mrcem2-1421

mrcem2-1421

A 12-year-old boy presents with double vision. He is holding his head tilted to the left-hand side. On examination of his eye movements, you note that both eyes can look normally to the right, but on looking to the left, his left eye cannot turn outwards past the midline. The right eye is unaffected when looking to the left.
What is the SINGLE most likely nerve to be involved in this case?