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Related Concept Videos

The Hyoid Bone01:12

The Hyoid Bone

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The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...
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Larynx01:21

Larynx

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The human larynx, often referred to as the voice box, is an intricate organ located in the neck. It serves as a pathway for air to enter the lungs during respiration and is an essential component of voice production.
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids,...
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Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
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Bone Formation by Endochondral Ossification01:24

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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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Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
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Pharynx01:20

Pharynx

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The pharynx, a tubular structure framed by skeletal muscle and lined with mucous membrane, extends continuously from the nasal cavities. It is segmented into three major areas: the nasopharynx, oropharynx, and laryngopharynx.
Nasopharynx
The nasopharynx, bordered by the conchae of the nasal cavity, serves exclusively as an air conduit. In its superior region, the pharyngeal tonsils or adenoids are located. These tonsils are clusters of lymphoid reticular tissue akin to a lymph node. The precise...
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Related Experiment Video

Updated: Dec 24, 2025

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Ossification of the epiglottis.

C M Milroy1

  • 1Department of Forensic Pathology, University of Sheffield.

The Journal of Laryngology and Otology
|February 1, 1992
PubMed
Summary

Ossification of the epiglottis, typically elastic cartilage, is rare. This case study examines this unusual ossification and discusses heterotopic ossification in the head and neck region.

Area of Science:

  • Anatomy
  • Histology
  • Pathology

Background:

  • The epiglottis is primarily composed of elastic cartilage.
  • Elastic cartilage, unlike hyaline cartilage (thyroid, cricoid, arytenoids), typically does not ossify with age.

Observation:

  • A rare case of ossification within the epiglottis is presented.
  • This finding deviates from the usual age-related changes in laryngeal cartilages.

Findings:

  • The study details a specific instance of epiglottic ossification.
  • This ossification represents a form of heterotopic ossification.

Implications:

  • Highlights the potential for unusual ossification in laryngeal structures.
  • Contributes to the understanding of heterotopic ossification in the head and neck.

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  • May inform clinical diagnosis and management of laryngeal abnormalities.