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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