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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...
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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.
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Hormones and Bone Tissue01:17

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Hormones That Influence Osteoblasts and/or Maintain the Matrix
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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.
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Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
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Related Experiment Video

Updated: Jun 14, 2026

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

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Published on: April 26, 2019

Polyhydramnios and bone development: an unexplored relationship.

S R Sekulić1, D Ilić, A Novakov-Mikić

  • 1Department of Neurology, University Clinics, Clinical Centre of Vojvodina, Hajduk, Veljkova 1-7, 21000 Novi Sad, Serbia. turija@EUnet.rs

Medical Hypotheses
|March 30, 2010
PubMed
Summary

Reduced mechanical stress in polyhydramnios may impact fetal bone development. Further studies are needed to understand bone mineralization in newborns from pregnancies complicated by excess amniotic fluid.

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Last Updated: Jun 14, 2026

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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:

  • Biomedical Engineering
  • Orthopedics
  • Fetal Development

Background:

  • Fluid immersion reduces apparent weight and bone density in adults (e.g., scuba divers).
  • Fetal development involves mechanical stress, influencing bone ossification.
  • Polyhydramnios (excess amniotic fluid) significantly decreases fetal apparent weight during late gestation.

Purpose of the Study:

  • To explore the impact of reduced mechanical stress in polyhydramnios on fetal bone development.
  • To highlight the lack of research on fetal bone mineralization in polyhydramnios cases.

Main Methods:

  • Literature review on bone demineralization due to fluid immersion.
  • Analysis of fetal apparent weight changes during gestation and in polyhydramnios.
  • Comparison of mechanical stress conditions in normal vs. polyhydramnios pregnancies.

Main Results:

  • Fetal apparent weight is significantly reduced in polyhydramnios (10-20% of actual weight).
  • This reduction implies diminished mechanical stress on fetal bones during a critical development period.
  • Existing research on this specific aspect of fetal bone development is notably absent.

Conclusions:

  • Polyhydramnios may negatively affect fetal bone development and ossification due to reduced mechanical loading.
  • Further research is crucial to investigate bone development and mineralization in infants born after pregnancies complicated by polyhydramnios.
  • Addressing misconceptions about fetal 'weightlessness' is important for understanding intrauterine bone health.