Before plastination and the "show" of anatomy for public audiences,early 18th/19th century educationalist produced images with dissected muscles. There is an excellant example of extensor digitorum brevis at the front of his left foot!
Florence, 1833. Overprinted and hand colored copperplate engraving.
Anatomist:Paolo Mascagni (1755-1815)
Artist:Antonio Serantoni (1780-1837)
Picture Source:National Library of Medicine.