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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

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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...
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Equilibrium and Balance01:15

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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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The Vestibular System01:29

The Vestibular System

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The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.
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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
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The Cochlea01:13

The Cochlea

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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.
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Related Experiment Video

Updated: Sep 19, 2025

Gene Transfer to the Developing Mouse Inner Ear by In Vivo Electroporation
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Position and Dimension of the Inner Ear in Midterm Fetuses.

Derya Ümit Talas1, Ecenur Işık2, Ayşenur Tatlı3

  • 1Department of Otolaryngology, Mersin University Faculty of Medicine, Mersin, Türkiye.

The Journal of International Advanced Otology
|June 16, 2025
PubMed
Summary

The inner ear (IE) grows slower than the petrous bone, causing the IE's relative area within the petrous bone to decrease with fetal development. Semicircular canals reach adult size early in development.

Keywords:
Cochleafetusinner earlateral semicircular canalpetrous boneposterior semicircular canalsuperior semicircular canal

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Area of Science:

  • Anatomy
  • Developmental Biology
  • Otolaryngology

Background:

  • Investigating the developmental relationship between the inner ear (IE) and the surrounding petrous bone is crucial for understanding fetal ear development.
  • Previous research has not fully detailed the proportional growth dynamics of these structures during gestation.

Purpose of the Study:

  • To quantify changes in the inner ear's area within the petrous bone relative to gestational age.
  • To determine the growth patterns of key inner ear structures, including the cochlea and semicircular canals.

Main Methods:

  • Analysis of 20 temporal bones from 10 fetal cadavers (23.50 ± 2.94 weeks gestation).
  • Measurement of specific anatomical landmarks: petrous ridge length (PRL), inner ear length (IEL), cochlear bone thickness, and distances related to semicircular canals and petrous ridge borders.

Main Results:

  • The ratio of inner ear length to petrous ridge length (IEL/PRL) decreased with increasing gestational age.
  • Inner ear structures grow proportionally slower than the petrous bone, leading to a reduced relative IE area over time.
  • While cochlear size and semicircular canal angles did not correlate with gestational age, semicircular canal dimensions reached adult size between 21-24 weeks gestation.

Conclusions:

  • The findings highlight a differential growth rate between the inner ear and petrous bone, impacting their spatial relationship during fetal development.
  • The established quantitative data provides a foundation for prenatal radiological assessments related to inner ear development.
  • This information may assist otologists in understanding the anatomical context of the developing inner ear.