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Related Concept Videos

The Auditory Ossicles01:11

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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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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Compact Bone01:27

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
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Updated: Dec 4, 2025

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Bone Damage in Chronic Otitis Media.

Jerzy Kuczkowski1, Wojciech Brzoznowski1, Tomasz Nowicki1,2

  • 1Department of Otolaryngology Medical University of Gdansk, Gdansk, Poland.

Ear, Nose, & Throat Journal
|October 22, 2020
PubMed
Summary
This summary is machine-generated.

Chronic otitis media causes middle ear bone destruction through inflammation. Key inflammatory molecules like tumor necrosis factor-α and interleukins accelerate this bone lysis.

Keywords:
bone erosionchronic otitis media

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Area of Science:

  • Otolaryngology
  • Inflammation Biology
  • Bone Metabolism

Background:

  • Chronic otitis media involves significant inflammation, leading to middle ear bone destruction.
  • Granulation tissue in chronic otitis media is characterized by the release of numerous cytokines.
  • Bone degradation occurs via osteoclasts, counterbalanced by protective factors.

Discussion:

  • Inflammatory cytokines, including tumor necrosis factor-α, interleukin-1, and interleukin-6, play a crucial role in osteoclast activation.
  • The OPG/RANKL system is implicated in modulating bone resorption within the middle ear.
  • These molecular mediators, present in cholesteatoma and granulation tissue, significantly enhance bone lysis.

Key Insights:

  • Inflammation is the primary driver of middle ear bone destruction in chronic otitis media.
  • Specific cytokines (TNF-α, IL-1, IL-6) and the OPG/RANKL pathway are key accelerators of osteolysis.
  • The interplay between bone degradation and protective factors highlights the complexity of the inflammatory process.

Outlook:

  • Further research into cytokine signaling pathways could reveal therapeutic targets.
  • Understanding the balance of protective and destructive factors may lead to novel treatment strategies.
  • Investigating the role of growth factors and hormones in this context warrants attention.