schwann cell is a  glial cell that is wrapped around an axon of the nerve cells in the peripheral nervous system.

 An oligodendrocyte is a glial cell with several slender processes, which is wrapped around the axons of the nerve cells in the central nervous system.

 

 Schwann cells insulate the axons of the nerve cells in the peripheral nervous system.

Oligodendrocytes insulate the nerve cells in the central nervous system.

Schwann cells are capable of insulating only a small segment of  single axon.

Oligodendrocytes are capable of insulating small segment of  different axons (upto 50) at once.

Schwann cells present in both myelinated and nonmyelinated nerve fiber

They are present only in myelinated nerve fiber

Schwann cells do not consist of cytoplasmic projections.

Oligodendrocytes consist of cytoplasmic projections.

The diseases associated with Schwann cells are the Guillain–Barré Syndrome, the Charcot–Marie-Tooth disease, and leprosy.

The diseases associated with oligodendrocytes are spinal cord trauma, multiple sclerosis, cerebral palsy, and leukodystrophies.

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