Buccal cells, which are cells found in the lining of the mouth (the cheek), are flat, thin, and irregular in shape. They are typically polygonal, meaning they have many sides, and often have a slightly elongated shape.

Here's a breakdown of their appearance:

* Size: They are relatively small, around 20-30 micrometers in diameter.

* Shape: They are flat and thin, with an irregular shape that can be polygonal, oval, or elongated.

* Nucleus: They have a prominent, centrally located nucleus that is typically round or oval.

* Cytoplasm: The cytoplasm is clear and contains few organelles, including mitochondria, ribosomes, and Golgi apparatus.

* Cell membrane: The cell membrane is thin and delicate.

Note: Under a microscope, buccal cells appear as translucent, flat cells with a distinct nucleus. They are easily identifiable because of their characteristic shape and lack of specialized structures.