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 inductor and evacator

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Difference between inductor and evacator

Inductor :

  • An inductor is a tissue or group of cells present in embryonic life that sends signals to direct the development of another embryonic tissue.
  • It initiates or controls differentiation of specific embryonic tissue by releasing specific molecules (e.g., growth factors).
  • Example: Notochord acts as an inductor for the formation of the neural tube in early embryonic development. If notochord fail to form , there is no formation of neural tube

Evocator

  • An evocator is the chemical signal or molecular factor that carries out the induction process which occurred within embryonic tissue .
  • It is usually a protein, morphogen, or growth factor that triggers changes in the target embryonic cells.
  • Example: Bone Morphogenetic Proteins (BMPs), Sonic Hedgehog (Shh), and Fibroblast Growth Factors (FGFs) act as evocators in various developmental processes during interuterine life 
Inductor
Evocator
Inductor: A tissue elaborating a chemical substance that acts to determine the growth and differentiation of embryonic parts.
Evocator: a substance or tissue that induces differentiation of embryonic parts.
The effect of embryonic interaction or organizer is a morphogenetic effect by which one organic tissue transmits a chemical substance that influences other embryonic part to produce a structure that otherwise could not come into existence. The embryonic tissue which exerts such an influence is called an inductor
 the chemical substance secreted by an inductor is known as evocators.

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