Dorsal wall

The dorsal wall of the orbit or roof of the orbit (Paries dorsalis), regularly concave, belongs to the frontal bone; it shows:

a) the shalow fossa of the lacrymal gland (Fossa glandulae lacrimalis), at the basis of the zygomatic process of the frontal bone;

b) the opening of the supraorbital foramen or supraorbital duct (Canalis supraorbitalis);

c) medially, the trochlear fovea (Fovea trochlearis), that receives on the living animal the reflexive ring of the dorsal oblique muscle of the eye.