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Related Concept Videos

The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Hair Cells01:22

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Anatomy of the Ear01:16

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
Two-Way ANOVA01:17

Two-Way ANOVA

The two-way ANOVA is an extension of the one-way ANOVA. It is a statistical test performed on three or more samples categorized by two factors - a row factor and a column factor. Ronald Fischer mentioned it in 1925 in his book 'Statistical Methods for Researchers.'
The two-way ANOVA analysis initially begins by stating the null hypothesis that there is an interaction effect between the two factors of a dataset. This effect can be visualized using line segments formed by joining the means for...

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CT analysis demonstrates that cochlear height does not change with age.

M C Mori1, K W Chang

  • 1Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, California 94305, USA.

AJNR. American Journal of Neuroradiology
|October 1, 2011
PubMed
Summary
This summary is machine-generated.

Cochlear height (CH) measurements in CT scans show no significant change from infancy to adulthood. Males tend to have slightly greater cochlear height than females, with implications for diagnosing inner ear malformations.

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Area of Science:

  • Radiology
  • Otolaryngology
  • Pediatric Imaging

Background:

  • Cochlear height (CH) is a potential indicator for inner ear malformations linked to sensorineural hearing loss (SNHL).
  • Understanding the relationship between CH and age is crucial for accurate diagnosis.

Purpose of the Study:

  • To establish the relationship between cochlear height (CH) and age.
  • To analyze CT images of the temporal bone in patients aged 1 month to 23 years.
  • To determine if CH changes with age, sex, or hearing loss (HL) type.

Main Methods:

  • Coronal CT scans of the temporal bone from 422 ears (211 patients) were analyzed.
  • Multivariate linear regression was used to assess CH in relation to age, sex, and HL type.
  • 11 patients with serial scans were evaluated for CH changes over time.

Main Results:

  • Average CH was 5.3 mm; no statistically significant change was observed with age from 1 month to 23 years.
  • No significant CH differences were found in patients with serial scans.
  • Males exhibited slightly greater CH than females (P < .01).
  • Hypoplastic cochleas (CH < 2 SDs from mean) had an 86% positive predictive value for HL.

Conclusions:

  • Cochlear height (CH) remains stable from infancy through adulthood.
  • Slightly greater CH in males compared to females is noted.
  • CH measurement on CT scans can aid in identifying inner ear anomalies associated with hearing loss.