Two distinct anatomic patterns of anterior uveal inflammation have been noted in experimental uveitis. One, the exogenous type, appears to follow limbal-trabecular channels and is most frequently characterized by trabecular inflammation. The other, or endogenous type, demonstrates inflammatory cell clusters adjacent to the long ciliary vessels and presents as ciliary body inflammation. Six models of experimental uveitis have been evaluated and classified according to this histologic division. Each model primarily demonstrates exogenous or endogenous distribution.
Aronson SB. Patterns in Experimental Uveitis. Arch Ophthalmol. 1968;79(6):763-767. doi:10.1001/archopht.1968.03850040765020