The buccal branch is a small nerve that is part of the facial nerve (cranial nerve VII). It primarily supplies sensation to the skin and mucous membranes of the cheek area. This branch plays a crucial role in the sensory perception of the buccal cavity, which includes the inner lining of the cheeks. In addition to sensory functions, the buccal branch also innervates some muscles involved in facial expressions. It helps control movements such as smiling and frowning, contributing to non-verbal communication. Understanding the buccal branch is important in fields like dentistry and facial surgery.