Compact bone, also called cortical bone, dense bone in which the bony matrix is solidly filled with organic ground substance and inorganic salts, leaving only tiny spaces (lacunae) that contain the osteocytes
What is the appearance of compact bone?
Compact bone appears solid and spongy bone consists of a web- or sponge-like arrangement of solidified extracelluar matrix. While compact bone appears at first glance to be solid and uninterrupted, closer inspections reveals that the osseous tissue only makes up from 70-95% of the available volume.
What does compact bone look like under a microscope?
If you look at compact bone under the microscope, you will observe a highly organized arrangement of concentric circles that look like tree trunks . Each group of concentric circles (each “tree”) makes up the microscopic structural unit of compact bone called an osteon (this is also called a Haversian system).
What are the 4 main parts of compact bone?
Compact bone tissue is made of cylindrical osteons that are aligned such that they travel the length of the bone. Haversian canals contain blood vessels only. Haversian canals contain blood vessels and nerve fibers. Spongy tissue is found on the interior of the bone, and compact bone tissue is found on the exterior .
What do Osteons look like?
Each osteon looks like a ring with a light spot in the center . The light spot is a canal that carries a blood vessel and a nerve fiber. The darker ring consists of layers of bone matrix made by cells called osteoblasts (check your textbook for an explanation of the difference between osteoblasts and osteocytes).
Why is compact bone so strong?
Compact bone is the heaviest, hardest type of bone. It needs to be very strong as it supports your body and muscles as you walk , run, and move throughout the day. About 80% of the bone in your body is compact. It makes up the outer layer of the bone and also helps protect the more fragile layers inside.
Where can you find compact bone?
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.
Are bone forming cells?
Osteoblasts are bone-forming cells, osteocytes are mature bone cells and osteoclasts break down and reabsorb bone. ... There are two types of ossification: intramembranous and endochondral.
What is spongy bone called?
Cancellous bone , also called trabecular bone or spongy bone, light, porous bone enclosing numerous large spaces that give a honeycombed or spongy appearance. The bone matrix, or framework, is organized into a three-dimensional latticework of bony processes, called trabeculae, arranged along lines of stress.
Does compact bone have bone marrow?
The bone is made up of compact bone, spongy bone, and bone marrow. Compact bone makes up the outer layer of the bone. Spongy bone is found mostly at the ends of bones and contains red marrow. Bone marrow is found in the center of most bones and has many blood vessels.
What is difference between compact bone and spongy bone?
| Compact Bone Structure Spongy Bone Structure | They are made of closely packed osteons. They are composed of minerals containing trabeculae. |
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What are bone cells called?
Bone is composed of four different cell types; osteoblasts , osteocytes, osteoclasts and bone lining cells. Osteoblasts, bone lining cells and osteoclasts are present on bone surfaces and are derived from local mesenchymal cells called progenitor cells.
Does compact bone contain trabeculae?
Bone contains an outer shell of dense, compact bone, whereas the inner region consists of thin, networks of bone called trabeculae. Three cells regulate the bone density and size.
Is Osteon compact bone?
Compact bone consists of closely packed osteons or haversian systems . The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix.
What are the 3 major functions of bone give examples of where we would see each?
- Mechanical. Support. Bones provide a framework for the attachment of muscles and other tissues. ...
- Protective. Bones such as the skull and rib cage protect vital organs from injury. Bones also protect the marrow.
- Metabolic. Mineral storage.
What is Osteon?
Osteon, the chief structural unit of compact (cortical) bone , consisting of concentric bone layers called lamellae, which surround a long hollow passageway, the Haversian canal (named for Clopton Havers, a 17th-century English physician).
