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.
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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; · 0.85 Impact Factor
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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; · 0.58 Impact Factor
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ABSTRACT: OBJECTIVE: The objective of this article is to discuss and illustrate commonly visualized fissures and sutures in the temporal bone. This topic is important because a thorough knowledge of normal anatomy is necessary to avoid misinterpretation as fractures. CONCLUSION: Small normal anatomic fissures are now routinely visualized with the increasing use of MDCT in trauma patients. An awareness of these structures is required by radiologists interpreting studies with fine temporal bone slices to prevent erroneous interpretation.American Journal of Roentgenology 08/2012; 199(2):428-34. · 2.90 Impact Factor