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stomach volvulus gastric volvulus stomach developm dr manchiraju venous sinuses brain dural sinuses skull sinuses cavernous sinus venous sinuses of brain sinus parotid gland parotid salivary gland salivary glands parotid lymphoid tissue palatine tonsil tonsil vessels of sole of foot blood vessels of foot blood supply of foot sole of foot muscles of sole of foot layers of muscles foot human foot structure arches of foot bones of foot hamstring sciatic nerve course of sciatic nerve hamstring muscles pericardium heart pericardium external features thalamus ppt anatomy of thalamus thalamus duodenum structure ppt of duodenum power point presentation duodenum anatomy of duodenum anatomy anal canal anal anal canal