The structural unit of compact bone is the osteon, an elongated cylinder oriented parallel to the long axis of the bone.
What is the structure and function of compact bone?
Compact bone (or cortical bone) forms the hard external layer of all bones and surrounds the medullary cavity, or bone marrow. It provides protection and strength to bones. Compact bone tissue consists of units called osteons or Haversian systems.
What is the Canaliculus?
Medical Definition of canaliculus
: a minute canal in a bodily structure: as. a : one of the hairlike channels ramifying a haversian system in bone and linking the lacunae with one another and with the haversian canal.
What is the center of the osteon called?
At the center of each osteon is a central canal (also known as a Haversian canal) through which blood vessels, lymph vessels, and nerves can travel to service and signal the cells throughout the compact bone.
What is the structure of bone?
As shown in Figure below, the basic structure of bones is bone matrix, which makes up the underlying rigid framework of bones, composed of both compact bone and spongy bone. The bone matrix consists of tough protein fibers, mainly collagen, that become hard and rigid due to mineralization with calcium crystals.
What is the functional unit of spongy bone?
The functional unit of spongy bone is the trabecula. This is a structure created by bone cells called osteocytes and the mineral matrix fixing them in
Where are the osteocytes?
osteocyte, a cell that lies within the substance of fully formed bone. It occupies a small chamber called a lacuna, which is contained in the calcified matrix of bone. Osteocytes derive from osteoblasts, or bone-forming cells, and are essentially osteoblasts surrounded by the products they secreted.
What is osteon or Haversian system?
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.
Are osteons and osteocytes the same?
Definition. Osteons refer to the chief structural unit of a compact bone, consisting of lamellae and Haversian canals. But, osteocytes refer to the bone cells formed when and osteoblasts become embedded in the material it has secreted.
Where is compact bone found?
Compact bone is the denser, stronger of the two types of bone tissue ((Figure)). It can be 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.
What are the three types of bone structure?
There are 3 types of bone tissue:
Compact tissue. This is the harder, outer tissue of bones.Cancellous tissue. This is the sponge-like tissue inside bones.Subchondral tissue. This is the smooth tissue at the ends of bones, which is covered with another type of tissue called cartilage.
