The medullary sinuses are vessel-like spaces between the cords of lymphatic tissue that are located in the medulla of a lymph node. The medullary sinus is filled with macrophages and reticular cells. Histiocytes, a form of macrophage in the medulla, span a network of pseudopods that filter the sinuses of incoming pathogens.
¥M. tuberculosis can, therefore, be seen within macrophages in the medullary sinus.
immunology
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