Extremely important parts of the body (5,3,4)

'extremely important' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'parts of the body' is the wordplay.
I cannot really understand how this works, but
'parts' could be 'hands' (hand is a kind of part) and 'hands' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?