Moreover, occasionally, the posterior superior alveolar
nerve block may not cause complete maxillary molar
anaesthesia due to the presence of branches from the palatine
nerve that could innervate the molar and premolar teeth.
33
In this case, the greater palatine nerve block could be associated
to the posterior superior alveolar nerve block to enhance the
anaesthetic effects. Alternative to the greater palatine nerve
block could be plexus anaesthetic injection on the palatal
aspect.
3.1.2.2. The middle superior alveolar nerve. The middle super-
ior alveolar nerve is given off from the infraorbital nerve,
during its course in the infraorbital canal, and runs in the
lateral wall of the maxillary sinus to supply the premolar
teeth (Fig. 5).