Choose the incorrect statement:
The entrance of the mouth is guarded by the labia
The mouth opens internally to a narrow space called vestibule and a wide space called the oral cavity.
Uvula cuts off the upper nasal part of the pharynx from the oral part of the pharynx during swallowing
The mucosa of the buccal cavity is made up of simple squamous epithelium
The mucosa of the buccal cavity is made up of stratified squamous epithelium. Hence, the correct answer is option d.