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 arteriole & capillary

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Difference between

  Arteriole & capillary

Vessel

Diameter

Tunica intima

(inner layer)

Tunica media

Middle layer

Tunica adventitia

Outer layer

Vasa vasorum

Arteriole

10–100 μm

This layer contain

1. endothelium & its basement membrane

2. Subendothelial connective tissue is formed by loose connective tissue which contain smooth muscle cells

3. no  internal elastic lamina  

 

Circularly arrange smooth muscle cells layers(1-2 cells layer)  with variable amounts of elastin, reticular fibers, and

proteoglycans are interposed between the smooth muscle

cells

 

Thin, ill-defined sheath of

connective tissue

Absent

Capillary

4–10 μm

This layer contain

endothelium & its basement membrane

 

 

None

None

Absent

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