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Related Concept Videos

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.
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Review and Preview01:10

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In statistics, several tools are used to interpret the data. Measures of central tendency represent the characteristics of the data, such as mean, median, and mode. Additionally, measures of variance like standard deviation and range are used to find the spread of data from the mean. Relative standing measures the distance between data locations. Commonly used measures of relative standings are percentile, z score, and quartiles.
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Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative continuous, or quantitative discrete. Because it is not practical to measure the entire population in a study, researchers use samples to represent the population. A random sample is a representative group from the population chosen by using a method that gives each individual in the population an equal chance of being included in the sample. Random...
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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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¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

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Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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Ethics in Research

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Today, scientists agree that good research is ethical in nature and is guided by a basic respect for human dignity and safety. However, this has not always been the case. Modern researchers must demonstrate that the research they perform is ethically sound.
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Related Experiment Video

Updated: Jan 25, 2026

Direct Mouse Trauma/Burn Model of Heterotopic Ossification
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Heterotopic Ossification: A Comprehensive Review.

Carolyn Meyers1, Jeffrey Lisiecki2, Sarah Miller1

  • 1Department of Pathology Johns Hopkins University Baltimore MD USA.

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|May 3, 2019
PubMed
Summary
This summary is machine-generated.

Heterotopic ossification (HO), the formation of bone in soft tissues, is a complex complication of trauma and surgery. This review synthesizes clinical features, causes, and treatments for this condition.

Keywords:
ECTOPIC BONEFIBRODYSPLASIA OSSIFICANS PROGRESSIVAHETEROTOPIC BONEMYOSITIS OSSIFICANS

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Area of Science:

  • Bone and Mineral Research
  • Pathology
  • Tissue Repair

Background:

  • Heterotopic ossification (HO) involves extraskeletal bone formation in muscle and soft tissues.
  • It is frequently observed as a complication following trauma and surgical procedures.
  • HO represents a dysregulated tissue repair process.

Purpose of the Study:

  • To provide a comprehensive review of heterotopic ossification (HO).
  • To synthesize clinical, pathoetiologic, and basic biologic aspects of HO.
  • To cover both genetic and nongenetic forms of HO.

Main Methods:

  • Literature review synthesizing existing knowledge on HO.
  • Discussion of clinical presentation, radiographic findings, and histopathologic diagnosis.
  • Exploration of current treatment modalities and mechanistic bases of HO.

Main Results:

  • HO is characterized by extraskeletal bone formation, often following trauma or surgery.
  • The review details clinical features, diagnostic methods, and treatments.
  • Mechanistic insights cover cell types, inflammatory factors, and necessary "niche" conditions for HO initiation.

Conclusions:

  • Heterotopic ossification (HO) is a significant clinical challenge requiring further understanding.
  • The review consolidates current knowledge on the pathophysiology and management of HO.
  • Further research into the cellular and molecular mechanisms is crucial for developing effective therapies.