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Showing posts from February, 2019

Comparison between tract and nerve

  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...

Difference between right and left umbilical veins

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

Difference between elastic artery and medium sized artery

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Difference between elastic artery and medium sized artery Topics Features of Elastic artery Features of   Medium sized artery Tunica intima consist of          endothelium with its basal lamina   .           subendothelial connective tissue is present (contain smooth muscle, collagen and elastic fibres) and               3.      an inconspicuous internal elastic membrane ( internal elastic membrane present but difficult to visualized in histological slide due to large amount of elastic fibres present in elastic artery)        1.      endothelium with its basal lamina         2.      subendothelial connective tissue is present (contain smooth ...