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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 1 st palmar interossei One attachment site at the Ulnar (medial) side of 1 st metacarpal bone 1 st 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 2 nd palmar interossei One attachment site at the Ulnar (medial) side of 2 nd   metacarpal bone 2 nd   dorsal  inteross ei 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 3 rd palmar interossei One attachment site at th...
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Difference between the palmar Interossei & dorsal interossei muscles of the hand

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Difference between the palmar Interossei  & dorsal interossei muscles of the hand Palmar  interossei Dorsal interossei Character Uni-pennate Bi-pennete Size Smaller than the dorsal interossei Larger than the palmar interossei Origin by single head-from one side of the the body of the palmar surface of metacarpal bones By two heads; from the adjacent sides the bodies of all metacarpal bones View They are only seen from the palmar aspect of the interosseous space Dorsal interossei can be seen from both dorsal and palmar aspects Action Abduction-Carry the fingers or toes towards the middle line PAD : P : palmar interossei AD : adduction Abduction; carry the fingers or toes away from the middle line DAB: D: dorsal interossei AB: abduction Special note Thumb require no Palmaris interossei thumb already possessing...
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