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 parietal pleura and visceral pleura

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pleura

Pleura: /pleu·ra/ (ploor´ah) pl. pleu´rae   [Gr.] the serous membrane investing the lungs (visceral p.) and lining the walls of the thoracic cavity (parietal p.); the two layers enclose a potential space, the pleural cavity. The two pleurae, right and left, are entirely distinct from each other.pleu´ral cavity .
 


Parietal pleura : it is the outer part of serous sac which lines the thoracic wall and mediastinum.
It develops from somatopleuric layter of lateral plate mesoderm .Innervated by somatic nerves
It is sensitive to pain
Blood supply and lymphatic draianage is same as that of thoracic wall 




Visceral pleura
Lines the surfeces of lung except hilum.  It develops from splanchnopleuric layter 
of lateral plate mesoderm. Innervated by autonomic nerves
It is insensitive to pain. It  is only sensitive to stretch.
Blood supply and lymphatic drainage is same as that of the lung 


Difference between parietal pleura and visceral pleura
Parietal pleura
Visceral pleura
Lines the thoracic wall and mediastinum
Lines the surfeces of lung except hilum
it is divided into four part cervical pleura , mediastinal pleura, costal pleura and diaphragmatic pleura
It has no division
It develops from somatopleuric layter of lateral plate mesoderm
It develops from splanchnopleuric layter of lateral plate mesoderm
Innervated by somatic nerves
Innervated by autonomic nerves
It is sensitive to pain
It is insensitive to pain
It is only sensitive to stretch.
Blood supply and lymphatic draianage is same as that of thoracic wall
Blood supply and lymphatic drainage is same as that of the lung



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