What is periosteum and endosteum and what is its importance?

Article by: Rosa Pulido | Last update: April 10, 2022
Rating: 4.7/5
(17 ratings)

The inner surface of the bone is called the endosteum and is less active. The difference between endosteum and periosteum is that the periosteum is external and has a very active internal layer rich in osteoblasts called cambium, while in the endosteum the internal layer is active but not as active.

What is the periosteum and what is its importance?

It is the fibrous sheath that covers the bones. It contains the blood vessels and nerves that provide nutrition and sensation to the bone. The periosteum tends to be thicker in the young.

What is the Endosteum?

m. Thin membrane of connective tissue that lines the surface of the medullary cavity of the bone.

Where is the periosteum and endosteum?

The outer surface of a bone is covered with a thin layer of connective tissue that is very similar in morphology and function to the endosteum called the periosteum. During the growth of a bone, its width increases thanks to the osteoblasts that add new bone tissue in the periosteum.

Where is the Haversian system located?

Haversian canal: it is the central canal of the osteons, structures formed by osteocytes and bone extracellular matrix that appear in the compact bone tissue of some species. Nerves and blood vessels that supply this type of bone tissue run through the Haversian canal.

31 related questions found

Where is the Endochondral Ossification located?

The term “endochondral” means that the process is carried out from the inside to the outside. The reverse process, in which ossification occurs from outside the cartilage, is called perichondral.

What is inside the endosteum?

endosteal The periosteum is actively involved in bone development during fetal growth in the womb. However, it is the endosteum that produces more osteoprogenitor cells and osteoclasts which facilitate bone remodeling. The endosteal osteoblasts are flat and surrounded by type III collagen.

What is the function of osteoclasts?

The osteoclast is a large cell with multiple nuclei that can be identified separately. Osteoclasts are necessary for bone repair.

What is the function of the yellow bone marrow?

Yellow bone marrow is made up mostly of fat and contains the stem cells that develop into cartilage, fat, or bone cells. Bone anatomy. Bone is made up of compact bone, cancellous bone, and bone marrow. Compact bone forms the outer layer of bone.

What is the function of the bone marrow?

Bone marrow is a soft, spongy tissue that is in the center of most bones. The bone marrow makes different types of blood cells, for example: Red blood cells (also called erythrocytes), which carry oxygen from the lungs to all cells in the body.

Where is the yellow marrow?

The yellow bone marrow is found in long bones and serves as a fat store, although it is also the place where adipocytes (cells that form adipose tissue) and red blood cells are formed.

What type of tissue is yellow bone marrow?

Yellow bone marrow, which is adipose tissue and is located in the medullary canals of long bones.

How do osteoblasts work?

Osteoblasts: responsible for synthesizing and secreting the organic part of the bone matrix during its formation. They are always located on the surface of the bone tissue since it can only grow by apposition).

What is an osteoblast?

Interestingly, the cells of the osteoblastic lineage are not only responsible for the synthesis of new bone matrix, but they also seem to play a key role in the regulation of osteoclastogenesis and, therefore, in resorption.

How is the osteoclast formed?

Osteoclasts are formed by the fusion of several mononuclear cells derived from a blood stem cell in the bone marrow, showing many properties of macrophages, forming part of the monocyte macrophage system.

What are the cells of the endosteum called?

The inner or medullary surfaces of compact bone, as well as the vascular cavities of cancellous bone, are covered by the so-called endosteum (Figure 3), which contains osteogenic cells, osteoblasts and some osteoclasts.

What is inside the Osseous Trabeculae?

Structure of cancellous or trabecular bone

They are formed by thin trabeculae (Fig. 1), which, in already formed bones, correspond to lamellar bone tissue (Figs. 2 and 3) surrounded by bone lining cells.

What is found in cancellous bone?

Compact bone forms the outer layer of bone. Cancellous bone is found mostly at the ends of bones and contains red marrow. Bone marrow is in the center of most bones and has many blood vessels. There are two types of bone marrow: red and yellow.

Where does intramembranous ossification occur?

Intramembranous (or direct) ossification takes place directly in the connective tissue. By this process the flat bones of the cranial vault are formed: frontal bone, occipital bone, parietal bone and temporal bone.

What is endochondral and intramembranous ossification?

It is synonymous with the formation of bone tissue. There are two processes for forming normal bone tissue: Intramembranous ossification is the direct formation of bone from primitive connective tissue (mesenchyme), while endochondral ossification involves cartilage as a precursor.

Where is the growth plate found?

Growth plates are found near the ends of your child’s bones. If a fracture occurs in a growth plate, it can result in a shortened or crooked limb.

What is the function of osteoblasts and osteoclasts?

These are the osteoblasts, responsible for the formation of new bone tissue; the osteocytes, which are the mature osteoblasts and develop less activity; and osteoclasts, which are responsible for reabsorbing or eliminating bone matter.

How are osteoblasts produced?

osteogenesis. Osteoblasts originate from osteoprogenitor cells from the periosteum and bone marrow that are induced to differentiate through different growth factors, particularly as bone morphogenetic proteins.

What tissue houses the red bone marrow?

Red bone marrow is a highly irrigated substance (hence its color) that is made up of connective tissue and blood vessels, which contain: Erythrocytes. macrophage cells. Megakaryocytes.

What are the types of bone marrow?

Bone marrow is a type of tissue found inside bones. It can be of two kinds: red and yellow. Blood cells are made in the red bone marrow. This manufacturing process is called hematopoiesis or hemopoiesis.

Stay tuned to Techlyfire for more how to related post.

Leave a Comment