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Bursa of Fabricius

cortex (pars lymphoreticularis) of the folllicle
medulla (pars lymphoepithelialis) of the follicle
intrafollicular capillary layer
cortico-medullary epithelium
follicular associated epithelium
interfollicular surface epithelium

Follicle of the bursa of Fabricius of a chicken (HE) (2)

The cortex and medulla are separated by a network of large capillaries and lymphatic vessels. At the medullar side, a layer of undifferentiated epithelial cells, the cortico-medullary epithelium, lies against the capillaries and continues up to the surface epithelium. The basal lamina of the cortico-medullary epithelium continues as the basal lamina of the interfollicular epithelium.