What is a woven bone?
[ wō′vən ] n. Bony tissue characteristic of the embryonic skeleton in which the collagen fibers of the matrix are arranged irregularly in the form of interlacing networks.
What does woven bone become?
‘Woven bone can be found in the embryonic skeleton and in cortical and cancellous bone in states of rapid bone growth, bone replacement, or high bone turnover. It is replaced in the normal skeleton by lamellar bone after completion of growth.
What is the function of woven bone?
The under-appreciated biological significance of woven bone is that it initiates formation de novo at sites of no previous bone. This information allows for targeted assessment of molecular-biophysical mechanisms underlying woven bone formation and their utilisation for initiating enhanced bone formation.
What are the Microanatomical structures of spongy bone?
Spongy bone contains large marrow spaces defined by shelves and spicules of bone. The inner space is lined by osteoblasts and osteoclasts (called the endosteum). Osteocytes can be seen in layers in adult spongy bone. Outside all of bone, is a connective tissue sheath called the periosteum (see below photograph).
How does woven bone become lamellar bone?
Once this matrix is calcified, it is partially resorbed by osteoclasts. After resorption and a reversal phase, osteoblasts differentiate in this area and form a layer of woven bone on top of the remaining cartilage. This woven bone will later be remodeled into lamellar bone.
Is woven bone immature?
The first type of bone formed developmentally is primary or woven bone (immature). This immature bone is later replaced by secondary or lamellar bone (mature).
Is woven bone avascular?
The embryonic cartilage is avascular. During its early development, a ring of woven bone is formed, the bone collar, at the periphery by intramembranous ossification in the future midshaft area under the perichondrium (which becomes periosteum).
What is lamella in bone?
Each osteon consists of concentric layers, or lamellae, of compact bone tissue that surround a central canal, the haversian canal. The haversian canal contains the bone’s blood supplies. Near the surface of the compact bone, the lamellae are arranged parallel to the surface; these are called circumferential lamellae.
What does the Diaphysis do?
The diaphysis is the main or midsection (shaft) of a long bone. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat)….
| Diaphysis | |
|---|---|
| Pronunciation | /daɪˈæfɪsɪs/ |
| Part of | Long bones |
| Identifiers | |
| MeSH | D018483 |
Is lamellar bone spongy or compact?
Each osteon consists of lamellae, which are layers of compact matrix that surround a central canal called the Haversian canal. The Haversian canal (osteonic canal) contains the bone’s blood vessels and nerve fibers (Figure 1).
What is the difference between woven and lamellar bone?
Woven bone (also known as fibrous bone), which is characterized by a haphazard organization of collagen fibers and is mechanically weak. Lamellar bone, which has a regular parallel alignment of collagen into sheets (“lamellae”) and is mechanically strong.
How do you put labels on the heart?
Drag and drop the text labels onto the boxes next to the heart diagram. If you want to redo an answer, click on the box and the answer will go back to the top so you can move it to another box.
What are the names of the parts of the heart?
Parts of the heart. Labels. Description. Vena cava. Carries deoxygenated blood from the body to the heart. Semilunar valve. Flaps that prevent backflow of blood. Left atrium.
Where are the valves located in the heart?
The function of the valves is to prevent the backward flow of blood through the heart. Let’s start with the tricuspid valve and mitral valve. The tricuspid and mitral valves are located between the atria and ventricles, so they can be referred to as the atrioventricular valves as a result.
Which is the Order of blood flow through the heart?
We will review the anatomy, function, and order of blood through the human heart using pictures of the atria, ventricles, tricuspid valve, mitral valve, pulmonary valve, aortic valve, superior and inferior vena cava, pulmonary arteries and veins, and aorta.