Which nerve gives off the anterior superior alveolar nerve as it courses anteriorly into the infraorbital canal?

Which nerve gives off the anterior superior alveolar nerve as it courses anteriorly into the infraorbital canal?

• A. Anterior Superior Alveolar (ASA) nerve
• B. Middle Superior Alveolar (MSA) nerve
• C. Posterior Superior Alveolar (PSA) nerve
• D. Infraorbital nerve

Answer: (A)

The anterior superior alveolar nerve is not the source of the branch that supplies the anterior teeth; it is a branch that arises from the infraorbital nerve as the infraorbital nerve travels forward in the infraorbital canal. As the infraorbital nerve moves anteriorly, it gives off the anterior superior alveolar nerve, then continues to the infraorbital foramen to provide sensation to the midface and the maxillary anterior teeth. The other nerves listed either have different roles (posterior superior alveolar with the posterior teeth, or the middle superior alveolar with varied origins) and do not give rise to the ASA. So the nerve doing the giving is the infraorbital nerve.

The anterior superior alveolar nerve is not the source of the branch that supplies the anterior teeth; it is a branch that arises from the infraorbital nerve as the infraorbital nerve travels forward in the infraorbital canal. As the infraorbital nerve moves anteriorly, it gives off the anterior superior alveolar nerve, then continues to the infraorbital foramen to provide sensation to the midface and the maxillary anterior teeth. The other nerves listed either have different roles (posterior superior alveolar with the posterior teeth, or the middle superior alveolar with varied origins) and do not give rise to the ASA. So the nerve doing the giving is the infraorbital nerve.