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. Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae.
What is the histology of bone cells?
The fundamental components of bone, like all connective tissues, are cells and matrix . ... They are derived from osteoprogenitor cells, a mesenchymal stem cell line. Osteocytes are inactive osteoblasts that have become trapped within the bone they have formed. Osteoclasts break down bone matrix through phagocytosis.
What is the histology of compact and spongy bone?
Compact bone tissue is composed of osteons and forms the external layer of all bones . Spongy bone tissue is composed of trabeculae and forms the inner part of all bones.
What is the name of the basic histological unit of compact bone?
The diagram above shows a transverse view of an osteon (Haversian system) – the basic unit of compact bone. The diagram above shows a longitudinal view of an osteon. Some, mostly older, compact bone is remodelled to form these Haversian systems (or osteons).
What is in the bone matrix histology?
Bones and Teeth, Histology of
Bone matrix (also known as osteoid) consists of about 33% organic matter (mostly Type I collagen) and 67% inorganic matter (calcium phosphate, mostly hydroxyapatite crystals) .
What is an example of compact bone?
Compact bone forms a shell around cancellous bone and is the primary component of the long bones of the arm and leg and other bones, where its greater strength and rigidity are needed.
Why do we need both compact and spongy bone?
They are the bone tissues in animals that provide shape and support to the body. Both types of bones contain osteoblasts and osteoclasts that are necessary for creating bones. Both compact and spongy bones contain proteins like collagens and osteoids , which mineralize to help in bone formation.
Which is the weakest cartilage?
Fibrous cartilage is the weakest of the three types of cartilage. It has the fewest cells, so it has numerous fibres and the most intercellular space. Fibrous cartilage is softer than hyaline cartilage, but it has thicker collagen fibres.
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.
Where is bone matrix found?
The bone matrix is that part of the bone tissue and forms most of the mass of the bone . It is comprised of organic and inorganic substances. The organic component of the bone matrix includes the collagen and ground substance whereas the inorganic component is the inorganic bone salts, mainly the hydroxyapatite.
What is the structure of 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. Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae.
Which type of bone is very hard and strong?
Compact bone is the solid, hard outside part of the bone. It looks like ivory and is extremely strong. Holes and channels run through it, carrying blood vessels and nerves. Cancellous (pronounced: KAN-suh-lus) bone, which looks like a sponge, is inside compact bone.
What are the characteristics of compact bone?
Compact bone has a sturdy calcified matrix with very few spaces . This layer not only forms a protective shell around the spongy bone tissue, but it also gives our bones their rigidity, strength, and resistance.
What material is the bone matrix rich in?
The bone matrix is rich in calcium and phosphorus . Bone Matrix consists of substances such as inorganic bone salts and collagen fibers. Bone matrix is a protein matrix that contains minerals like calcium and phosphorus which get deposited and form bones.
What is the function of the bone matrix?
Bone matrix constitutes a complex and organized framework that provides mechanical support and exerts essential role in the bone homeostasis . The bone matrix can release several molecules that interfere in the bone cells activity and, consequently, has a participation in the bone remodeling [117].
What is bone extracellular matrix made of?
The bone matrix comprises organic (40%) and inorganic compounds (60%) . Moreover, its exact composition differs based on sex, age, and health conditions. The main inorganic components of the ECM are calcium-deficient apatite and trace elements.
