Posterior superior alveolar nerve

The posterior superior alveolar branches (posterior superior dental branches) arise from the trunk of the maxillary nerve just before it enters the infraorbital groove; they are generally two in number, but sometimes arise by a single trunk.

Posterior superior alveolar nerve
Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion. (Posterior sup. alveolar labeled at center.)
A sketch of the Posterior Super Nasal Nerve
Details
Innervates	maxillary sinus, molars, dental alveolus
Identifiers
Latin	rami alveolares superiores posteriores nervi maxillaris
TA	A14.2.01.050
FMA	75545
Anatomical terms of neuroanatomy

They descend on the tuberosity of the maxilla and give off several twigs to the gums and neighboring parts of the mucous membrane of the cheek.

They then enter the alveolar canals on the infratemporal surface of the maxilla, and, passing from behind forward in the substance of the bone, communicate with the middle superior alveolar nerve, and give off branches to the lining membrane of the maxillary sinus and gingival and dental branches to each molar tooth from a superior dental plexus; these branches enter the apical foramina at the roots of the teeth.

The posterior superior alveolar nerve innervates the second and third maxillary molars, and two of the three roots of the maxillary first molar (all but the mesiobuccal root). When giving a posterior superior alveolar nerve block, it will anesthetize the mesialbuccal root of the maxillary first molar approximately 72% of the time.