The Buccal nerve is a long-running nerve in the face. It is between the second and third molars and basically runs down the cheek. It transmits feelings from the skin of the cheek and also the mouth.

Cranial Nerve 5 (trigeminal), division V3 contains a buccal nerve, a lingual nerve and an inferior alveolar nerve.

The greater palatine nerve block can be performed intraorally. The needle is inserted either through the palatal mucosa midway between the second and third molar or through the buccal mucosa posterior to the maxillary second molar. The injection site is usually located near the greater palatine foramen.

These words had to be defined before the question could be answered. So, defining the two terms: "Buccal" means "mouth" and "ganglia" is the plural of "ganglion" which is "a group of nerve cells" that is sort of a "sub" brain. So... the buccal ganglia are a two (one on each side) ganglia located under the back of a snail's mouth. They control the eating movements of the creature.

When a nerve block is used, a substance that deadens the nerves is injected into the body. This may cause some pain or discomfort.