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Related Concept Videos

Bone Formation by Intramembranous Ossification01:29

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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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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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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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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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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Structural Joints: Cartilaginous Joints01:17

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
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Interface between intramembranous and endochondral ossification in human foetuses.

S Hayashi, J H Kim, S E Hwang

  • 1Department of Surgery & Research Institute of Clinical Medicine, Chonbuk National University Hospital , Jeonju. chobh@jbnu.ac.kr.

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Summary

Researchers studied fetal head development, finding distinct matrix and cellular differences between endochondral and membranous ossification. These insights into bone formation in the skull and jaw are crucial for understanding craniofacial growth.

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Area of Science:

  • Developmental biology
  • Craniofacial anatomy
  • Histology

Background:

  • The human fetal head exhibits extensive interfaces between endochondral and membranous ossification.
  • Understanding these distinct ossification processes is key to comprehending craniofacial development and potential abnormalities.

Purpose of the Study:

  • To investigate and compare the matrix composition and cellular characteristics of endochondral and membranous ossification in the human fetal head.
  • To analyze the expression of specific matrix proteins (aggrecan, tenascin-C, versican) and vascularization at the interface of these ossification types.

Main Methods:

  • Histological analysis of 8 human fetal heads (15-16 weeks gestation).
  • Immunohistochemical staining for aggrecan, tenascin-C, versican, and CD34.
  • Microscopic examination of ossification zones, particularly in the occipital squama and pterygoid process.

Main Results:

  • Differences in matrix composition were observed: aggrecan-positive cartilage was invaded by aggrecan-negative primitive bone.
  • Tenascin-C expression was localized to the periosteum at the interface, unlike in long bone development.
  • The pterygoid process showed significantly higher vascular density (CD34-positive vessels) in endochondral compared to membranous regions.

Conclusions:

  • Distinct molecular and cellular environments characterize endochondral and membranous ossification in the fetal head.
  • The membranous occipital bone likely contributes to skull growth for brain expansion.
  • The membranous pterygoid process may be adapted for flattening under muscular pressure.