What is the difference between lacunae canaliculi and matrix

Each osteon is a compact cylinder of concentric lamellae. The only cells in an osteon are the osteocyte s that are found on the edges of each lamella. Osteocytes are found in lacunae , which are the cell-shaped empty spaces that prevent the solid, mineralized extracellular material of bone from crushing the osteocytes.

Cytoplasmic extensions branch out from each osteocyte and are housed in the canaliculi , the thin empty channels that again prevent the solid, mineralized extracellular material from crushing the osteocyte extensions. At the center of each osteon is a central canal also known as a Haversian canal through which blood vessels, lymph vessels, and nerves can travel to service and signal the cells throughout the compact bone. Compact bone is sometimes called cortical bone.

At the outer edges of compact bone, rather than being arranged in osteons, the osseous tissue is arranged in circumferential lamellae. These travel parallel to the outer edge of the bone and are usually only a few lamellae deep before the osteons start up.

The bones of the body only have compact bone on their outermost surfaces and never very deep. The bulk of most bone tissue is made of spongy bone.

In spongy bone there far more uncompacted space. The rest of the volume is made up of mostly bone marrow , although there are also blood vessels, lymph vessels, nerves traveling through the spaces. In spongy bone the osseous tissue is arranged into trabeculae , which are the interconnected columns of osseous tissue which create the sponge-like grid of spongy bone.

Beside above, what are lacunae for? Between the rings of matrix, the bone cells osteocytes are located in spaces called lacunae. Small channels canaliculi radiate from the lacunae to the osteonic haversian canal to provide passageways through the hard matrix. Bone canaliculi are microscopic canals between the lacunae of ossified bone. The radiating processes of the osteocytes called filopodia project into these canals. Osteocytes do not entirely fill up the canaliculi. The remaining space is known as the periosteocytic space, which is filled with periosteocytic fluid.

Chondrocytes , or chondrocytes in lacunae , are cells found in cartilage connective tissue. They are the only cells located in cartilage. They produce and maintain the cartilage matrix, which is a type of lake in which the chondrocytes swim. Bones are composed of two types of tissue: A hard outer layer called cortical compact bone , which is strong, dense and tough.

A spongy inner layer called trabecular cancellous bone. The haversian canals surround blood vessels and nerve cells throughout bones and communicate with bone cells contained in spaces within the dense bone matrix called lacunae through connections called canaliculi.

Fibrocartilage is found in the soft tissue-to- bone attachments, pubic symphysis, the anulus fibrosus of intervertebral discs, menisci, the triangular fibrocartilage and the TMJ. The lacunae are situated between the lamellae , and consist of a number of oblong spaces.

In an ordinary microscopic section, viewed by transmitted light, they appear as fusiform opaque spots. Each lacuna is occupied during life by a branched cell, termed an osteocyte, bone-cell or bone-corpuscle.

Formation of woven bone As the spicules continue to grow, they fuse with adjacent spicules and this results in the formation of trabeculae. When osteoblasts become trapped in the matrix they secrete, they differentiate into osteocytes.

Osteoblasts continue to line up on the surface which increases the size. Answer and Explanation: There are two main types of bone cells : osteocytes and osteoblasts. Osteocytes are located within the bone , while osteoblasts are located along the. Appositional growth is the increase in the diameter of bones by the addition of bony tissue at the surface of bones.

Osteoblasts at the bone surface secrete bone matrix, and osteoclasts on the inner surface break down bone. Bone is a living, dynamic tissue. It takes place in the bones of the skull. Answer: Activation, resorption, reversal, formation. See pre-lab for more details. Slides Please select whether to view the slides in study mode or quiz mode.

In study mode, the images will contain labels and a description. In quiz mode, labels and description will be hidden. Study Mode. The calcified bone is purple.

The non-calcified elements are light blue. Find areas of compact bone and trabecular bone. This slide shows endochondral ossification, the process by which cartilage is calcified to form bone. Begin by distinguishing bone from the surrounding muscle tissue and from the cartilage epiphyses. Indicate the regions in which cartilage is being concerted into bone. Identify the specific areas where chondrocytes are resting, proliferating, maturing, undergoing hypertrophy, and calcifying.

Pathology Please select whether to view the slides in study mode or quiz mode. Quiz Name the precursor to this cell. Answer: This is an osteocyte, which is an osteoblast that has become encased in bone.

The embryonic precursor to both of these is the osteoprogenitor cell, a mesenchymal stem cell. Answer: Lysosomal hydrolases, collagenase, acid pH. Answer: Epiphyseal Plate. Answer: Bone remodeling.