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 relation of right and left ureter

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Difference between  relation of right and left ureter

Right ureter

Left ureter

Anterior relation:

2nd part of the duodenum

Right colic vessels
Ileocolic vessels
Right testicular or ovarian vessels
Root of mesentery

Anterior relation:

Left colic vessels

Sigmoidal vessels
Left testicular or ovarian vessels
Sigmoid mesocolon

Posterior relation:

Right psoas major

bifurcation of right common iliac artery

Posterior relation:


Left psoas major
Bifurcation of left common iliac artery

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