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 cervical and thoracic vertebra

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 Difference between cervical and thoracic  vertebra

Topic

Cervical

Thoracic

body

1. Smallest of all vertebra

2.Transverse measurement is greater than anterior posterior measurement

3.Superior surface is concave

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

3. body bears costal facet

 

Transverse process

1.It is pierce by foramen transversarium

2.It has anterior and posterior root which is connected by costo-transverse bar

1. Big size face laterally and backwards 

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

Spinous process

Short , bifid and horizontal

It is directed downward and backward

It is end with tubercle

Laminae

Long and narrow

Short , broad & thick

Pedicle

Project laterally and backwards

Project directly backwards

Superior articular process

Faces upwards and backwards

Faces upward, backward & laterally

Inferior articular process

Faces downwards and forwards

Faces forwards, medially and downwards

Vertebral foramen

Triangular in shape

Large in proportion to the size of the body

Circular in shape

Size is smaller

Special feature

Foramen transversarium

Costal facet present on  the body

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