You're looking at a snowclone.
(where X and Y are suitable nouns/NPs, and 'he' can be a noun, 'she', 'it' or with verb adjustment 'I', 'you' or more rarely 'they').
The articles are respectively always 'the', and almost always 'a/an' though this may be replaced by the zero article if the second N/NP is plural.
'Mind' may be the original noun X, though 'body' is a close contender.
- "My brother has the mind of a scientist or a philosopher and yet he elects to be a detective." ['Sherlock'].
- 'This guy has the mind of an 11-year-old.'
- 'She has the body of an angel.'
Individual body parts for X in examples showing a closer relationship are rather unusual, though expressions like
- You have your mother's eyes, Harry.'
are of course common. But note that here 'inherited' rather than 'of a type / standard that is usually associated with' is the stronger semantic relation.
Used – let's say morefiguratively – this restriction is less binding:
- "I have the eyes of a hawk and the ears of a fox." [Gimli; The Fellowship of the Ring; Tolkien; film adaptation]
But 'I have the leg of a footballer' sounds unusual. 'He has the legs of a fellwalker' seems perhaps more suitable. The comparator is perhaps more likely, and most people have two legs – and while using a single example ('She has a good eye for a bargain') to refer to a plurality is common, novel examples ('the finger of a pianist'; 'the leg of a footballer') don't sound natural.