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 duodenum and the rest of the small gut

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Difference between duodenum and the rest of the small gut 

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Duodenum
Rest of small gut
Length 25 cm
6 mitre
It is fixed
It is mobile
It is devoid of mesentery
It is suspended by the mesentery
It is supplied by two rows of vasa recta
It is supplied by single row of vasa recta and the vessels distribute in alternate manner
Submucosal coat contain Brunner’s gland
No glands in the submucosa
It is developed from both foregut and midgut 
It is only developed from midgut
Both major and minor duodenal papilla are open in to it postero-medial wall
papilla absent in rest of the small intestine
It is supply by
superior pancretoduodenal artery branch of gastroduodenal artery (branch of hepatic artery which is the branch of the celiac trunk , celiac trunk is the artery of foregut
Inferior pancreotoduodenal atery which is the first  branch of superior mesenteric artery  
It is supply by jejuna and ileal branch of superior mesenteric artery (this is the artery of midgut )
It posterior wall is devoid of peritoneum so it is a retroperitoneal organ
It is an intra peritoneal organ

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