In a nerve examination, “grossly intact” is a broad way of saying that the nerve functions observed appeared to be preserved. The phrase does not show exactly which functions were checked. It is not proof that every nerve function is normal.
A note may describe the cranial nerves, the nerves connecting the brain with parts of the head and body, as “grossly intact”. This wording does not establish that every function of those nerves was tested. More specific examination findings give a clearer picture.
The phrase alone cannot show that every possible problem has been excluded. If you have symptoms that seem at odds with it, ask what was assessed and whether those symptoms were covered by that assessment.

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