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 ascending tract and descending tract

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Difference between ascending tract and descending tract

 

 

Ascending tract

Descending tract

The ascending tracts carry sensory information from the body, like pain, for example, up the spinal cord to the brain.

Descending tracts carry motor information, like instructions to move the arm, from the brain down the spinal cord to the body.

The ascending tracts to cerebral cortex (posterior column tracts, spinothalamic tracts) involve a chain of 3 neurons 1st 2nd and 3rd order neuron  to reach the cerebral cortex

The descending tract involve two sets of neuron upper motor neuron and lower motor neuron

Pathway from receptors to primary sensory area 3 1 2

Pathway from primary motor area 4 to target organs (skeletal muscle , smooth muscle and gland)

It carries sensory information from periphery to brain

It carries motor order from brain to periphery target organ

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