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 elastic artery, muscular artery, small size artery, arteriole and capillary

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 Difference between elastic artery, muscular artery, small size artery, arteriole and capillary 

Vessel

Diameter

Tunica intima

(inner layer)

Tunica media

Middle layer

Tunica adventitia

Outer layer

Vasa vasorum

Large size artery or 

Elastic artery

>10 mm

This layer contain

1. endothelium & its basement membrane

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

3. internal elastic lamina is present but cannot see clearly in histological slide

 

Circularly arrange smooth muscle layers are separated by fenestrated elastic lamina

Connective tissue rich with longitudinally arrange collagen fibres

Elastic fibers

Thinner than tunica media

Present

Medium sized artery or muscular artery

2–10 mm

This layer contain

1. endothelium & its basement membrane

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

3. internal elastic lamina is prominent 

 

Circularly arrange smooth muscle cells layers with variable amounts of elastin, reticular fibers, and

proteoglycans are interposed between the smooth muscle

cells

the amount of elastic fibres are relatively less 

Connective tissue

Some Elastic fibers

Thinner than tunica media

Present

Small artery

0.1–2 mm

This layer contain

1. endothelium & its basement membrane

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

3. internal elastic lamina is present 

 

Circularly arrange smooth muscle cells layers (8-10 cells layer) with variable amounts of elastin, reticular fibers, and

proteoglycans are interposed between the smooth muscle

cells

 

Connective tissue

Some Elastic fibers

Thinner than tunica media

Present

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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