The lens is slung in a ligament that is a part of the “ciliary body,”
which is a continuation of the choroid coat of the eyeball. This ciliary
body is a ring of tissue lying behind the iris connected with the
anterior portion of the choroid coat of the eye.
Between the iris and the underlying lens on the one hand and the inner
surface of the bulging cornea on the other is a small space or cavity
filled with a clear transparent fluid called the _aqueous humor_.