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Related Concept Videos

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...
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...
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...
Bone Remodeling01:40

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 Tissue01:17

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...

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Related Experiment Video

Updated: May 21, 2026

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
11:47

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Published on: June 8, 2014

'Tumour-induced osteomalacia'.

Javier Munoz1, Rosa Michel Ortega, Florence Celzo

  • 1Department of Hematology and Oncology, Henry Ford Hospital, Detroit, Michigan, USA. Javier.munoz@me.com

BMJ Case Reports
|June 28, 2012
PubMed
Summary
This summary is machine-generated.

A patient with muscle weakness and bone pain was diagnosed with a rare tumor causing hypophosphatemia. Surgical removal of the phosphaturic mesenchymal tumor resolved symptoms, highlighting its role in tumor-induced osteomalacia.

More Related Videos

Osteoclast Derivation from Mouse Bone Marrow
06:17

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Related Experiment Videos

Last Updated: May 21, 2026

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
11:47

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Published on: June 8, 2014

Osteoclast Derivation from Mouse Bone Marrow
06:17

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Area of Science:

  • Oncology
  • Endocrinology
  • Orthopedics

Background:

  • A 60-year-old male presented with progressive weakness, muscle cramps, and hip pain.
  • Initial investigations revealed pathological fractures of the femoral neck and hypophosphatemia.

Observation:

  • Bone scans indicated pseudofractures consistent with osteomalacia.
  • Positron emission tomography identified increased fludeoxyglucose uptake in the neck region.

Findings:

  • A phosphaturic mesenchymal tumor of mixed connective tissue type was diagnosed via fine needle aspiration of a neck mass.
  • Surgical resection of the tumor led to the resolution of the patient's generalized symptoms.

Implications:

  • This case highlights the importance of considering rare tumors in the differential diagnosis of tumor-induced osteomalacia.
  • Complete tumor resection offers a curative treatment for this condition, leading to symptom resolution and no recurrence at 12-month follow-up.