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 small intestine and large intestine: macroscopic or gross difference

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Difference between small and large intestine:
 Macroscopic difference or gross difference

Features
small intestine
large intestine
length
4.5 to 7 m
1.5 m
diameter
3.5-4.5 cm
4-6 cm
parts
It has three parts: duodenum, jejunum, ileum
it has four parts: caecum, colon( ascending colon, transverse colon, descending colon, sigmoid colon) , rectum & anal canal 
Haustration
absent
present
epiploiec appandages
absent
present
Peritoneum
most of the part is covered by peritoneum
except duodenum(retro- peritoneal )  most of the part is intra peritoneal
some parts of large intestine is covered by peritoneum
except ascending and descending colon, rectum and anal canal other part of large intestine is covered by peritoneum
peritoneal fold
the mesentery
mesoappendix, transverse mesocolon, sigmoid colon,
mobility
mobile ( suspended by the mesentery)
less mobile ( most part of it fixed: retroperitoneal  )
Function
digestion and absorption
absorption
Absorption
digestive nutrient
only water
hormones
secrete hormones
it secrete no hormones
Blood supply
by branches of superior mesenteric artery
by branches of superior and inferior mesenteric artery and internal iliac artery

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