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Related Concept Videos

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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Bone Disorders01:29

Bone Disorders

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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.
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...
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Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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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...
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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 ...
5.9K
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...
1.9K
Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

4.3K
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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Updated: Jun 21, 2025

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Advances in Bone Biology.

Maria Rosa Iaquinta1, Monica Montesi2, Elisa Mazzoni3

  • 1Department of Medical Sciences, University of Ferrara, 64/b, Fossato di Mortara Street, 44121 Ferrara, Italy.

International Journal of Molecular Sciences
|July 13, 2024
PubMed
Summary
This summary is machine-generated.

Bone is a mineralized connective tissue providing support, protection, and enabling movement. It also houses bone marrow, crucial for the body's functions.

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Area of Science:

  • Orthopedics and Regenerative Medicine
  • Biomaterials Science
  • Skeletal Biology

Background:

  • Bone is a dynamic, mineralized connective tissue essential for structural integrity and locomotion.
  • It serves vital functions including protection of organs and housing bone marrow for hematopoiesis and immunity.
  • Understanding bone's unique properties is key to addressing skeletal diseases and injuries.

Discussion:

  • The intricate composition of bone, including collagen and hydroxyapatite, dictates its mechanical strength and healing capacity.
  • Investigating bone's biological roles offers insights into conditions like osteoporosis and fracture repair.
  • Advanced research focuses on biomimetic materials and tissue engineering for bone regeneration.

Key Insights:

  • Bone's remarkable ability to remodel and repair itself is fundamental to skeletal health.
  • Its role extends beyond structural support to encompass metabolic and endocrine functions.
  • The interplay between bone cells, extracellular matrix, and systemic factors influences skeletal homeostasis.

Outlook:

  • Future research aims to develop novel therapeutic strategies for bone defects and diseases.
  • Harnessing stem cell technology and growth factors holds promise for enhanced bone regeneration.
  • Personalized approaches to bone health management will likely emerge, considering genetic and lifestyle factors.