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 lateral spinothalamic, anterior spinothalamic and tract of gracilis & cuneatus

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Difference between somato-sensory pathways

Topics

Lateral spino-thalamic tract  

Anterior spinothalamic tract

Tract of gracilis & cuneatus

Sensation

Pain and temperature

Light touch and pressure

Discriminative touch, vibration , conscious muscle joint sense

Receptor

Free nerve ending

Free nerve ending

Meissners corpuscles, pacinian corpuscles, muscle spindles , tendon organ

1st order neuron

Posterior root ganglion

Posterior root ganglion

Posterior root ganglion

2nd order neuron

Substantia getalinosa

Substantia getalinosa

Nuclei gracilis and nuceatus

3rd order neuron

Ventral posterior lateral nucleus of thalamus

Ventral posterior lateral nucleus of thalamus

Ventral posterior lateral nucleus of thalamus

Related with Spinal lamniscus

Present

Present

Absent

Related with Medial lamniscus

Absent

Absent

Present

Destination

Post central gyrus

Post central gyrus

Post central gyrus

 

Lesion

Contra-lateral loss of pain and thermal sensibilities below the level of the lesion

Unable to sense pin prick or recognize hot or cold objects

Contra-lateral loss of light touch and pressure  sensibilities below the level of the lesion.

Discriminative touch will be present but unable to feel light touch of cotton placed against the skin  

Ipsilateral loss of muscle and joint sensation, two point discrimination and vibration  below the level of lesion but sense of light touch is unaffected

Movement are jerky or ataxic

 

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