Osteocyte

Osteocyte
Osteocyte
Transverse Section Of Bone.png
Transverse Section Of Bone
Latin osteocytus
Code TH H2.00.03.7.00003

An osteocyte, a star-shaped cell, is the most abundant[citation needed] cell found in compact bone. Cells contain a nucleus and a thin ring of cytoplasm. When osteoblasts become trapped in the matrix they secrete, they become osteocytes. Osteocytes are networked to each other via long cytoplasmic extensions that occupy tiny canals called canaliculi, which are used for exchange of nutrients and waste through gap junctions. The space that an osteocyte occupies is called a lacuna (Latin for a pit). Although osteocytes have reduced synthetic activity and, like osteoblasts are not capable of mitotic division, they are actively involved in the routine turnover of bony matrix, through various mechanosensory mechanisms. They destroy bone through a rapid, transient (relative to osteoclasts) mechanism called osteocytic osteolysis.  Osteoblasts/osteocytes develop in mesenchyme. Hydroxyapatite, calcium carbonate and calcium phosphate is deposited around the cell.

External links



Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Osteocyte — Ostéocyte L ostéocyte est le devenir de l ostéoblaste. Il se situe dans le tissu osseux à la différence de l ostéoblaste, situé dans la matrice minéralisée. Il est logé dans des cavités creusées dans la matrice : l ostéoplaste. C est une… …   Wikipédia en Français

  • ostéocyte — [ ɔsteɔsit ] n. m. • 1964; de ostéo et cyte ♦ Biol. Cellule osseuse arrivée à maturité (opposé à ostéoblaste). ● ostéocyte nom masculin Cellule de base du tissu osseux. ostéocyte n. m. ANAT Cellule osseuse définitive. (V. ostéoblaste.) ost …   Encyclopédie Universelle

  • osteocyte — [äs′tē ō sīt΄] n. any of the branched cells in the tiny cavities of bone, that are involved in the formation of bone …   English World dictionary

  • Ostéocyte — L ostéocyte est la cellule du tissu osseux, elle est issue de l ostéoblaste. Un Ostéocyte et ses prolongements, logés dans le système ostéoplaste / canalicule Il se situe dans le tissu osseux à la différence de l ostéoblaste, situé dans la… …   Wikipédia en Français

  • osteocyte — /os tee euh suyt /, n. Cell Biol. a cell of osseous tissue within the bone matrix; a bone cell. [1940 45; OSTEO + CYTE] * * * ▪ cell       a cell that lies within the substance of fully formed bone. It occupies a small chamber called a lacuna,… …   Universalium

  • osteocyte — noun Date: 1942 a cell that is characteristic of adult bone and is isolated in a lacuna of the bone substance …   New Collegiate Dictionary

  • osteocyte — a cell derivid from an osteoblast responsible for building the hard matrix of bone (supportive fibres impregnated with calcium hydroxyapatite). Osteocytes are usually found in lacunae embedded in the hard matrix but may be superficial to the… …   Dictionary of ichthyology

  • osteocyte — Osteoblast that is embedded in bony tissue and which is relatively inactive …   Dictionary of molecular biology

  • osteocyte — A cell of osseous tissue that occupies a lacuna and has cytoplasmic processes that extend into canaliculi and make contact by means of gap junctions with the processes of other osteocytes. SYN: bone cell, bone corpuscle, osseous cell. [osteo + G …   Medical dictionary

  • osteocyte — os·te·o·cyte …   English syllables

Share the article and excerpts

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