Diffuse Lymph Tissue
Nodules

Ileum cross section

muc = mucosa

v = villus

sm = submucosa

me = muscularis externa

Pp = Peyer's patches

Peyer's Patches

ileum

Palatine Tonsil

1 - lymphoid follicle
2 - diffuse lymphoid tissue
3 - crypt
4 - epithelium of the oral cavity musosa (stratified squamous)
6 - submucosa of the inner cover of oral cavity forms
      hemi-capsule of the tonsil

Pharyngeal tonsil

Crypts

Pseudostratfiied columnar epithelium

Septa

Lymph Nodules

Lymph Node

MC = Medullary Cords

MS = Medullary Sinus

Cap = Capsule

CS = Subcapsular Sinus

T = Trabeculae

Lymph Node

1 - cortex
2 - paracortical zone
3 - medulla
4 - medullary cords
5 - lymphoid follicle of the cortex
6 - capsule

Lymph Node

1 - cortex
2 - paracortical zone
3 - medulla
4 - medullary cords
5 - lymphoid follicle of the cortex
6 - capsule
7 - subcapsular sinus
8 - cortical sinus
9 - medullary sinus

Lymph Node

Aff - afferent lymphatic vessel
Cap - capsule
GC - germinal center
LN - lymphatic nodule
Ma - mantle (corona)
Sub - subcapsular sinus
Va - valve

Lymph Node

RC - reticular cells
green arrowhead - dividing lymphocyte

Lymph Node

C - cortex
M - medulla
Pa - paracortex

Lymph Node

Trabeculae

Trabecular Sinus

Littoral Cells

Lymph Nodes

reticular cells

Lymph Node

High Endothelial Post Capillary Venule

(in paracortex)

Lymph Nodule

Germinal Center surrounded by Mantle Zone surrounded by paracortex (area around entire nodule)

B-lymphoblasts are in the germinal centers

B-lymphocytes are in the mantle

T-lymphocytes are in the paracortex around the nodule

Primary follicles don't have germinal center

Secondary follicles have germinal centers