A rare variation of superior rectus muscle

The extraocular muscles are responsible for all eye movements required to track and fix objects. Superior rectus muscle is located in the superior level of orbital cavity, below musculus levator palpebrae superioris , tilted slightly lateral part orbit. In a routine dissection, we found left, unilateral variation with no other structures, such as nerves vessels. abnormal presented two parts - medial ones. bifurcated into heads different insertion points. It case rare muscles, which, our knowledge, has not yet been reported.