Osseous tissue

Osseous tissue
Cross-section of a long bone showing both spongy and compact osseous tissue

Osseous tissue, or bone tissue, is the major structural and supportive connective tissue of the body. Osseous tissue forms the rigid part of the bone organs that make up the skeletal system.



Bone tissue is a mineralized connective tissue. It is formed by cells, called osteoblasts, that deposit a matrix of Type-I collagen and also release calcium, magnesium, and phosphate ions that ultimately combine chemically within the collagenous matrix into a crystalline mineral, known as bone mineral, in the form of hydroxyapatite. The combination of hard mineral and flexible collagen makes bone harder and stronger than cartilage without being brittle. Compact bone consists of a repeating structure called a Haversian system, or osteon, which is the primary anatomical and functional unit. Each osteon has concentric layers of mineralized matrix, called concentric lamellae, which are deposited around a central canal, also known as the Haversian canal, each containing a blood and nerve supply.

Compact bone (cross-section). (Haversian system and osteocytes).
Osteoblasts. actively synthesizing osteoid with two osteocytes.
Osteoclast with multiple nuclei and a "foamy" cytosol.


There are two types of osseous tissue: compact and spongy. Compact tissue is synonymous with cortical bone, and spongy tissue is synonymous with trabecular and cancellous bone. Compact bone forms the extremely hard exterior while spongy bone fills the hollow interior. The tissues are biologically identical; the difference is in how the microstructure is arranged.


Osseous tissue performs numerous functions including:


  • Support for muscles, organs, and soft tissues.
  • Leverage and movement.
  • Protection of vital organs, e.g., the heart. (Note: not all vital organs are protected by bones, e.g., the intestines.)
  • Calcium phosphate storage.


  • Hemopoiesis - formation of blood cells by the bone marrow interspersed within the spongy bone.

Osseous tissue versus bones

Bone tissue is different from bones themselves — bones are organs made up of bone tissue as well as marrow, blood vessels, epithelium and nerves, while bone tissue refers specifically to the mineral matrix that form the rigid sections of the organ.

See also


  • Henry Gray: Anatomy of the human body (Bartleby.com; Great Books Online)
  • Eldra P. Solomon - Richard R. Schmidt - Peter J. Adragna : Human anatomy & physiology ed. 2nd 1990 (Sunders College Publishing, Philadelphia) ISBN 0 03 011914 6

External links

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • osseous tissue — bone that has become ossified, whether normal or of a pathologic change to soft tissue. Called also bony t …   Medical dictionary

  • osseous tissue — noun the porous calcified substance from which bones are made • Syn: ↑bone • Derivationally related forms: ↑bonelet (for: ↑bone), ↑bone (for: ↑bone) …   Useful english dictionary

  • Tissue — A tissue in medicine is not like a piece of tissue paper. It is a broad term that is applied to any group of cells that perform specific functions. A tissue in medicine need not form a layer. Thus, The bone marrow is a tissue; Connective tissue… …   Medical dictionary

  • osteogenic tissue — 1. that part of the periosteum adjacent to bone and concerned in the formation of osseous tissue. 2. any tissue capable of generating bone …   Medical dictionary

  • bony tissue — osseous t …   Medical dictionary

  • Connective tissue — A material made up of cells that form fibers in the framework providing a support structure for other body tissues. Cartilage and bone are specialized forms of connective tissue. Connective tissue is typically rich in what is called extracellular …   Medical dictionary

  • Connective tissue neoplasm — Classification and external resources MeSH D009372 A connective tissue neoplasm|connective tissue tumor is a neoplasm arising from the tissues of the connective tissue. (Not all tumors in the connective tissue are of the connective tissue …   Wikipedia

  • fibro-osseous — fi·bro os·se·ous (fi″bro osґe əs) composed of both fibrous and bony tissue …   Medical dictionary

  • intrachondrial bone — osseous tissue occurring in cartilage matrix which has undergone calcification; found particularly in patches within the middle layer of the otic capsule. Called also globuli ossei …   Medical dictionary

  • Bone — This article is about the skeletal organ. For other uses, see Bone (disambiguation) and Bones (disambiguation). For the tissue, see Osseous tissue. Drawing of a human femur Bones are rigid organs that constitute part of the endoskeleton of… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”