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Showing posts from February, 2022

Comparison between tract and nerve

  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...

Difference between alar plate and basal plate of the mantle layer of neural tube

  Difference between alar plate and basal plate  of the mantle layer of neural tube Alar plate Basal plate The  alar plates  (or  alar lamina ) is a neural structure in the embryonic nervous system. Sensory area in the dorsal region of the spinal cord and brain In the developing  nervous system , the  basal plate  is the region of the  neural tube  ventral to the  sulcus limitans they develops from dorsal aspect of mantle layer of neural tube they develops from ventral   aspect of mantle layer of neural tube Functional components deal by alar plate :    Cells within the alar plate develop into afferent and interneurons. The alar plate further develops general sensory afferents (GSA) innervating the skin, special sensory afferents (SSA) innervating the branchial arch derivatives, and visceral sensory af...