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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.
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Traumatic hyphaema (blood in the anterior chamber) occurs due to injury to the iris or ciliary body vessels. The circulus iridis major gives off branches to the ciliary processes. Ref:Comprehensive Ophthalmology By AK Khurana, 4th Edition, Page 404
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The correct answer is  Lateral rectus muscle supplied by the abducent nerve is involved in the abduction of the eye. Since the right eye of this patient is turned medially his right lateral rectus muscle and abducent nerve is likely to be damaged. Ref: Comprehensive Ophthalmology By AK Khurana, 4th Edition, Page 313.