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Related Concept Videos

Anatomy of the Ear01:16

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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 Cochlea01:13

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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: Jul 2, 2025

Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve
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Cochlear aqueduct revisited: A histological study using human fetuses.

Kwang Ho Cho1, Ji Hyun Kim2, Yohei Honkura3

  • 1Department of Neurology, Wonkwang University School of Medicine and Hospital, Institute of Wonkwang Medical Science, Iksan, Republic of Korea.

Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
|February 28, 2024
PubMed
Summary

The cochlear aqueduct (CA) develops from meningeal tissues, with cavitation originating from the scala tympani, not the CA anlage. Cochlear vein development follows a separate pathway from the CA.

Keywords:
CavitationCochlear aqueductCochlear veinHuman fetusesPerilymphatic spaceScala tympaniSubarachnoid space

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Area of Science:

  • Anatomy
  • Embryology
  • Otolaryngology

Background:

  • The cochlear aqueduct (CA) connects the cochlea's perilymphatic space to the posterior cranial fossa's subarachnoid space.
  • Understanding CA development is crucial for inner ear research.

Purpose of the Study:

  • To determine if CA cavitation occurs on the subarachnoid or cochlear side.
  • To investigate the growth and degeneration patterns of the CA and its associated vein during human fetal development.

Main Methods:

  • Histological examination of paraffin-embedded human fetal sections.
  • Study included 15 midterm fetuses (CRL 39-115 mm) and 12 near-term fetuses (CRL 225-328 mm).

Main Results:

  • A mesenchymal condensation, potential CA anlage, appeared without a vein at 9-10 weeks.
  • Subarachnoid protrusion into the CA anlage initiated scala tympani cavitation around 10-12 weeks.
  • The CA anlage itself did not cavitate; the CA narrowed and obliterated in near-term fetuses.

Conclusions:

  • The CA originates from meningeal tissues, with cavitation driven by scala development.
  • The CA anlage may represent a remnant of the glossopharyngeal nerve branch.
  • Cochlear vein development appears independent of CA formation.