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 dendrite and axon

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Difference between dendrite and axon

Dendrite
Axon
Nerve process of neuron received information from other neuron or from external environment  toward the nerve cell body
Effector processes that transmit stimuli to other neuron or effector cells and carry information away from the cell body
greater diameter than axon and usually short & tapered
narrower than the dendrite and cylindrical  and extremely long (golgi type 1 neuron has axon  more than a meter to reach the effector organ but golgi type II neuron has very short axon
unmyelinated
myelinated but smaller axon of autonomic nervous system are unmyelinated and surrounded only by Schwann cell cytoplasm
dendrite produces extensive arborizations called dendritic trees which significantly increase the receptors surface area of a neuron
axon may give recurrent branch near the cell body: a branch of axon that turns back towards the cell body  and  some collateral branches near the terminal end
it contain all organelles like cell body expect golgi complex.

dendrite has no role to maintain  cell memory

it is lack of large cytoplasmic organelle Nissl bodies, microtubules , neurofilaments, mitochondria, vesicles, golgi complex but some axon terminal (retina) contain polyribosomes with complete translational machinery for protein synthesis . protein synthesis within the axon terminal processes neuronal cell memory

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