buccal cavity

buccal (“of or pertaining to the cheek or mouth”) + cavity (“hollow area”)

buccal cavity (plural buccal cavities)

1. (of an animal) The oral cavity, bound by the cheeks of the face, the palate, and the flesh of the mandible, opening onto the mouth and the fauces, and containing the teeth, tongue, gums, and other structures.
2. (of an insect) The first part of the stomodaeum, lying just within the mouth; its dilator muscles arising on the clypeus, and inserted before the frontal ganglion and its connectives.

• This phrase is sometimes misconstructed as buckle cavity.

• mouth (in non-technical usage)
• oral cavity