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Bone Formation by Intramembranous Ossification

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 Ossification

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...

Growth of Cartilage and Bone Tissue

Growth of Cartilage and Bone Tissue

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...

Sutures of the Skull

Sutures of the Skull

The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
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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: Mar 5, 2026

Direct Mouse Trauma/Burn Model of Heterotopic Ossification

Direct Mouse Trauma/Burn Model of Heterotopic Ossification

Published on: August 6, 2015

Heterotopic Ossification in a Newborn: A Case Report.

Khalid Murrad¹, Alohali Rand¹, Jarman Abdulaziz²

¹King Saud University, Riyadh, Saudi Arabia.

|March 28, 2017

Summary

This summary is machine-generated.

Heterotopic ossification, the abnormal bone growth in soft tissues, is a rare condition in infants. This case report details a 27-day-old infant with DiGeorge syndrome who developed this condition on his hand.

Keywords:

congenital hand heterotopic newborn ossification

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Area of Science:

Pediatric Orthopedics
Developmental Biology
Medical Genetics

Background:

Heterotopic ossification (HO) is the development of bone in extraskeletal soft tissues.
HO is uncommon in the pediatric population, with limited literature available.
DiGeorge syndrome is a genetic disorder associated with various developmental abnormalities.

Observation:

A 27-day-old infant diagnosed with DiGeorge syndrome presented with heterotopic ossification.
The ossification was located on the dorsum of the infant's right hand.
This presentation is a rare occurrence in infants, especially those with DiGeorge syndrome.

Findings:

The case highlights the potential for HO in infants with genetic syndromes.
Early diagnosis and management are crucial for preventing functional impairment.
Conservative treatments include infection control, physiotherapy, and warm compresses.

Implications:

Increased awareness of HO in pediatric patients with genetic syndromes is warranted.
Further research into the pathogenesis and optimal management of HO in infants is needed.
Surgical intervention may be necessary for persistent or functionally limiting heterotopic ossification.