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 inflowing and outflowing part of right ventricle

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Interior of right ventricle:
Internally it has two parts
1.     inflowing rough part due to trabeculae carneae  ( muscular ridges of the heart ) and
2.      outflowing smooth part also known as infundibulum. The two part are separated by a muscular ridge known as supraventricular crest.
The cavity of the right ventricle is crescent shape in cross section because the interventricular septum make a bulge toward the right ventricle.

Moderator band: (septomarginal trabeculum)
it is the unique features of the right ventricle , a thick muscular ridge extending from the ventricular septum to the base of the anterior papillary muscle. It conveys the right branch of the atrioventricular bundle (bundle of His) , a part of conducting system of the heart . 
Function : it prevent overdistension of right ventricle of heart 

Trabeculae carneae of right ventricle:
Three types of muscular projections are present in trabeculae carneae of right  ventricle.
They are
1.     Ridges : fixed muscular elevations
2.     Bridges : two ends are fixed with central free portion
3.     Papillary muscles of  right ventricle: are  three in number : anterior , posterior and septal.




Inflowing part of right ventricle
Out flowing part of right ventricle
It is the lower part of right ventricle
It is the upper  part of right ventricle
This part is rough
This part is smooth
It is larger than the out flowing part
It is smaller than the inflowing part
It is situated below the supraventricular crest
It is situated above  the supraventricular crest
It is rough due to trabeculae carneae
It is smooth and form upper 2.5 cm conical part of the right ventricular chamber –the infundibulum, which gives rise to pulmonary trunk

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