The Atomic Brain, aka. Monstrosity

The Atomic Brain (1964) starring Erika Peters, Judy Bamber
Hetty March, a rich but unscrupulous old woman, employs a mad scientist to swap her brain into a nubile younger body. Animal men, zombie women and evil cats are the inevitable result in this bizarre B-Movie concoction, the only directorial effort from Joseph V. Mascelli (author of "The 5 C's of Cinematography").