Five Muscles of floor of the mouth :

Mylohyoid :

From mylohyoid line to hyoid bone 

Anterior belly of digastric :

From digastric fossa to hyoid bone 

Posterior belly of digastric :

from Mastoid notch to hyoid bone

Stylohyoid :

From styloid process to hyoid bone 

Geniohyoid :

From inferior genial tubercle to hyoid bone 

Let's see and learn on anatomical images.

With mnemonics to remember them and not to forget.