Buccal nerve
The buccal nerve (long buccal nerve) is a sensory nerve of the face arising from the mandibular nerve (CN V3) (which is itself a branch of the trigeminal nerve). It conveys sensory information from the skin of the cheek, and parts of the oral mucosa, periodontium, and gingiva. Structure

Origin 
The buccal nerve is a branch of the anterior division of the mandibular nerve (CN V3). It is the only sensory branch of the anterior division. Course and relations 
After branching from the anterior trunk of the mandibular nerve (CN V3), the buccal nerve passes between the two heads of the lateral pterygoid muscle, underneath the tendon of the temporalis muscle. It then passes anterior to the ramus of the mandible to first course deep to the masseter muscle, and finally anteroinferiorly upon surface of the buccinator muscle before piercing this muscle. Communications 
It connects with the buccal branches of the facial nerve on the surface of the buccinator muscle. It gives off many significant branches. Distribution 
The buccal nerve provides sensory innervation to the skin of the cheek, the buccal mucosa, buccal periodontium, and gingiva of mandibular/lower molar and second premolar teeth (until the mental foramen). It also issues proprioceptive fibres into the buccinator muscle. Clinical significance

Anesthesia 
Buccal nerve block (long buccal nerve block) is indicated for procedures involving the mucosa adjacent to the posterior molar teeth, such as the placement of a rubber dam clamp. The injection site is distal and buccal to the third molar, with the needle penetrating 1-2mm as the nerve lies directly below the mucosa. A buccal nerve block is carried out after an inferior alveolar nerve block  for specific procedures, such as extraction of mandibular molar teeth. Surgical damage 
The buccal nerve may be damaged by surgical incisions near the external oblique ridge of the mandible. Additional images

References 
 "Nerve, buccal." Stedman's Medical Dictionary, 27th ed. (2000). Gray's Anatomy: The Anatomical Basis of Clinical Practice. (2005). Specific

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Mandibular nerve