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Posterior superior alveolar nerve

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Nerve: Posterior superior alveolar nerve
Gray778
Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion. (Posterior sup. alveolar labeled at center.)
[[Image:|250px|center|]]
Latin rami alveolares superiores posteriores nervi maxillaris
Gray's subject #200 890
Innervates maxillary sinus, molars, dental alveolus
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MeSH [1]

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.

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 posterior 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 three twigs to each molar tooth; these twigs enter the foramina at the apices of the roots of the teeth.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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