Internal Auditory Canal: Pre- and Postnatal Growth

Bonaldi, Laís Vieira; Lago, A.; Crema, Luciana; Fukuda, Yotaka; Smith, Ricardo Luiz

doi:10.2310/7070.2004.02006

Cited by 16 publications

(14 citation statements)

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“…Typical ear-canal diameters for a 1-monthold infant and an adult are 4.4mm and 8mm, respectively (Keefe et at, 1993). The length of the ear canal increases with age (Bonaldi, do Lago, Crema, Fukuda, & Smith, 2004). The orientation of the tympanic membrane also changes with age and does not become aduitlike until approximately three years of age (Eby & Nadol, 1986;lkui, Sando, Sudo, & Fujita, 1997).…”

Section: Maturation Of the Auditoiy Systemmentioning

confidence: 99%

The Efficiency of the Single- Versus Multiple-Stimulus Auditory Steady State Responses in Infants

Hatton

Stapells

2011

Ear &Amp; Hearing

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The amplitude reductions seen in the multiple-stimulus conditions in infants, not seen in adults, could be related to maturational differences in the ear canal, middle ear, cochlea, and/or brain stem. Because greater interactions occur in the DM-stimulus condition compared with the monotic multiple-stimulus condition and baseline single-stimulus condition, brain stem origins of these interactions are likely. Study B revealed statistically nonsignificant differences between threshold for 500 Hz when presented in the single- and DM-stimulus conditions. In summary, as with adults, multiple-stimulus presentation in infants is more efficient than single AM tones, at least for 60 dB SPL stimuli.

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Section: Maturation Of the Auditoiy Systemmentioning

confidence: 99%

The Efficiency of the Single- Versus Multiple-Stimulus Auditory Steady State Responses in Infants

Hatton

Stapells

2011

Ear &Amp; Hearing

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“…9 Additionally, the IAC is outside the otic capsule, and therefore the correlation between its length and the age of the patient does not violate current dogma. 15 A recent study by Chen et al 8 indicated no statistically different measurements of the inner ear between children with and without SNHL. The average LSCC bony island width in our data is consistent with that presented in the Chen article (Table 2.).…”

Section: Discussionmentioning

confidence: 93%

Enlarged Vestibular Aqueduct in Pediatric SNHL

Dewan¹,

Lieu²

2008

Otolaryngol.--head neck surg.

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Objective-Comparison of the Cincinnati criteria (midpoint >0.9 mm or operculum >1.9 mm) to the Valvassori criterion (midpoint ≥ 1.5 mm) for enlarged vestibular aqueduct (EVA) in pediatric cochlear implant patients. Study Design-Cohort study Subjects-130 Pediatric cochlear implant recipients.Methods-We reviewed temporal bone CT scans to measure the vestibular aqueduct midpoint and opercular width.Results-The Cincinnati criteria identified 44% of patients with EVA versus 16% with the Valvassori criterion (P<0.01). Of those with EVA, 45% were unilateral and 55% were bilateral using Cincinnati criteria; 64% were unilateral and 36% bilateral using Valvassori criterion (P<0.01). The Cincinnati criteria diagnosed 70 ears with EVA classified as normal using the Valvassori criterion (P<0.01);59 lacked another medical explanation for their hearing loss. Conclusion-TheCincinnati criteria identified a large percentage of pediatric cochlear implant patients with EVA who might otherwise have no known etiology for their deafness.

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“…Some authors hold that absence of the vestibulocochlear nerve causes IAM aplasia or stenosis, while others believe that nerve development precedes cartilage development [ 15 ]. IAM stenosis could occur at various anatomical sites according to the stage of embryonic or childhood development, and could be most severe when there are concurrent severe inner ear malformations [ 16 ]. In our study, multiple concurrent inner ear malformations were found in 36 patients.…”

Section: Discussionmentioning

confidence: 99%

Restudy of malformations of the internal auditory meatus, cochlear nerve canal and cochlear nerve

Yang

Liu

et al. 2014

Eur Arch Otorhinolaryngol

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The present study aims to restudy the correlation between the internal auditory meatus (IAM), the cochlear nerve canal (CNC), the cochlear nerve (CN) and inner ear malformations. In this retrospective study design, the abnormal diameter of the IAM, CNC and CN in patients with any kind of inner ear malformations was evaluated using multi-slice spiral computed tomography (MSCT) (37 patients) and magnetic resonance imaging (MRI) (18 patients). Of 37 MSCT-diagnosed patients, 2 had IAM atresia, 11 IAM stenosis, 22 enlarged IAM, and 2 normal IAM with an abnormal CN. MRI diagnoses of 18 patients revealed 8 cases of aplastic CN, 6 hypoplastic CN, and 4 normal CN. CNC stenosis was associated with CN hypoplasia (P < 0.001). Patients with absent or stenotic IAM had less CN development than those with normal or enlarged IAM (P = 0.001). We propose a modification of the existing classification systems with a view to distinguishing malformations of the IAM, CNC and CN.

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Internal Auditory Canal: Pre- and Postnatal Growth

Cited by 16 publications

References 0 publications

The Efficiency of the Single- Versus Multiple-Stimulus Auditory Steady State Responses in Infants

The Efficiency of the Single- Versus Multiple-Stimulus Auditory Steady State Responses in Infants

Enlarged Vestibular Aqueduct in Pediatric SNHL

Restudy of malformations of the internal auditory meatus, cochlear nerve canal and cochlear nerve

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