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 1-4 palmar and 1-4 dorsal interossei


Origin




Insertion
1st palmar interossei
One attachment site at the Ulnar (medial) side of 1st metacarpal bone
1st dorsal interossei
Two attachment sites on the 1 & 2 metacarpal bones
Ulnar (medial ) side of the proximal phalanx of thumb
Radial (lateral) side of proximal phalanx of index finger





Origin





Insertion
2nd palmar interossei
One attachment site at the Ulnar (medial) side of 2nd  metacarpal bone
2nd  dorsal  interossei
Two attachment sites on the  2 & 3  metacarpal bones
Ulnar (medial) side of the proximal phalanx of index finger 
Radial (lateral ) side of proximal phalanx of middle  finger


Origin








Insertion
3rd palmar interossei
One attachment site at the Radial (lateral) side of 4th  metacarpal
3rd  dorsal  interossei
 Two attachment sites on the   3 & 4  metacarpal bones
radial side of the proximal phalanx of bone ring finger
ulnar (medial) side of proximal phalanx of middle  finger


Origin










Insertion
 4th palmar interossei
One attachment site at the Radial (lateral) side of 5th  metacarpal bone
4th  dorsal interossei
Two attachment sites on the 4 & 5  metacarpal bones
Radial side of proximal phalanx of little finger
Ulnar (medial) side of proximal phalanx of ring finger


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