Lymphoid tissue 1 Flashcards
Bone marrow and thymus
primary lymphoid organs
Locations where the immune responses occur
secondary lymphoid organs. Tonsils, lymph nodes, spleen
prenatal, do not possess a germinal center. Consist of only small lymphocytes
primary nodule
more frequent than primary nodules, posses a germinal center which stains lighter than outer portion. clusters of lymphoblasts in germinal center
secondary nodule
What do Primary Lymphoid organs produce?
Cellular components of Immune System
Two types of Non-Encapsulated Lymphoid Tissue
Diffuse and Nodular
Two Classifications of Lymphoid tissue
Non-Encapsulated and Encapsulated
Diffuse tissue characteristics
no capsule
scattered lymphoid cells
deep to the epithelium in connective tissue
Where is Diffuse tissue located
gastrointestinal tract, genitourinary tract, respiratory tract
deep to epithelium in connective tissue
Two types of Nodular tissue
Single and Aggregate
Two types of Single Nodular Non Encapsulated Lymphoid Tissue
Primary and Secondary
Primary Single Nodular Characteristics
less frequent then Secondary
small lymphocytes
prenatal
no germinal center
Secondary Single Nodular Characteristics
MORE frequent than Primary
germinal center which stains slightly lighter
germinal center contains lymphoblast clusters
Outer ring or mantle zone (smaller lymphocytes)
memory cells collect in outer ring
3 types of Aggregate Nodular Non-Encapsulated Tissue
Tonsils
Peyer’s Patch
Vermiform Appendix
3 Types of Tonsils
Pharyngeal
Palatine
Lingual
Pharyngeal Tonsil
pseudostratified columnal epithelium ciliated germinal center 1/person no crypts thin partial capsule posterior of nasopharynx
Tonsil general characteristics
partially encapsulated aggregates of lymphoid nodular tissue
deep to mucosa of nasopharynx, oral cavity and oropharynx
lymphocytes infiltrate epithelium
Palatine Tonsil
non-keratinized stratified squamous thick partial capsule 2/person germinal centers 10-20 crypts lateral walls of oral cavity
Lingual Tonsil
stratified squamous no definitive capsule small and numerous/person germinal centers one crypt posterior third of tongue
Mucosa-Associated Lymphoid tissue
MALT
single or clusters of lymphoid nodules
gastointestinal tract, respiratory pathways, urinary tract
Gut Associated Lymphoid Tissue
GALT
GALT in Ileum lots of villi Crypts single or clusters of lymphoid nodules simple columnar w/ goblet cells
Peyer’s Patches
GALT No Vili Crypts simple columnat epithelium Goblet Cells
Vermiform Appendix
