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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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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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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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Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach 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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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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Updated: Apr 18, 2026

Discovering Middle Ear Anatomy by Transcanal Endoscopic Ear Surgery: A Dissection Manual
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The frog inner ear: picture perfect?

Matthew J Mason1, Johannes M Segenhout, Ariadna Cobo-Cuan

  • 1Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3EG, UK, mjm68@cam.ac.uk.

Journal of the Association for Research in Otolaryngology : JARO
|January 30, 2015
PubMed
Summary
This summary is machine-generated.

Wever's diagram of the frog inner ear is not fully accurate for all anurans. Three-dimensional reconstructions reveal key differences in the auditory system of species like Rana, Eleutherodactylus, and Xenopus.

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Area of Science:

  • Comparative anatomy
  • Auditory system research
  • Herpetology

Background:

  • Wever's (1973) schematic of the leopard frog ear is widely used.
  • The accuracy and representativeness of this diagram for the anuran inner ear are questioned.

Purpose of the Study:

  • To evaluate the anatomical accuracy of Wever's frog inner ear diagram.
  • To compare the inner ear structures of Rana pipiens, Eleutherodactylus limbatus, and Xenopus laevis using 3D reconstructions.

Main Methods:

  • Serial sectioning of frog inner ear specimens.
  • Creation of three-dimensional reconstructions for anatomical analysis.
  • Comparative analysis across three distinct frog species.

Main Results:

  • Rana and Eleutherodactylus possess distinct contact membranes and a "tegmentum vasculosum"; Eleutherodactylus shows tadpole-like proportions.
  • Xenopus laevis lacks these structures and has unique features like a lateral passage and conjoined recesses.
  • Significant anatomical variations exist within the anuran inner ear, challenging the universality of Wever's model.

Conclusions:

  • Wever's diagram is a useful illustration but not a universally accurate representation of the anuran inner ear.
  • The "tegmentum vasculosum" and saccular contact membrane are often overlooked but important structures.
  • Further research into these specific anatomical features is warranted for a comprehensive understanding of frog auditory systems.