The subarcuate canaliculus and its artery - a radioanatomical study

The anatomy of the subarcuate canaliculus (SAC), subarcuate fossa (SAF) and subarcuate artery (SAA) was studied in 12 cadavers and 35 dry temporal bon es. Each cadaver was scanned with high resolution CT (HRCT) prior to microd issection. The SAC was always found to be a single canal located between th e two arcs of the anterior semicircular canal in both microdissections and HRCT scans and the internal acoustic meatus was observed to be located just inferior to the SAG. The SAC was on average of 9.2 mm in length and 1 mm i n width. The SAF was situated at a distance of 4.2 mm from the internal aco ustic meatus, 3.5 mm from the groove for the superior petrosal sinus, 6.7 m m from the opening of the vestibular canaliculus and 11.5 mm from the most superior part of the jugular foramen. The SAA was found to originate from t he anterior inferior cerebellar artery in 9 cadavers and from the internal auditory artery in 3 cadavers. The SAA always emerged from the main artery outside the internal acoustic meatus. It ran through the SAC as a single ar tery. This study investigated CT correlated anatomical aspects of the subar cuate canaliculus and its artery which is claimed to be responsible for the blood supply of the mastoid antrum, facial canal and bony labyrinth.