It is formed by the expansion of the optic nerve on the inner surface of the choroid, and, like that coat, it is bell-shaped.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The ciliary processes form a fringe around the slightly inverted rim of the choroid.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The choroid coat is a bell-shaped, dark membrane which lines the sclerotic.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler