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 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 muscle, collagen and elastic fibres) and
        3.     Prominent internal elastic membrane
  

Topics
Features of Elastic artery
Features of  Medium sized artery 
Tunica media
consist of
 large amount of elastic lamellae and
smooth muscle cells present in between the elastic lamella 
circumferentially arranged smooth muscle cells, 
 with little elastic, collagen and reticular fibers 


Tunica adventitia
Relatively thinner
Formed  by connective tissue rich in collagen and elastic fibres
Relatively thicker
 -form by connective tissue rich in collegen and elastic fibres ,
external elastic membrane separated it from the tunica media
Example
•       Aorta
•       Pulmonary arteries
•       Brachiocephalic arteries
•       Common carotid artery
Brachial artery,
femoral artery
external carotid artery










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