system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The cranial nerve nucleus, supplying the marked muscle with arrow, lies at the level of:
assistant
The correct answer is  The marked muscle is medial rectus, which is supplied by occulomotor nucleus in the midbrain, at the level of superior colliculus. All extraocular muscles are supplied by 3rd cranial nerve (Occulomotor Nerve) except LR6SO4 (Lateral rectus by 6th cranial nerve and Superior Oblique by 4th cranial nerve)