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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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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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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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Updated: Jul 5, 2025

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration
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Symmetrically dotted tympanic membranes.

Christopher Seifen1, Kai Helling1

  • 1Department of Otolaryngology, Head and Neck Surgery University Medical Center Mainz Mainz Germany.

Clinical Case Reports
|January 15, 2024
PubMed
Summary
This summary is machine-generated.

This study reports a rare case of unexplained black dots on the tympanic membranes in a 61-year-old patient. These harmless findings highlight the importance of excluding underlying pathologies when observing tympanic membrane discoloration.

Keywords:
hemorrhageincidentalotomycosisotoscopytympanic membrane

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Area of Science:

  • Otolaryngology
  • Anatomy
  • Medical Imaging

Background:

  • Color changes of the tympanic membrane, excluding inflammation or perforation, are infrequently documented.
  • Potential causes include barotrauma-induced hemorrhage, spontaneous bleeding, or otomycosis.

Observation:

  • A case study involving a 61-year-old patient presented with incidental, symmetrically located black dots.
  • These were observed in the antero-inferior quadrant of both tympanic membranes.

Findings:

  • The observed black dots on the tympanic membranes were determined to be a previously undocumented anatomical rarity.
  • No underlying pathology was identified as the cause of this discoloration.

Implications:

  • This case underscores the necessity of thorough evaluation to rule out significant pathologies when tympanic membrane discoloration is present.
  • It contributes to the understanding of rare tympanic membrane appearances and their clinical significance.