Systemic Histology - Lymphatic System

Vocabulary flashcards based on the provided lecture notes on the Lymphatic System and Systemic Histology.

Cortex (Lymph Node)

Outer region of the lymph node containing lymphoid nodules.

Medulla (Lymph Node)

Inner region of the lymph node containing medullary cords and sinuses.

Stroma

A type of specialized reticular connective tissue that classifies lymphoid tissue.

Immunocompetent Cells

Cells that can react with and neutralize antigens and distinguish self from nonself.

MALT (Mucosa-Associated Lymphoid Tissue)

Lymphocyte aggregates found throughtout gastrointestinal, respiratory, and genitourinary tracts.

Lymphatic Nodules

Small collections of lymphoid tissues present in digestive, respiratory, and urinary systems.

Cluster Designation (CD)

Surface receptors on lymphocytes.

Antigen-Presenting Cells (APCs)

Cells that phagocytose and degrade antigens.

Epitopes

Highly antigenic peptides recognized by T-cells.

Lymphoid Nodules (Follicles)

Dense aggregations of lymphocytes arranged as spherical, unencapsulated clusters.

Primary Lymphoid Organs

Lymphoid organs where lymphocytes are produced and mature.

Secondary Lymphoid Organs

Lymphoid organs in which immune responses occur.

Epithelial Reticular Cells (ERCs)

Specialized thymus cells that form the supportive framework.

Hassall Corpuscles

Spherical bodies in the thymus medulla that help differentiate it from other lymphoid organs.

Paracortex

Region of lymph nodes where T lymphocytes migrate.

Lymph Node

The only lymphoid structure that has both afferent and efferent lymphatics

PALS (Periarteriolar Lymphatic Sheaths)

Region of the spleen where T cells are found around the central arteriole

Marginal Zone (Spleen)

Shell of sparsely cellular lymphoid tissue surrounding white pulp in the spleen.

Splenic Cords (of Billroth)

Thin-walled venous sinusoids and intervening cellular cords in the red pulp of the spleen.

Tonsillar Crypts

Deep invaginations in the palatine tonsils where the epithelial lining is infiltrated with lymphocytes.