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Related Concept Videos

Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

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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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Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Spongy Bone01:09

Spongy Bone

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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).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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Bone as Supporting Connective Tissue01:23

Bone as Supporting Connective Tissue

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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts—...
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Bone Structure01:55

Bone Structure

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Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
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Related Experiment Video

Updated: Apr 1, 2026

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

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Bone development.

Agnes D Berendsen1, Bjorn R Olsen1

  • 1Department of Developmental Biology, Harvard School of Dental Medicine, Harvard University, USA.

Bone
|October 11, 2015
PubMed
Summary
This summary is machine-generated.

This review explores vertebrate skeletal evolution, detailing cartilage formation, ossification processes, and the influence of genetics and muscle forces on skeletal development and architecture.

Keywords:
Bone developmentEndochondral ossificationIntramembranous ossificationSkeletal patterningSomite differentiationTendon–bone attachmentTranscription factors

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Culturing and Measuring Fetal and Newborn Murine Long Bones
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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Biomineralization

Background:

  • Vertebrate skeletal development is a complex process shaped by evolutionary history.
  • Key evolutionary milestones include the emergence of cartilage, followed by biomineralization, and the development of the head skeleton preceding axial and appendicular structures.

Purpose of the Study:

  • To review the evolutionary and developmental processes underlying vertebrate skeletal formation.
  • To elucidate the roles of growth factors, transcription factors, and genetic mutations in ossification.
  • To examine the impact of muscle forces and mechanical loading on skeletal architecture and patterning.

Main Methods:

  • Literature review of evolutionary and developmental biology research.
  • Analysis of genetic and molecular mechanisms in skeletal development.
  • Discussion of biomechanical principles in bone formation and adaptation.

Main Results:

  • Cartilage formation predates biomineralization; head skeleton evolved before axial and appendicular structures.
  • Endochondral and intramembranous ossification are key processes in bone formation.
  • Muscle forces and mechanical loading significantly influence skeletal architecture and ontogenetic patterning.

Conclusions:

  • Skeletal development is a product of evolutionary history, genetic regulation, and mechanical influences.
  • Understanding these processes is crucial for comprehending skeletal disorders and evolutionary adaptations.