Cortical bone is the dense outer surface of bone that forms a protective layer around the internal cavity. This type of bone also known as compact bone makes up nearly 80% of skeletal mass and is imperative to body structure and weight bearing because of its high resistance to bending and torsion.
What do lamellae do?
In fishes, gill lamellae are used to increase the surface area between the surface area in contact with the environment to maximize gas exchange (both to attain oxygen and to expel carbon dioxide) between the water and the blood.
What is the function of the lamella?
Lamella: A sheet like membrane found within a chloroplast of an autotrophic cell. They act as a type of wall at which chloroplasts can be fixed within, achieving the maximum light possible.
What is the difference between lamellae and lacunae?
The lamellae are the concentric circles around the Haversian canal; they are a bone matrix formed from calcium, phosphorus salts and fibres. The lacunae are small spaces in the lamellae which provide an area for bone cells or osteocytes. This is the key difference between lamellae and lacunae.
What is the purpose of lamellae?
What is a lamellar cell?
In cell biology, lamellar bodies (otherwise known as lamellar granules, membrane-coating granules (MCGs), keratinosomes or Odland bodies) are secretory organelles found in type II alveolar cells in the lungs, and in keratinocytes in the skin.
What type of bone has a lamellated matrix?
Mature cortical and cancellous bone has a matrix of lamellated structure. The lamellae run parallel to the trabeculae of cancellous bone or concentrically surround the haversian canal and cortical bone, which forms an osteon, which is the functional unit of cortical bone.
What is the difference between thickness and form of lamellae?
Thickness and form of lamella may change from bone to bone and the location of the bone. Weight bearing bones such as the femur has more lamellae and they are thicker compared to less load-bearing upper extremity bones.
How does the thickness of the lamellae change from bone to bone?
Thickness and form of lamella may change from bone to bone and the location of the bone. Weight bearing bones such as the femur has more lamellae and they are thicker compared to less load-bearing upper extremity bones. In a transverse section, these lamellae are thicker in load-bearing sites.
What is the functional unit of lamellae?
The lamellae run parallel to the trabeculae of cancellous bone or concentrically surround the haversian canal and cortical bone, which forms an osteon, which is the functional unit of cortical bone. Modeling is the process whereby bone is laid down onto a surface without necessarily being preceded by resorption.
