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Related Concept Videos

Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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...
Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

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...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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...
Bone Disorders01:29

Bone Disorders

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.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
Bone Remodeling and Repair01:31

Bone Remodeling and Repair

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...

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Related Experiment Video

Updated: Jul 7, 2026

Culturing and Measuring Fetal and Newborn Murine Long Bones
06:58

Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

Osteogenesis imperfecta in the neonate.

Lorraine Hackley1, Linda Merritt

  • 1Medical Center of McKinney, McKinney, Texas, USA.

Advances in Neonatal Care : Official Journal of the National Association of Neonatal Nurses
|February 28, 2008
PubMed
Summary

Osteogenesis imperfecta is a rare genetic collagen disorder causing brittle bones and other symptoms. Early recognition through physical assessment aids in managing this condition and supporting affected families.

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Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
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Last Updated: Jul 7, 2026

Culturing and Measuring Fetal and Newborn Murine Long Bones
06:58

Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects
07:35

Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects

Published on: April 11, 2012

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
07:23

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

Area of Science:

  • Genetics and Molecular Biology
  • Pediatrics
  • Orthopedics

Background:

  • Osteogenesis imperfecta (OI) is a rare, inherited connective tissue disorder.
  • It primarily affects collagen production, leading to fragile bones.
  • OI presents with a wide spectrum of severity, from prenatal diagnosis to later-life identification.

Purpose of the Study:

  • To provide a comprehensive overview of osteogenesis imperfecta.
  • To discuss the etiologic origins and genetic basis of OI.
  • To enhance early recognition and understanding of OI's diverse manifestations.

Main Methods:

  • Literature review on osteogenesis imperfecta.
  • Presentation of a systematic physical assessment guide for early diagnosis.
  • Inclusion of pictorial examples to illustrate the spectrum of OI.

Main Results:

  • OI is characterized by osteopenia, blue sclera, bone deformities, and hearing loss.
  • Early and accurate diagnosis is crucial for timely intervention.
  • Understanding the wide spectrum of OI is essential for appropriate management.

Conclusions:

  • Early recognition of osteogenesis imperfecta through systematic physical assessment is vital.
  • Comprehensive management includes addressing clinical implications and providing robust family support.
  • Further research into etiologic origins can improve diagnostic and therapeutic strategies.