Bone is a compact type of hardened connective tissue Connective tissue Connective tissues originate from embryonic mesenchyme and are present throughout the body except inside the brain and spinal cord. The main function of connective tissues is to provide structural support to organs. Connective tissues consist of cells and an extracellular matrix. Connective Tissue: Histology composed of bone cells, membranes, an extracellular mineralized matrix, and central bone marrow Bone marrow The soft tissue filling the cavities of bones. Bone marrow exists in two types, yellow and red. Yellow marrow is found in the large cavities of large bones and consists mostly of fat cells and a few primitive blood cells. Red marrow is a hematopoietic tissue and is the site of production of erythrocytes and granular leukocytes. Bone marrow is made up of a framework of connective tissue containing branching fibers with the frame being filled with marrow cells. Bone Marrow: Composition and Hematopoiesis. The 2 primary types of bone are compact and spongy. Because the matrix is mineralized (rather than aqueous), nutrients and waste cannot diffuse through the matrix. Bone has developed a unique structure to allow the functions to occur. The structure of bone allows the bone to be hard, but not too brittle, and gives bone the strength to resist compressive and bending forces. As a result, bone is ideally suited for the functions of support, protection of vital organs, and movement. In addition, bone produces blood cells in the marrow and is the body's primary storage site for calcium Calcium A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes. Electrolytes.
Last updated: Dec 12, 2022
Bone, as an organ, is made up of:
Bone can refer to:
Spongy (cancellous) bone:
Two primary membranes surround bone tissue: the periosteum (externally) and the endosteum (internally).
The 3 primary anatomic regions of long bones:
Bone markings are areas of bone where tendons, ligaments, and fascia Fascia Layers of connective tissue of variable thickness. The superficial fascia is found immediately below the skin; the deep fascia invests muscles, nerves, and other organs. Cellulitis attach, including articulations, projections, and holes.
The 2 primary components of bone are cells and matrix.
Bone contains a relatively small number of cells compared to the amount of matrix. In addition to other functions, the cells synthesize and break down the bone. Four major types of osseous cells exist:
Bone has a mineralized matrix (as opposed to an aqueous matrix in most other tissues, through which nutrients can easily diffuse). Bone has both organic and inorganic components:
In long bones, the majority of cells and matrix are arranged in functional units known as osteons.
An osteon (also known as a haversian system) is a cylinder of cells and matrix running longitudinally within compact bone. An osteon is made up of a longitudinal central canal, which is surrounded by concentric rings of osteocytes Osteocytes Mature osteoblasts that have become embedded in the bone matrix. They occupy a small cavity, called lacuna, in the matrix and are connected to adjacent osteocytes via protoplasmic projections called canaliculi. Bones: Development and Ossification, and bone matrix known as lamellae.
In spongy bone, rather than forming concentric rings within osteons, lamellae form concentric rings, which create the trabeculae.
Similarities between spongy and compact bone:
Differences between spongy and compact bone:
Bone marrow Bone marrow The soft tissue filling the cavities of bones. Bone marrow exists in two types, yellow and red. Yellow marrow is found in the large cavities of large bones and consists mostly of fat cells and a few primitive blood cells. Red marrow is a hematopoietic tissue and is the site of production of erythrocytes and granular leukocytes. Bone marrow is made up of a framework of connective tissue containing branching fibers with the frame being filled with marrow cells. Bone Marrow: Composition and Hematopoiesis: a general term for hematopoietic soft tissue Soft Tissue Soft Tissue Abscess occupying the spaces within bone.
Sign up now and get free access to Lecturio with concept pages, medical videos, and questions for your medical education.
Lecturio Premium gives you full access to all content & features
Verify your email now to get a free trial.
Lecturio Premium gives you full access to all contents and features—including Lecturio’s Qbank with up-to-date board-style questions.