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 coronary artery

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Difference between right and left coronary artery 

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Topic
Right coronary artery
Left coronary artery
Aortic sinus
It arises from anterior aortic sinus of ascending aorta
It arises from left posterior  aortic sinus of ascending aorta
Size
Smaller than the left coronary artery
Bigger than the right coronary artery
Course
1.       It passes forwards and to right between the pulmonary trunk and right auricle
2.       Then it passes along the anterior right part of atrioventricular groove
3.       Then it crosses the inferior border
4.       Then it passes downwards and to the left along the posterior part of atrioventricular groove
5.       Then it reaches crux of the heart
6.       Then it descend through the posterior interventricular groove
1.       It runs forwards and to the left between the pulmonary trunk and left auricle
2.       Then it  divides into anterior interventricular branch and circumflex branch
3.       The anterior inter-ventricular branches of left coronary artery descend downward along the anterior inter-ventricular groove and anastomosis with posterior inter-ventricular branch of left coronary artery
4.       The circumflex branch cross the left border of heart
5.       It then passes along the left posterior part of atrioventricular groove
6.       Then it anastomosis with branch of right coronary artery just left of the crux of heart  
Branches
Right conus artery
Arterial branches
Right marginal artery
Anterior ventricular branches
Posterior ventricular branches
Posterior interventricular artery
Anterior interventricular artery
Circumflex artery
Diagonal artery
Conus artery
Atrial branches
Distribution
It supplies
1.       whole of right atrium
2.       most of the right ventricle except a strip along the anterior interventricular septum
3.       posterior inferior one third of ventricular septum
4.       S.A. node  and A.V. node in the majority of subjects
It supplies :
1.       Most of the left atrium
2.       Most of the left ventricle except a strip along the posterior and inferior surfaces of the heart posterior and inferior surfaces of the heart
3.       Anterior superior 2/3 of the ventricular septum
Coronary dominance
90% individuals are right coronary dominance. it means ventricular septum is supply by both right and left coronary artery.
posterior inferior part of 1/3 of ventricular septum is  supply by posterior interventricular branch of right coronary artery
anterior superior part of 2/3 of ventricular septum is supply by anterior interventricular branch of left coronary artery
10% individuals are left coronary dominance. It means ventricular septum is supply only by left coronary artery.
posterior inferior part of 1/3 of ventricular septum is  supply by circumflex branch of  branch of left coronary artery
anterior superior part of 2/3 of ventricular septum is supply by anterior interventricular branch of left coronary artery

First branch

Right conus artery
Anterior interventricular branch of left coronary artery

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