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 transverse and oblique sinus of pericardium

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Difference between transverse and oblique sinus

Transverse sinus

Oblique sinus

It is an inter-visceral space

It is placed between parietal and visceral layer of pericardium

It is tubular in shaped

Inverted ‘J’ shaped

 

It is open above

It is closed on all sides except below

Anteriorly : left atrium and visceral layer of serous pericardium

 

Anteriorly : ascending aorta and pulmonary trunk  

 

Posteriorly :  parietal layer of pericardium and fibrous pericardium

 

Posteriorly : intra-pericardial part of superior vena cava and upper margin of left atrium

 

Above : upper margin of left atrium

 

Above bifurcation of pulmonary trunk

 

Inferiorly: Below upper surface of left atrium

 

open

 

 Function of transverse sinus:

During cardiac surgery, following the pericardial sac is opened anteriorly, a finger is gone through the transverse sinus of pericardium, posterior to the aorta and pulmonary trunk. A temporary ligature is gone through the transverse sinus around the aorta and pulmonary trunk.

Function of oblique sinus:

 The oblique sinus permits the distension

of left atrium during return of oxygenated

blood in it from the lungs.

 

Development:

it is developed after degeneration of the central cells of the dorsal mesocardium 

Development:

.It develops as an effect of absorption of 4 pulmonary veins into the left atrium

 

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