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 right and left ventricle : with easy and short description

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Right and left ventricles of heart :
The heart consists of four chambers:
·        Right and left atrium both are separated by interatrial septum
·        Right and left ventricle both are separated by interventricular septum
Right ventricle:
 The wall of the right ventricle is thicker than the atrium but it is less thick than the left ventricle.
It contains two orifices
1.     Right atrioventricular orifice: by this orifice deoxygenated blood of right atrium enters into the right ventricle
2.     .2. Pulmonary orifice : by this orifice it sends it deoxygenated blood to the lung via pulmonary trunk for oxygenation.  
Externally it forms most the sternocostal surface and 1/3 of diaphragmatic surface. It also form inferior border. It is separated from right atrium by atrioventricular sulcus /groove or coronary sulcus. It also separated from left ventricle by two groove anterior and posterior interventricular groove . 

Internally it has two part inflowing rough part due to trabeculae carneae ( muscular ridges of the heart ) and 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 of the moderator band: it prevents the overdistension of right ventricle.







left ventricle:
 The wall of the left ventricle is thicker than the atrium and also  it is thicker than the right ventricle.
It contains two orifices
1.     Left  atrioventricular orifice: by this orifice oxygenated blood of left atrium enters into the left ventricle
2.      aortic orifice : by this orifice it sends it oxygenated blood to whole body via aorta..  
Externally it forms some part of  the sternocostal surface and 2/3 of diaphragmatic surface. It also form apex, left border. It is separated from left atrium by atrioventricular sulcus /groove or coronary sulcus. It also separated from right ventricle by two groove anterior and posterior inter-ventricular groove.  
Internally it has two part inflowing rough part due to trabeculae carneae ( muscular ridges of the heart ) and outflowing smooth part also known as infundibulum.  
The cavity of the left ventricle is circular shape in cross section because the interventricular septum makes a bulge toward the right ventricle.
Trabeculae carneae of ventricles:
Three types of muscular projections are present in trabeculae carneae of both ventricle.
They are
1.     Ridges : fixed muscular elevations
2.     Bridges : two ends are fixed with central free portion
3.     Papillary muscles : in right ventricle it is three in number : anterior , posterior and septal , in left ventricle it is two in number : anterior and posterior




Difference between right and left ventricle of heart
Topics
Right ventricle
Left ventricle
1.     Wall
Thinner
Thicker
2.     Receive blood from
Deoxygenated blood from Right atrium
Oxygenated blood from Left atrium
3.     Blood of the ventricle goes to
Lungs through pulmonary trunk
Whole body by aorta
4.     Papillary muscle
Three in number , anterior, posterior and septal
Two in number
Anterior and posterior
5.     Trabeculae carneae
Less prominent
More prominent
6.     Moderator band
present
Absent
7.     Shape of the cavity
Crescentic in shape
Circular in shape
8.     Supraventricular crest
Present
Absent
9.     Circulation
Pumps blood to the systemic circulation through the aorta
Pumps blood to the pulmonary circulation through the pulmonary arteries
10.                        Shape of the cavity
Oval in shape, forming the apex of the heart
Triangular in shape, located near the apex of the heart


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