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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 superior and inferior gluteal nerve

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Difference between superior and inferior gluteal nerve  Superior gluteal nerve Inferior gluteal nerve It arises from dorsal branches of the ventral rami of the 4 th and 5 th lumbar and 1 st sacral spinal nerves It arises from dorsal branches of the ventral rami of the   5 th lumbar , 1 st and 2 nd sacral spinal nerves It enters in the gluteal region above the piriformis muscle It enters in the gluteal region below the piriformis muscle It divides into two branches : for gluteus medius & gluteus minimus and tensor fasciae latae It supply only gluteus maximus muscle It is related with superior gluteal vessels It is related with sciatic nerve   but the relationship between the inferior gluteal nerve and artery was found to be unpredictable.   No consistent relationship between the inferior gluteal artery and the inferior gluteal nerve was observed in current studies ...
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Difference between white rami and gray rami communicans

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Difference between white rami and gray rami communicans Gray and white rami communicans are related with sympathetic system. Both gray and white rami communicans are attached with ventral ramus of thoracic and lumbar spinal nerves. Only gray rami communicans are attached with ventral ramus of cervical, sacral and coccygeal spinal nerves. Through white rami communicans pre-ganglionic sympathetic fibre leave the spinal nerves and enter into sympathetic ganglia . pre- ganglionic fibres are myelinated so it looks white. Through gray rami communicans post-ganglionic sympathetic fibre again enter into the spinal nerve , leave the sympathetic ganglia. Post ganglionic sympathetic fibres are non- myelinated so it looks gray. Gray and white rami communicans are the lateral branch of sympathetic ganglia which connect ventral ramus of corresponding spinal nerve. White rami communicans has distal connection with ventral ramus of spinal nerve. Gray rami communicans has proxima...
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Difference between sphincter papillae and dilator papillae

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Difference between sphincter papillae and dilator papillae sphincter papillae  Dilator papillae They are involuntary   muscle fibers of the iris, which arranged circularly   They are involuntary   muscle fibers of the iris , which running radially It is only present in papillary margin of iris It is present radially from papillary margin to periphery   It is supplied by parasympathetic fibers from Edinger-westphal nucleus of oculomotor nerve. It is supplied by sympathetic fibers  Function: constrictor of the pupil. It is widening the pupil and allowing for more light to pass through the eye.
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