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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...

The Bone Matrix

The Bone Matrix

Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...

Spongy Bone

Spongy Bone

All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...

Compact Bone

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...

Bone as Supporting Connective Tissue

Bone as Supporting Connective Tissue

Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
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—...

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.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...

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Related Experiment Video

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Author Spotlight: Enhancing Small Animal Bone Compression Testing for Research

Author Spotlight: Enhancing Small Animal Bone Compression Testing for Research

Published on: December 1, 2023

Brain-Bone Axis in Physiological and Pathological Conditions.

Luca Massaccesi^1,2, Massimiliano Marco Corsi Romanelli^1,3, Emanuela Galliera^1,2

¹Department of Biomedical Sciences for Health, Università degli Studi di Milano, 20133 Milan, Italy.

International Journal of Molecular Sciences

|October 16, 2025

Summary

The brain-bone axis reveals bidirectional communication between the central nervous system (CNS) and skeletal metabolism. Understanding this connection offers new avenues for diagnosing and treating neurological and bone disorders.

Keywords:

Alzheimer’s disease (AD)Parkinson’s disease (PD)brain–bone axis hormones neurotransmitters regulatory mechanisms

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Published on: December 16, 2022

Area of Science:

Neuroscience
Endocrinology
Orthopedics

Background:

The brain-bone axis describes the complex bidirectional communication between the central nervous system (CNS) and skeletal metabolism.
This interaction influences bone health and neurological function, with growing research interest.

Purpose of the Study:

To review the mechanisms regulating the brain-bone axis.
To identify key molecular players and signaling pathways involved.
To discuss the clinical implications of brain-bone axis dysfunction.

Main Methods:

Literature review of studies on the central nervous system (CNS) and skeletal metabolism.
Analysis of regulatory mechanisms and key molecular players.
Examination of pathological conditions and clinical relevance.

Main Results:

Detailed exploration of the bidirectional communication pathways.
Identification of critical neurochemical and hormonal mediators.
Association of axis dysfunction with CNS and skeletal diseases.

Conclusions:

The brain-bone axis is a crucial regulator of integrated physiological health.
Further research holds promise for novel diagnostic and therapeutic strategies.
Targeting this axis could enhance both skeletal and neurological health outcomes.