Greg was a world-class diver until he hit his head on the diving board during one of his dives. He now has difficulty coordinating the movements required for various tucks and rotations. It is likely that when he hit his head on the diving board, Greg damaged his .

cerebellum

Explanation:The part of gregs brain that got damaged is the cerebellum (located at the base of the skull where the head meets the neck ). This is because it is the cerebellum that is responsible for motor movement and voluntary actions like balance and coordination required for muscular control and as stated he could not coordinate the necessary movement( voluntary actionns) required for him to dive.

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