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Related Concept Videos

Overview of the Skull01:08

Overview of the Skull

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The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case, or cranial vault. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws.
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
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Bone Structure01:55

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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Cranial Bones: Superior and Posterior View01:14

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The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
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Overview of Hematopoiesis01:20

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
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The Functions of the Skeletal System01:22

The Functions of the Skeletal System

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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
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Compact Bone01:27

Compact Bone

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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Related Experiment Video

Updated: Jan 7, 2026

Intravital Longitudinal Imaging of Vascular Dynamics in the Calvarial Bone Marrow
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Intravital Longitudinal Imaging of Vascular Dynamics in the Calvarial Bone Marrow

Published on: April 11, 2025

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Functional Specialization of the Calvarial Bone Marrow.

Bong Ihn Koh1,2, Ralf Adams3

  • 1Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, United States.

Physiology (Bethesda, Md.)
|December 13, 2025
PubMed
Summary

Calvarial bone marrow is a unique immune niche supporting brain health. It maintains immune function and stem cells with age, unlike long bones, offering new therapeutic targets.

Keywords:
bone marrowhematopoiesismeningesskullvascular biology

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In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow
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A Human Bone Marrow 3D Model to Investigate the Dynamics and Interactions Between Resident Cells in Physiological or Tumoral Contexts
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Area of Science:

  • Immunology
  • Neuroscience
  • Hematology

Background:

  • Calvarial bone marrow (BM) is a distinct hematopoietic niche.
  • It harbors unique immune cells and connects to the dura mater via specialized channels.
  • These channels facilitate immune cell trafficking and cerebrospinal fluid (CSF) flow, enabling central nervous system (CNS) communication.

Purpose of the Study:

  • To investigate the specialized functions of calvarial bone marrow.
  • To compare calvarial BM with long bone marrow in terms of structure, immune cell content, and aging resilience.
  • To explore the role of calvarial BM in neuroimmune surveillance and CNS-related pathologies.

Main Methods:

  • Comparative analysis of calvarial and long bone marrow microenvironments.
  • Characterization of vascular and stromal architecture.
  • Assessment of immune cell populations and hematopoietic stem cell maintenance.
  • Evaluation of calvarial BM response to aging and pathological stressors.

Main Results:

  • Calvarial BM exhibits unique vascular and stromal features supporting hematopoietic stem cells.
  • It maintains immune integrity and hematopoiesis into advanced age, resisting aging-related decline seen in long bones.
  • Calvarial BM shows distinct responses to stressors like pregnancy, stroke, and leukemia.

Conclusions:

  • Bone marrow specialization is anatomically determined and linked to local physiological needs.
  • Calvarial BM is crucial for neuroimmune surveillance and CNS health.
  • Understanding calvarial BM dynamics offers potential for novel therapies targeting CNS disorders.