B. The optic nerve, from before which an external muscle has been cut away, leaving its two attachments.

C. The globe of the eye.

D. The muscle which turns the eye outward, and which is counteracted by a muscle on the other side.

E. The muscle which passes through a loop, or staple of cartilage I, and turns the eye obliquely. It is counteracted by a muscle situated underneath.

F. The muscle situated underneath, which turns the eyeball upwards, and is counteracted by

G. The muscle which turns the eyeball downwards.

H. The muscle attached to a bone which turns the eyeball upwards.

I. The cartilaginous loop through which a muscle passes.

J. The front chamber of the eye filled with a clear fluid.

K. Fragment of the bone by which one of the muscles is fastened.