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Showing posts from December, 2020

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 Schwann cell and oligodendrocyte

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  Difference between Schwann cell and oligodendrocyte Schwann cells Oligo-dendrocyte Schwann cells are derived from the neural crest. Oligodendrocyte are derived from neuroectoderm A Schwann cell is a  glial cell that is wrapped around an axon of the nerve cells in the peripheral nervous system.   An oligodendrocyte is a glial cell with several slender processes, which is wrapped around the axons of the nerve cells in the central nervous system.     Schwann cells insulate the axons of the nerve cells in the peripheral nervous system. Oligodendrocytes insulate the nerve cells in the central nervous system. Schwann cells are capable of insulating only a small segment of   single axon. Oligodendrocytes are capable of insulating small segment of   different axons (upto 50) at once. Schwann cells present in both my...
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Difference between microglia and microglia

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  Difference between microglia and microglia Microglia Macroglia Microglia   are generally derived from mesoderm Macroglia  (astroglia and oligodendroglia) are generally considered to be derived from neuroectoderm They have no function in normal brain They have function in normal brain
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Difference between histology of stomach and large intestine : lecture note

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Difference between histology of stomach and large intestine     Topic Histology of stomach Histology of ileum     Histological layer from within outward Mucosa Submucosa Muscularis externa Serosa (most of the part) Mucosa Submucosa Muscularis externa   serosa and adventitia     Lining epithelium Simple columnar epithelium Simple columnar epithelium with large number of goblet cells   Lamina propria Contain gastric gland Contain intestinal gland Muscularis mucosa Thin Thin Submucosa Contain no gland Contain no   gland Muscularis externa Smooth muscle cells are arranged in three layers Inner oblique Middle circular Outer longitudinal Smooth muscle cells arrangement...
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Difference between histology of stomach and ileum : lecture note

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Difference between histology of stomach and ileum     Topic Histology of stomach Histology of ileum     Histological layer from within outward Mucosa Submucosa Muscularis externa Serosa (most of the part) Mucosa Submucosa Muscularis externa   serosa (intraperitoneal organ)   Lining epithelium Simple columnar epithelium Simple columnar epithelium with large number of goblet cells   Lamina propria Contain gastric gland Contain intestinal gland Muscularis mucosa Thin Thin Submucosa Contain no gland Contain no   gland Muscularis externa Smooth muscle cells are arranged in three layers Inner oblique Middle circular Outer longitudinal Smooth muscle cells arrangement   ...
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