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 mediastinal surfaces of right and left lung

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Difference between mediastinal surfaces of right and left lung 



Mediastinal part of lung:
the impression and relation of mediastinal surface differ in two lungs
Mediastinal surface of right lung:
Cardiac area is related with   Anterior surface of Right auricle, Anterior and right surface of right atrium,  Part of anterior surface of right ventricle  
In front of hilum upper part : Groove for SVC
In front of hilum lower part groove for  IVC are present
Above the hilum : groove for azygous vein
Behind the hilum : osophagus except upper and  lower part
From apex to groove for azygous vein:Anterioposteirly
Right brachiocephalic vein,Trachea,Osophagus
Three neural structures:right phrenic nerve, Right vagus nerve, Right sympathetic chain


Mediastinal surface of left lung
Cardiac area is related withAnterior and left surface of left ventricle and left auricle, Anterior surface of a part of the right ventricle
In front of hilum : upper part impression for ascending aorta
Just below and little in front  the ascending aorta , the impression for pulmonary trunk is present
Above the hilum : arch of aorta
Behind the hilum: descending thoracic aorta and osophagus present just above  and below the descending aorta
So osophagus is related twice with the left lung  
From apex to groove for arch of aorta  
Anterioposteirly
Left common carotid arter,Left subclavian artery,Trachea,Osophagus,Thoracic duct
Four neural structures
Left  phrenic nerve
Left  vagus nerve
Left recurrent laryngeal nerve
Right sympathetic chain



Mediastinal surface of right lung
Mediastinal surface of left lung
Cardiac area is related with
·         Anterior surface of Right auricle
·         Anterior and right surface of right atrium
·         Part of anterior surface of right ventricle  
Cardiac area is related with
Anterior and left surface of left ventricle and left auricle
Anterior surface of a part of the right ventricle
In front of hilum upper part : Groove for SVC
In front of hilum lower part groove for  IVC are present
In front of hilum : upper part impression for ascending aorta
Just below and little in front  the ascending aorta , the impression for pulmonary trunk is present
Above the hilum : groove for azygous vein
Above the hilum : arch of aorta
Behind the hilum : osophagus except upper and  lower part
Behind the hilum: descending thoracic aorta and osophagus present just above  and below the descending aorta
So osophagus is related twice with the left lung  
From apex to groove for azygous vein
Anterioposteirly
Right brachiocephalic vein
Trachea
Osophagus
From apex to groove for arch of aorta  
Anterioposteirly
Left common carotid artery
Left subclavian artery
Trachea
Osophagus
Thoracic duct

Three neural structures
Right phrenic nerve
Right vagus nerve
Right sympathetic chain
Four neural structures
Left  phrenic nerve
Left  vagus nerve
Left recurrent laryngeal nerve
Right sympathetic chain

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