The subarcuate canaliculus and its artery - a radioanatomical study
ABSTRACT The anatomy of the subarcuate canaliculus (SAC), subarcuate fossa (SAF) and subarcuate artery (SAA) was studied in 12 cadavers and 35 dry temporal bones. Each cadaver was scanned with high resolution CT (HRCT) prior to microdissection. The SAC was always found to be a single canal located between the 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 SAC. The SAC was on average of 9.2 mm in length and 1 mm in width. The SAF was situated at a distance of 4.2 mm from the internal acoustic meatus, 3.5 mm from the groove for the superior petrosal sinus, 6.7 mm 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 the 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 artery. This study investigated CT correlated anatomical aspects of the subarcuate canaliculus and its artery which is claimed to be responsible for the blood supply of the mastoid antrum, facial canal and bony labyrinth.
SourceAvailable from: Paul M Parizel[Show abstract] [Hide abstract]
ABSTRACT: OBJECTIVE: The adult petromastoid canal (PMC) is a thin anatomical structure, but in young children, it can be wide on high resolution CT (HRCT) scans. We performed this study to evaluate the year-by-year change in width and shape of the PMC in the young child. MATERIALS AND METHODS: We retrospectively reviewed temporal bone HRCT scans, performed between 2007 and 2012. Eighty children were included (age range: 0.3-6.9 years; median age: 3.1 years; 56% male). All scans had a slice thickness of ≤1mm. RESULTS: The average width of the PMC was 1.95mm in children <2 years, compared to 0.83mm in children ≥2 (p<0.001). We categorized the PMC into 4 subtypes. A bulky (type III) PMC was predominant <2 years. A thin curvilinear (type I) PMC was more prevalent in the older children. Type II and IV PMC were found infrequently. The PMC width correlated inversely with the degree of pericapsular ossification (p<0.001), and mastoid pneumatisation (p<0.001). CONCLUSION: A wide PMC (≥1mm) is a common finding in children <2 years. As children grow older, the PMC progressively narrows. This correlates to increased temporal bone pneumatisation and ossification of the otic capsule.International journal of pediatric otorhinolaryngology 03/2013; DOI:10.1016/j.ijporl.2013.02.015 · 1.32 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: PurposeTo characterize the MRI features of the petromastoid canal in children with sensorineural hearing loss (SNHL) and in normal infants.Materials and Methods High resolution MRI examinations of 564 children who were evaluated for SNHL and brain MRI examinations of 112 infants who had normal studies were studied independently by two reviewers.ResultsIn SNHL group, visibility of the PMC decreased for right and left PMC (P < 0.001). The width of the right PMC significantly decreased as age increased (P < 0.0001). There was no relation between abnormalities of membranous labyrinth and cochlear nerve and PMC visibility in children with SNHL (p > 0.05). In the normal group, the PMC visibility decreased with increasing age (right P = 0.0001, left P = 0.001). In the normal group also, as age increased, the PMC width decreased for both PMCs (right, P = 0.0006; left, P = 0.03).Conclusion The PMC is more frequently visualized in young children. Its visibility and width are not associated with abnormalities of membranous labyrinth and cochlear nerves. J. Magn. Reson. Imaging 2014;39:966–971. © 2013 Wiley Periodicals, Inc.Journal of Magnetic Resonance Imaging 04/2014; 39(4). DOI:10.1002/jmri.24236 · 2.79 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: We examined the anatomic features of the top of the superior semicircular canal (SSC) to help guide the surgeon considering resurfacing or plugging of an associated dehiscence, thorough the transmastoid (TM) approach. 19 selected cadaveric temporal bones, which had no supralabyrinthine tract, were dissected, and distances between the SSC and various structures within the temporal bone were measured with a, fine caliper. The average distances from the sino-dural angle, horizontal canal top, and subacurate artery, to the top of the SSC were 31.1, 7.8, and 3.9mm, within a small range. 7 (36.8%) out of 19 bones with a, low hanging tegmen needed a wide exposure and elevation of the dura to access the SSC top. Knowledge of the anatomical details associated with the SSC from this study may help to, access the SCC dehiscence safely for resurfacing surgery via a TM approach.Auris, nasus, larynx 10/2013; 41(2). DOI:10.1016/j.anl.2013.08.006 · 1.00 Impact Factor