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Related Concept Videos

Growth of Cartilage and Bone Tissue01:27

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...
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...
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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 bone...
Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

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.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary or...
Bone Disorders01:29

Bone Disorders

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...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...

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Related Experiment Video

Updated: Jul 6, 2026

An Ex Vivo Tissue Culture Model of Cartilage Remodeling in Bovine Knee Explants
07:10

An Ex Vivo Tissue Culture Model of Cartilage Remodeling in Bovine Knee Explants

Published on: November 3, 2019

[Osteocartilaginous exostoses (osteochondromas)].

I V Bulycheva, L A Semenova, A N Makhson

    Arkhiv Patologii
    |March 29, 2008
    PubMed
    Summary

    Osteochondroma is a common bone tumor characterized by a cartilage-capped bony projection. Recognizing features like altered cartilage architecture is crucial for identifying potential malignant transformation.

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    Area of Science:

    • Orthopedic Oncology
    • Skeletal Biology
    • Bone Neoplasms

    Background:

    • Osteochondroma, the most common benign bone neoplasm, presents as a cartilage-capped bony outgrowth.
    • These tumors typically arise in bones formed via endochondral ossification and can be solitary or multiple.
    • Most cases occur within the first three decades of life, with no significant sex predilection.

    Discussion:

    • The characteristic structure includes perichondrium, cartilage, and bone layers, with the cartilage cap resembling a growth plate.
    • Enchondral ossification is the primary process within the cartilage cap.
    • Specific histological features, such as loss of cartilage architecture, increased cellularity, atypia, and necrosis, may signal secondary malignant change.

    Key Insights:

    • Osteochondromas are defined by their unique histological layers and growth patterns.
    • The potential for malignant transformation necessitates careful histopathological evaluation.
    • Understanding the cellular and architectural features is key to diagnosis and monitoring.

    Outlook:

    • Further research into the genetic and molecular drivers of osteochondroma development and malignant transformation is warranted.
    • Improved diagnostic criteria for differentiating benign from malignant lesions will enhance patient outcomes.
    • Long-term surveillance strategies for patients with osteochondromas may be refined based on risk stratification.