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Related Concept Videos

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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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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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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Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Equilibrium and Balance01:15

Equilibrium and Balance

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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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Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Related Experiment Video

Updated: Apr 18, 2026

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
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Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve

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A Radiological Study on the Topographical Relationships between the Vestibular, Cochlear and Facial Nerves.

Sacide Unel1, Mehmet Yilmaz2, Sait Albayram3

  • 1Department of Radiology, Haseki Training and Research Hospital, Istanbul, Turkey.

The Eurasian Journal of Medicine
|January 23, 2015
PubMed
Summary

This study mapped the facial and vestibulocochlear nerves in the internal acoustic canal using MRI. Findings reveal their detailed topographical relationships, aiding surgical understanding.

Keywords:
Cochlear nerveFacial nerveMagnetic ResonanceTopographyVestibular nerve

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In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears
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Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits
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Related Experiment Videos

Last Updated: Apr 18, 2026

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
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In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears
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Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits
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Area of Science:

  • Neuroanatomy
  • Medical Imaging
  • Neurosurgery

Background:

  • The internal acoustic canal (IAC) houses critical cranial nerves.
  • Understanding the precise anatomical relationships of these nerves is vital for surgical interventions.

Purpose of the Study:

  • To investigate the topographical relationship between the facial nerve (FN) and vestibulocochlear nerve (VCN) within the IAC.
  • To analyze these relationships in vivo using Magnetic Resonance (MR) imaging.

Main Methods:

  • Utilized three-dimensional gradient echo balanced Fast Field Echo (3D bFFE) MR imaging in 73 healthy subjects.
  • Analyzed IACs from the brainstem to the fundus, recording nerve topography at five levels.
  • Examined relative nerve sizes in the lateral IAC portions.

Main Results:

  • The FN is generally anterior and superior to the VCN.
  • VCN shape varied from rectangular to crescent-shaped near the porus (89%).
  • The inferior vestibular nerve (IVN) was the smallest in 52% of cases; the cochlear nerve (CN) was largest in 36%.

Conclusions:

  • This is the largest in vivo MR study detailing FN and VCN topography.
  • Findings contrast with previous cadaver studies, offering new insights.
  • Knowledge of these topographical relationships can enhance surgical navigation and understanding of neurovascular interactions in the IAC.