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 medial and lateral geniculate body

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Difference between medial and lateral geniculate body


 


Medial geniculate body
Lateral geniculate body
Oval shaped collection of grey matter on the interior aspect of the pulvinar
Bean shapes collection of grey matter on the inferior aspect of the pulvinar
Hilum absent
Hilum present
Last relay station on the auditory  pathway
Last relay station on the optic pathway
Destruction of medial geniculate on one side has little or no effect on hearing
Destruction of lateral geniculate body on one side produces blindness in the opposite half of the field of vision  
Sends auditory impulse through auditory radiation to the auditory area of the temporal lobe
Sends visual impulses through optic radiation to the visual area of the occipital lobe of cerebrum
It is relay with inferior colliculus of midbrain
It is relay with superior colliculus of midbrain
The MGB has three major divisions; ventral (VMGB), dorsal (DMGB) and medial (MMGB). Whilst the VMGB is specific to auditory information processing, the DMGB and MMGB also receive information from non-auditory pathways.
LGN is normally described as having six distinctive layers. The inner two layers, (1 and 2) are magnocellular layers, while the outer four layers, (3,4,5 and 6), are parvocellular layers.  An additional set of neurons, known as the koniocellular layers, are found ventral to each of the magnocellular and parvocellular layers
It is more prominent than the lateral geniculate body
It is less prominent than the medial geniculate body
Efferent fibres of medial geniculate body is auditory radiation which passage through sublentiform part of internal capsule
Efferent fibres of lateral  geniculate body is optic  radiation which passage through retro-lentiform part of internal capsule

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