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 thoracic and lumbar vertebra

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Difference between  thoracic and lumbar vertebra

Topic

Thoracic

Lumbar

body

1.Body is heart shaped 2.Anterior posterior measurement is greater than the transverse measurement

3. body bears costal facet

 

1.Body is big size and kidney shaped

2. Transverse measurement is greater than anterior posterior measurement

3. body is thick in front than behind

Transverse process

1. Big size face laterally and backwards 

2. Each process bears a facet which articulate with numerically corresponding tubercle of rib

1. Thin and elongated

2. An accessory process is present at its posterior inferior process

Spinous process

It is directed downward and backward

It is end with tubercle

It is quadrangular in shape and lies horizontally

Laminae

Short , broad & thick

Short , strong and broad

 

Pedicle

Project directly backwards

Short and strong and project from postero-lateral aspect of the body 

Superior articular process

Faces upward, backward & laterally

Concave process face backward and medially

Inferior articular process

Faces forwards, medially and downwards

Convex process faces forward and laterally

Vertebral foramen

Circular in shape

Size is smaller

Triangular in shape

Larger than thoracic vertebral but smaller than cervical vertebra

Special feature

Costal facet present on  the body

Massive body

Mamillary process is present at the posterior border of superior articular process

 

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