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 fasciculus gracilis and cuneatus

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 Difference between lateral spinothalamic , anterior spinothalamic and fasciculus gracilis and cuneatus 

Tract

Function

Receptor location

1st order neuron

2nd order neuron

3rd order neuron

Lateral spinothalamic tract

Carry pain and temperature sensation  

Skin

Dorsal root ganglia

Nucleus proprius in pos horn of spinal cord

Ventral posterior lateral nucleus of thalamus

Anterior spinothalamic tract

Crude touch and pressure

Skin

Dorsal root ganglia

Nucleus proprius in pos horn of spinal cord

Ventral posterior lateral nucleus of thalamus

Fasciculus gracilis & cuneatus

Fine touch , vibration ,

2 point discrimination

Skin , joint tendon

Dorsal root ganglia

Nucleus gracilis and cuneatus at medulla oblongata

Ventral posterior lateral nucleus of thalamus

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