Secondary Lymphoid Organs: Lymph Nodes definitions Flashcards
Secondary Lymphoid Organs: Lymph Nodes definitions
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Lymph nodes Small, bean-shaped structures that filter lymph and trap pathogens, crucial for immune response. Hilum Indentation in a lymph node where efferent lymphatic vessels exit. Cortex Outer region of a lymph node, rich in B lymphocytes and lymphoid follicles. Medulla Inner region of a lymph node containing both B and T lymphocytes. Afferent vessels Lymphatic vessels through which lymph enters a lymph node. Efferent vessels Lymphatic vessels through which lymph exits a lymph node. Lymphoid follicles Densely packed spheres of lymphoid tissue in the cortex, containing dividing B cells. Medullary cords Lymphoid tissues in the medulla containing populations of B and T cells. Trabeculae Inward extensions of the capsule that partially divide the cortex into compartments. Sinuses Lymph-carrying channels within lymph nodes that filter pathogens. Subcapsular sinus Sinus located immediately beneath the capsule of a lymph node. Trabecular sinus Sinus parallel to the trabeculae, found in the outer cortex of a lymph node. Medullary sinus Sinus located in the medulla of a lymph node, part of lymph flow. Capsule Dense irregular connective tissue surrounding a lymph node, providing structural integrity. Lymphatic trunks Large lymphatic vessels formed by merging lymphatic vessels, leading to lymph nodes.