The knowledge of the insertion of the eyeball's ext rinsic muscles is of an importance in the surgery and in the forensic medicine. The insertion of the extrinsic muscles of the eyeball in horses can be differentiated from that of mules and donkeys as regards the line of insertion of the dorsal oblique and the mode of insertion of the ven tral oblique muscle. Also the eyeball in equine can be differetiated easily from that of large ruminants, by many several features concerning the insertion of the dorsal, medial and lateral, rectus. The position of the tendon of insertion of the ventral rectus and the charater of ventral oblique muscle insertion into the sclera.