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An osteocyte, an oblate shaped type of bone cellwith dendritic processes, is the most commonly found cellin mature bone. It can live as long as the organism itself.[1] The adult human body has about 42 billion of them.[2] Osteocytes do not divide and have an average half life of 25 years. They are derived from osteoprogenitor cells, some of ...
Osteons on cross-section of a bone. In osteology, the osteon or haversian system (/ həˈvɜːr.ʒən /; named for Clopton Havers) is the fundamental functional unit of much compact bone. Osteons are roughly cylindrical structures that are typically between 0.25 mm and 0.35 mm in diameter. [1] Their length is often hard to define, [2] but ...
In the hollow within bones are many other cell types of the bone marrow. Components that are essential for osteoblast bone formation include mesenchymal stem cells (osteoblast precursor) and blood vessels that supply oxygen and nutrients for bone formation. Bone is a highly vascular tissue, and active formation of blood vessel cells, also from ...
An osteoclast (from Ancient Greek ὀστέον (osteon) 'bone' and κλαστός (clastos) 'broken') is a type of bone cell that breaks down bone tissue. This function is critical in the maintenance, repair, and remodeling of bones of the vertebral skeleton. The osteoclast disassembles and digests the composite of hydrated protein and mineral ...
Bones are commonly described with the terms head, neck, shaft, body and base. The head of a bone usually refers to the distal end of the bone. The shaft refers to the elongated sections of long bone, and the neck the segment between the head and shaft (or body). The end of the long bone opposite to the head is known as the base.
The human skeleton is the internal framework of the human body. It is composed of around 270 bones at birth – this total decreases to around 206 bones by adulthood after some bones get fused together. [ 1 ] The bone mass in the skeleton makes up about 14% of the total body weight (ca. 10–11 kg for an average person) and reaches maximum mass ...
BioTime Reports Isolation of Seven Diverse Cartilage and Bone Cell Types From Human Embryonic Stem Cells ALAMEDA, Calif.--(BUSINESS WIRE)-- BioTime, Inc. (NYSE MKT: BTX), a biotechnology company ...
There are 23 bones in the skull. Including the bones of the middle ear and the hyoid bone, the head contains 29 bones. Cranial bones (8) Occipital bone. Parietal bones (2) Frontal bone. Temporal bones (2) Sphenoid bone (sometimes counted as facial) Ethmoid bone (sometimes counted as facial)