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Bone Cells and Tissue

Bone Cells and Tissue

Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the periosteum and...

Osteoclasts in Bone Remodeling

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...

Bone Remodeling

Bone Remodeling

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.

Hormones and Bone Tissue

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...

Bone Disorders

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...

Bone as Supporting Connective Tissue

Bone as Supporting Connective Tissue

Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
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Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts— that give the...

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Related Experiment Video

Updated: May 27, 2026

Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma

Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma

Published on: April 12, 2019

Osteoid osteoma and osteoblastoma.

Kivanc I Atesok¹, Benjamin A Alman, Emil H Schemitsch

¹University of Toronto, Toronto, ON, Canada.

The Journal of the American Academy of Orthopaedic Surgeons

|November 5, 2011

Summary

Osteoid osteoma and osteoblastoma are benign bone tumors that differ in size, location, and pain characteristics. Osteoid osteoma is smaller, causes night pain relieved by NSAIDs, and is treated conservatively or with minimally invasive surgery.

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Area of Science:

Orthopedics
Oncology
Pathology

Background:

Osteoid osteoma and osteoblastoma are common benign osteogenic bone neoplasms.
Both tumors present in adolescents and young adults, with a male predilection.
Histologically similar, they show increased osteoid formation and vascular fibrous stroma.

Purpose of the Study:

To differentiate between osteoid osteoma and osteoblastoma.
To outline the distinct clinical and histological features of each tumor.
To discuss current management strategies for these benign bone neoplasms.

Main Methods:

Comparative analysis of clinical presentation, imaging, and histopathology.
Review of treatment outcomes for both osteoid osteoma and osteoblastoma.
Literature review focusing on diagnostic criteria and therapeutic approaches.

Main Results:

Osteoblastomas are larger, more vascular, and exhibit greater osteoid production than osteoid osteomas.
Osteoid osteomas typically occur in long bones, causing night pain relieved by NSAIDs.
Osteoblastomas are more common in the axial skeleton, with less predictable pain patterns and higher recurrence rates.

Conclusions:

Osteoid osteoma management includes NSAIDs or minimally invasive surgery (e.g., radiofrequency ablation).
Osteoblastoma treatment requires surgical intervention (curettage or resection) due to local aggressiveness and recurrence potential.
Accurate differentiation is crucial for appropriate patient management and prognosis.