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 three openings of the diaphragm : lecture note

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Difference between three openings of the diaphragm

Topics

Vena caval opening

Esophageal opening

Aortic opening

Formation

By connective tissue membrane

By skeletal muscle

Aponeurosis (connective tissue) and bone

Location

In the central tendon slightly to the right of median plane

In the muscular part of the diaphragm slightly to the left of median plane

In the midline behind the median arcuate ligament

Vertebral level

In front of the body of T8

In front of the body of T 10

Lower border of body of T12

Shape

Quadrangular or square

Oval or elliptical

Circular or round

Structures passing through

Inferion vena cava

Right phrenic nerve

Esophagus

Right & left vagal trunks

Esophageal branches of left gastric artery

Azygos vein

Thoracic duct

Aorta

During inspiration

Diameter increase

Close the opening

No change

 

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