Developmental Study of the Round Window Region

Bonaldi, Laís Vieira; Angelis, Marco Antonio De; Smith, Ricardo Luiz

doi:10.1159/000147961

Cited by 13 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A thorough knowledge of anatomical intricacies and variations pertaining the RWN/RWM and surrounding structures is a must to obtain desirable excellency in the surgical results. There are many studies elaborating the anatomical intricacies of the Round Window region [4][5][6][7]. The current study highlights the variable anatomy of RWN/ RWM region as seen from the standard posterior tympanotomy approach and the effects of drilling the RWN overhangs on exposure of the RWM.…”

Section: Introductionmentioning

confidence: 77%

“…The Keyhole-shaped RWN and Semicolon and pear shaped RWM have been described rarely in literature [9]. Well-documented in literature, the human RWN/RWM shapes demonstrate significant inter individual variability [4][5][6]9]. The round window membrane has been described to be saddle like and likened to a chair in view of its non-planar, orthogonal and skewed configuration [5].…”

Section: Discussionmentioning

confidence: 99%

“…The round window membrane has been described to be saddle like and likened to a chair in view of its non-planar, orthogonal and skewed configuration [5]. Bonaldi et al [6] reported the most common shape of RWM to be triangular in shape while in the study by Singla et al [9], the most common shape of RWM was oval. The round window niche has often been described to be triangular or prismatic in shape [7,10].…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Access to Round Window Niche via Posterior Tympanotomy and Impact of Drilling Its Overhangs: A Cadaveric Descriptive Study

Singh

Sagar

Behera

et al. 2018

Indian J Otolaryngol Head Neck Surg

View full text Add to dashboard Cite

We intended to study the morphological parameters of round window region and assess the gain in exposure achieved by drilling the round window niche overhang. The Exposure of the round window membrane (RWM) is of prime importance to carry out atraumatic electrode insertion for cochlear implantation. The anatomy of round window has been a subject of considerable debate in literature. Fifty-one Formalin preserved adult cadaveric temporal bones were micro-dissected to carry out an 'optimal' posterior tympanotomy to expose the round window region. The bony overhangs of round window niche (RWN) were next drilled to achieve maximal possible exposure the RWM without violating the annulus of the same. The exposure was classified as per St Thomas' Hospital classification. The round window could not be visualized in 3 bones (5.9%). The commonest morphology of RWN was dome shaped, found in 18 (37.5%) and that of the RWM was oval shaped, found in 14 (29.2%) bones. Pre drilling 41 bones had a [ 50% exposure of RWM while post drilling [ 50% exposure could be achieved in all the bones except the 3 bones in which RWN could not be visualized to begin with. The drilling of the RWN overhangs exposed RWM in entirety in 91.7% of bones with a visible morphology of RWN pre drilling. RWN and RWM exhibit varied morphology. Drilling of the round window niche overhangs can considerably enhance the exposure of RWM.

show abstract

Section: Introductionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Access to Round Window Niche via Posterior Tympanotomy and Impact of Drilling Its Overhangs: A Cadaveric Descriptive Study

Singh

Sagar

Behera

et al. 2018

Indian J Otolaryngol Head Neck Surg

View full text Add to dashboard Cite

show abstract

“…14 Silicon rubber models provide accurate measures when properly produced and handled. 21 This technique was used to determine the optic canal appearence in adults classified as "hour-glass," cone and cylindrical shaped. 15 One interesting finding concerned symmetry, since the maximum diameter of the right canal orbital opening was slightly greater than that of the left canal in all age groups and this behavior was statistically significant.…”

Section: Discussionmentioning

confidence: 99%

Biometric Study of the Optic Canal during Cranial Development

Prado

Ribeiro

Angelis

et al. 2007

Orbit

View full text Add to dashboard Cite

To study optic canal dimensions and symmetry during cranial development, 146 silicon rubber left- and right-side models of the optic canal were cast from 51 dry skulls and 22 individual bones. The sample was divided in three age groups: fetuses (including newborns), children and adults with ages ranging from seven months of fetal life to 68-year-old. A digital caliper was used to measure the optic canal orbital and cranial diameters as well as model length. Results for the right and the left sides were, respectively, in millimeters: a) Maximum diameter of the orbital opening: fetuses, 4.68/4.47--children, 5.51/5.41--adults, 5.43/5.34; b) Minimum diameter of the orbital opening: fetuses, 2.89/2.84--children, 3.54/3.61--adults, 3.78/3.73; c) Diameter of the cranial opening: fetuses, 3.79/3.76--children, 4.67/4.72--adults, 5.24/5.43; d) Length of the optic canal: fetuses, 3.27/3.05--children, 3.93/3.71--adults 4.94/5.21. The diameter of the cranial opening of the optic canal increases significantly (p < 0.001) during the fetal period and throughout child and adulthood. The greater and smaller orbital apertures increase during the fetal period and during childhood, keeping the same size in adulthood. Optic canal length increases at some point between childhood and adulthood. Concerning symmetry, the only significant difference found was greater right than left optic canal diameter on the orbital side.

show abstract

“…The changes in the shape of the external opening permit growth adaptations of the CA during cranial development. Due to the fact that the inner ear [16] and the round window [17] have definitive dimensions at birth, the CA external opening presents changes in shape and area size.…”

Section: Discussionmentioning

confidence: 99%

The External Opening of the Cochlear Aqueduct in Infants and Adults

Marques

Bonaldi

Angelis

et al. 2001

Otorhinolaryngol Nova

View full text Add to dashboard Cite

Objective: The purpose of the present study is the description of the shape and area of the cochlear aqueduct (CA) opening by means of molds obtained from infant and adult temporal bones. Material and Methods: Through molding techniques the evaluation was performed in 118 temporal bones of infants (5–60 months) and of adults (19–89 years), dimensions and shapes being evaluated through computerized image processing. Results and Conclusions: The data shows that the area of the opening is significantly smaller in children than in adults (7.32 ± 3.32 versus 18.48 ± 6.42 mm²). In infants, in 56% the shape of the opening was triangular; in adults triangularity was 100%. The variability in the shape and size of the CA opening in infants suggests adaptations of the CA opening during cranial growth.

show abstract

Developmental Study of the Round Window Region

Cited by 13 publications

References 0 publications

Access to Round Window Niche via Posterior Tympanotomy and Impact of Drilling Its Overhangs: A Cadaveric Descriptive Study

Access to Round Window Niche via Posterior Tympanotomy and Impact of Drilling Its Overhangs: A Cadaveric Descriptive Study

Biometric Study of the Optic Canal during Cranial Development

The External Opening of the Cochlear Aqueduct in Infants and Adults

Contact Info

Product

Resources

About