Lymphoid System VIBS 443602 OBJECTIVES PURPOSE OF THE
Lymphoid System VIBS 443/602
OBJECTIVES PURPOSE OF THE IMMUNE SYSTEM CELLULAR BASIS OF IMMUNITY EFFECTORS OF RESPONSE INDUCTION OF THE RESPONSE ONTOGENY
FUNCTIONS OF THE IMMUNE SYSTEM • PROTECTION AGAINST FOREIGN INVADERS INTO BODY • PRODUCE / PROTECT GERM FREE ENVIRONMENT OF THE BODY
Thymus
123 Thymus, newborn
THYMUS RETICULUM FRAMEWORK - EPITHELIUM
116 Lymph node Afferent lymphatic duct
Lymph node follicle 1. Germinal center 2. Lymphocyte 3. Reticulum cell
116 Lymph node Afferent lymphatic duct Subscapular space
Parafollicular region High endothelial cells of a venule Parafollicular region
ion g e r lar icu foll a r a p High endothelial cells of a venule
INDUCTION OF RESPONSE • PERIPHERAL ORGAN NEEDED TO GET ANTIGEN AND RESPONSIVE CELL TO INTERACT – LYMPHOCYTE RECIRCULATING – APPROPRIATE CONTEXT
19754 Lymphatic sinus in lymph node
Venous sinus Medullary cord Lymphatic sinus or Medullary sinus Lymph node medulla: 1. Reticulum cell 2. Lymphocyte 3. Plasma cell
Lymphatic sinus or Medullary sinus Macrophages in the lymph node m 1. Macrophages
Efferent lymphatic duct? 116
Spleen
218 Spleen (reticulum stain)capsule and reticulum fibers
122 Spleen
122 Spleen red and white pulp
Spleen: 1. Central artery 2. Periarteriolar lymphatic sheath 3. Red pulp
Spleen 122 Marginal zone
central artery PENICILLARY ARTERIES Marginal zone Spleen 122
Splenic red pulp: 1. Venous sinus 2. Littoral cell 3. Billroth’s strand
Spleen reticulum: 1. Reticulum fiber 2. Billroth’s strand 3. Sinuses
117 Litteral cells of spleenic venial Spleen #19752 (UT 117)
Tonsil
419 Tonsil
419 Tonsil
242 Esophagus and trachea, monkey
145 Fundic stomach
153 Large intestine or Colon, monkey
153 Plasma cells large intestine in Colon, monkey
32412
EM 6
Image 112
LIFE CYCLE OF LYMPHOCYTES FETAL ORGANS BONE MARROW PRIMARY LYMPHOID ORGANS (ANTIGEN INDEPENDENT DEVELOPMENT) - THYMUS - T LYMPHOCYTES - BONE MARROW - B LYMPHOCYTES SECONDARY LYMPHOID ORGANS (ANTIGEN DEPENDENT DEVELOPMENT) – LYMPH NODES – LYMPHOID NODULES – SPLEEN
ONTOGENY • STEM CELLS - BONE MARROW • PRIMARY LYMPHOID ORGANS • SECONDARY LYMPHOID ORGANS • DIFFERENTIATION • TO MATURE • ANTIGEN – • REACTIVE CELLS
thymus Bone marrow
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