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Related Concept Videos

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.
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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

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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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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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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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Auditory Perception01:17

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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 mental ossicles: A narrative review.

S K Htike1, N Kitagawa1, K Fukino1

  • 1Department of Oral and Maxillofacial Anatomy, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan.

Morphologie : Bulletin De L'Association Des Anatomistes
|July 20, 2025
PubMed
Summary
This summary is machine-generated.

The rare mental ossicles, crucial for fetal chin development, are anatomical structures in infants that typically disappear before birth. This review explores their occurrence and characteristics.

Keywords:
CartilageChinMandibleMental ossiclesOssificationPrenatal structures

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Area of Science:

  • Anatomy
  • Embryology
  • Craniofacial Development

Background:

  • Mental ossicles (ossicula mentalia) are midline structures between mandibular halves in infants.
  • They appear early in gestation (6-7 weeks) and usually disappear by birth.
  • Despite their role in chin formation, they are infrequently documented in scientific literature.

Purpose of the Study:

  • To review the literature on mental ossicles.
  • To discuss their occurrence, anatomical, embryological, and histological features.
  • To highlight their importance in mandibular and craniofacial development.

Main Methods:

  • Searched PubMed and Google Scholar databases.
  • Utilized search terms: "mental ossicles", "ossicula mentalia", "mental bones".
  • Conducted backward citation tracking and full-text review.

Main Results:

  • The review synthesizes existing knowledge on mental ossicles.
  • Details on their developmental timeline and anatomical variations are discussed.
  • Their significance in fetal development is emphasized.

Conclusions:

  • Understanding mental ossicles is vital for comprehending normal mandibular development.
  • Knowledge of these structures aids in assessing craniofacial symmetry.
  • Further research may elucidate their precise role and clinical relevance.