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 spinal lemniscus, medial lemniscus , lateral lemniscus and trigeminal lemniscus

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 Difference between spinal lemniscus, medial lemniscus , lateral lemniscus and trigeminal lemniscus 

Spinal lemniscus

Medial lemniscus 

Lateral lemniscus

Trigeminal lemniscus

It is the part of the anterior and lateral spinothalamic tracts . The axons of anterior spinothalamic tract,  lateral spinothalamic tract are  merge with the spinotectal pathway at medulla oblongata and these  combined tract is known as the spinal lemniscus.

It is the part of fusciculus gracilis and cuneatus which  is formed by crossed  axons of nucleus gracilis and cuneatus at medulla oblongata

It is the part of auditory pathway which is formed by crossed and uncrossed axon of cochlear nuclei 

The trigeminal lemniscus is composed of second order neuronal axons in the brainstem. It carries sensory information from the trigeminal system to the ventral posteromedial (VPM) nucleus of the thalamus

 

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