Lymphatic Tissue
Lymphoid Tissue
courtesy M. O'Keefe, MSI, 2008
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PHARYNGEAL TONSIL
Pseudostratified columnar epithelium
[pic]
PALATINE TONSIL Stratified squamous epithelium
[pic]
APPENDIX –
no villi
[pic]
SPLEEN
Presence of red and white pulp; trabeculae extend from capsule into parenchyma
[pic]
THYMUS –
Lobular shape with visible cortex and medulla in each lobule; Hassall’s corpuscles;
no discernable lymph nodules
[pic]
LYMPH NODES
Small organs; distinct cortex and medullary regions
[pic]
ILEUM –
villi present, Peyer’s Patches
[pic]
No external nor internal
epithelial surfaces
TONSIL -- with epithelium
lining crypts as well as exterior
Lobules present;
capsule subdivides parenchyma
No lumen present
Lumen present
MALT -- Mucosa Associated Lymphoid Tissue
GALT -- Gut-Associated, with luminal epithelium clearly evident
Simple capsule
around organ,
no lobules
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