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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 parietal pleura and visceral pleura

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pleura Pleura: /pleu·ra/ ( ploor´ah ) pl. pleu´rae   [Gr.] the serous membrane investing the lungs (visceral p.) and lining the walls of the thoracic cavity (parietal p.); the two layers enclose a potential space, the pleural cavity. The two pleurae, right and left, are entirely distinct from each other.pleu´ral cavity .   Parietal pleura : it is the outer part of serous sac which lines the thoracic wall and mediastinum. It develops from somatopleuric layter of lateral plate mesoderm .Innervated by somatic nerves It is sensitive to pain Blood supply and lymphatic draianage is same as that of thoracic wall  Visceral pleura Lines the surfeces of lung except hilum.  It develops from splanchnopleuric layter  of lateral plate mesoderm. Innervated by autonomic nerves It is insensitive to pain. It   is only sensitive to stretch. Blood supply and lymphatic drainage is same as that of the...
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Difference between right and left umbilical veins

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Difference between   right and left umbilical veins    A right umbilical vein is a relatively common variation (23:10,000) where the right umbilical vein persists instead of obliterating around 6 weeks as a result from enlargement of the liver. Right umbilical vein Left umbilical vein It is degenerate in 7 week of   fetal life it is degenate at least a week after birth   It is not continuous with ductus venosus It is continous with ductus venosus It carry no blood to fetus It carry oxygeneted blood to fetus from placenta It is not produce any adult structure In adult it is converted into round ligament of liver
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