The heart is 'le coeur' in French. The brain is 'le cerveau'.
mon coeur means my heart in French.
In French heart surgeon is: chirurgien de coeur.
le cerveau
A smiling heart would be "un coeur souriant" in French.
mon coeur.
Un cœur
little heart is translated 'petit cœur' in French.
French: Coeur
Tu as mon coeur
coeur noir
"coeur rebelle"
cœur d'or