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 typical long bone , miniature long bone and modify long bone

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Difference between typical long bone , miniature long bone and modify long bone

Topics

Typical long bone

Miniature long bone

Modify long bone

Parts in adult

Upper end , shaft and lower end

Head , shaft and base

Sternal end , shaft and acromial end

Parts in growing bone (children )

Epiphysis, epiphyseal cartilage , diaphysis , epiphyseal cartilage , epiphysis

Epiphysis , epiphyseal cartilage , diaphysis

One medial epiphysis near the sterna end , epiphyseal cartilage , two diaphysis , epiphyseal cartilage,  one lateral epiphysis near the acromial end

Epiphysis

Two (upper and lower) or more than two

One epiphysis for base of 1st metacarpal and 1st metatarsal , phalanges .

One epiphysis for head of 2nd to 5th metacarpal and metatarsal bone  

Two epiphysis : medial and lateral

Location

Vertical

Vertical

Horizontal

Ossification

Intracartilaginous

Intracartilaginous

Intra membranous

 

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