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 atypical thoracic vertebrae( T1, T9-12) and typical thoracic vertebra (T2-8)

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Difference between atypical thoracic vertebrae( T1, T9-12) and typical thoracic vertebra (T2-8) 
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Atypical vertebra
Typical vertebra
(T2-8)
T1
T9
T10
T 11
T12
Body
Like cervical vertebra
Heart shape
Heart shape
Heart shape
Like lumbar vertebra
Kidney shape
Heart shape
Superior costal facet
Circular
Demifacet
Large circular costal facet
Large circular costal facet
Large circular costal facet extending onto the root of tubercle
Demifacet
Inferior costal facet
Small and present
Absent
Absent
Absent
Absent
Small and present
Superior vertebral notch
Deep and clearly seen
Shallow
Shallow
Shallow
Shallow
Shallow
Costal facet on transverse process
Present
Present
Present
Absent
Absent
Present
Vertebral foramen
Large and triangular
Small and circular
Small and circular
Small and circular
Small and circular
Large and triangular
Transverse process
Long
Large and club shaped
Large and club shaped
Large and club shaped
Large and club shaped
Small and presents three tubercles : superior, inferior and lateral
Superior tubercle correspond with mamillary process
Inferior tubercle correspond with accessory tubercle and lateral tubercle represent as true transverse process  
Spinous process
Long and horizontal
Long and directed downward and backward
Long and directed downward and backward
Long and directed downward and backward
Long and directed downward and backward



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