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 greater sac and lesser sac

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Difference between greater sac and lesser sac
Greater sac
Lesser sac
The greater sac, also known as the general cavity (of the abdomen) or peritoneum of the peritoneal cavity proper, is the cavity in the abdomen that is inside the peritoneum but outside the lesser sac
It is connected with the lesser sac via the omental foramen also known as the foramen of Winslow or epiploic foramen,
The lesser sac, also known as the omental bursa, is the cavity in the abdomen that is formed by the lesser and greater omentum. Usually found in mammals, it is connected with the greater sac via the omental foramen
It extends across entire area of abdomen and from diaphragm to  pelvic floor
irregular space that lies behind liver, lesser omentum, stomach, upper ant part of greater omentum
5 recesses:
  • Subphrenic recess – peritoneal pocket between diaphram & antero superior  part of liver
    • separates into Right  & Left recesses by falciform lig
  • Subhepatic recess – peritoneal pocket between liver & transverse colon
  • Hepatorenal recess – deep peritoneal pocket between liver (ant) & kidney (post)
  • Morison’s pouch = formed by Right subhepatic & hepatorenal recess
    • comminucates with subphrenic recess, lesser sac via epoploic foramen, and Right  paracolic gutter(to pelvic cavity)
  • Paracolic recess –  lies lateral  to ascending /descending  colon
3 recesses:
  • Sup. recess – being liver, stomach, lesser omentum
  • Inf recess – behind stomach, extends into layers of greater omentum
  • Splenic recess – extends to the Left to the hilus of spleen

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