Lymphatic Systems

The Thymus

Low mag of the thymus

Cortex (C)

Medull

a

(M) CC

M

M

Dark nuclei = T-cells

Larger nuclei =

endothelial reticular

cells

Arrow = Hassell’s Corpuscle

High mag of the medulla of the thymus

Lymphatic Systems

Lymph Nodes

Diagram of a lymph node

Low mag of a lymph node

Cx = cortex w/ lymphatic nodules (F); M = medulla; C = CT capsule

A lymphatic nodule with germinal center (GC)

Lymphatic Systems

Non-encapsulated Lymphatic Nodules

Peyers Patches = lymphatic nodules in the ileum

Low mag of a palatine or lingual tonsil

Palatine Tonsil w/ SS non-K (arrow)

Pharyngeal Tonsil w/ Resp epith (arrow = nodule)

Lymphatic Systems

The Spleen

Diagram of the Spleen

White pulp (lymphatic nodules)

Thick CT capsule

CT Trabeculae

Red Pulp

CT Trabeculae

Low magnification of the Spleen

CT Trabeculae

Lymphatic nodules

White pulpRed Pulp

Circulatory System in the Spleen

White Pulp

White Pulp

Red Pulp

Red Pulp

High mag of the splenic red pulp

SEM of the endothelial cells of the sinusoids