Haribala Paliwal. Muscle cells are elongated and arranged in parallel bundles that correspond to the direction of contraction. Imagine laying a heavy framed picture flat on the floor. Which of the following statements about bone tissue is false? Within a single trabecular, there are concentric lamellae , with osteocytes in lacunae connected to one another via canaliculi , similar to the tissue arrangement in the osteons of compact bone. This is the area of bone to which ligaments and tendons attach. Instead, it is a jelly-like substance that fills the cavity left by the trabecular network of bone. Watch this video to see the microscopic features of a bone. The structure of a long bone allows for the best visualization of all of the parts of a bone ((Figure)). Figure 1. Anatomy. Spongy bone is also called cancellous or trabecular bone. Bone microanatomy Bone is primarily composed of extracellular matrix, with organic and inorganic components. This slide shows trabecular, or spongy bone. Chapter 5: Bone. Bisphosphonates, drugs that decrease the activity of osteoclasts, are often used in the treatment of Paget’s disease. Structure and Composition of Bone June 13, 2019. 22. It is highly vascularized and contains red bone marrow. e.g., scapula and many bones of the skull. In this region, the epiphyses are covered with articular cartilage, a thin layer of cartilage that reduces friction and acts as a shock absorber. Spongy Bone: Spongy bone is the osseous tissue, which fills the interior cavity of bones, consisting of … One of us! We’d love your input. Between the trabeculae is the bone marrow. Histologically, spongy bone is comprised of anastomosing strips of slender bone known as trabeculae that enclose marrow and blood vessels. Description of the histology of bone tissue using images from our lab. Now if you look at the periphery of the bone, you have what is the harder, denser layer that surrounds the spongy bone. Spongy bone contains large marrow spaces defined by shelves and spicules of bone. They run along the length of the long bone and provide major vessel supply to the osteocytes. Spongy bone is usually located at the ends of the long bones (the epiphyses), with the harder compact bone surrounding it. In these studies, a dye containing a radioactive ion is injected into the body. Adipose 100x . Osteocytes can be seen in layers in adult spongy bone. Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide a surface for inorganic salt crystals to adhere. Osteoblasts become trapped in these secretions and differentiate into less active osteocytes. This makes up 20% of all bone. Spongy bone tissue does not contain osteons that constitute compact bone tissue. Immature osteogenic cells are found in the deep layers of the periosteum and the marrow. Arcuate plates lie parallel to each other, forming avascular bone beams. The bone matrix, or framework, is organized into a three-dimensional latticework of bony processes, called … This type of bone is located between layers of compact bone and is thin and porous. This type of bone is located between layers of compact bone and is thin and porous. It is nonlamellar bone or bundle bone. Osteoprogenitor cells are squamous stem cells that divide to produce daughter cells that differentiate into osteoblasts. The small dark ovals in the osteon represent the living osteocytes. Blood 400x . You need to get 100% to score the 23 points available. Osteocytes maintain the mineral concentration of the matrix via the secretion of enzymes. When the bone stops growing in early adulthood (approximately 18–21 years), the cartilage is replaced by osseous tissue and the epiphyseal plate becomes an epiphyseal line. 1. Bone scans are also useful. When occurring in the skull, Paget’s disease can cause headaches and hearing loss. Compact Bone 100x . Blood vessels and nerves enter the bone through the nutrient foramina to nourish and innervate bones. It is thick and dense. The cell responsible for bone resorption, or breakdown, is the osteoclast. The nerves sense pain, and it appears the nerves also play roles in regulating blood supplies and in bone growth, hence their concentrations in metabolically active sites of the bone. Which of the following are found in compact bone and cancellous bone? Total Points. The open spaces of the trabeculated network of spongy bone allow spongy bone to support shifts in weight distribution, which is the function of spongy bone. They remove bone structure by releasing lysosomal enzymes and acids that dissolve the bony matrix. Bone marrow lacks the rigidity of the surrounding bone. Begin by identifying the trabeculae, the spongy network of bone tissue in the center of the bone. Flat bones consists of two layers of compact bone with intervening spongy bone and marrow. Osteoblasts synthesize and secrete the organic part and inorganic part of the extracellular matrix of bone tissue, and collagen fibers. It also makes … Compact bone does not have any spaces or hollows in the bone matrix that are visible to the eye. (Figure) describes the bone markings, which are illustrated in ((Figure)). This type of bone contains red bone marrow and a network of bony trabeculae. The answer lies in the properties of a third category of bone cells—the osteogenic cell. A long bone has two parts: the diaphysis and the epiphysis. The epiphyses of bones, such as the neck of the femur, are subject to stress from many directions. Histology home page. 2. Four types of cells compose bony tissue: osteocytes, osteoclasts, osteoprogenitor cells, and osteoblasts. Spongy bone reduces the density of bone and allows the ends of long bones to compress as the result of stresses applied to the bone. It forms the relatively softer core of the bones that is filled with marrow. These are the attachment points for tendons and ligaments. As the blood passes through the marrow cavities, it is collected by veins, which then pass out of the bone through the foramina. Trabeculae are spaces created in the tissue by thin areas of osteoblast cells. So basically spongy bone is just this porous network of spikes surrounding the innermost portion of bone marrow. Areas of bone resorption have an affinity for the ion, so they will light up on the scan if the ions are absorbed. Compact bone (or cortical bone) forms the hard external layer of all bones and surrounds the medullary cavity, or bone marrow. As a result, trabecular bone has about 10 times the surface area of compact bone. It provides protection and strength to bones. In general, their size and shape is an indication of the forces exerted through the attachment to the bone. You could hold up one side of the picture with a toothpick if the toothpick was perpendicular to the floor and the picture. Bone marrow lacks the rigidity of the surrounding bone. Osteons in compact bone tissue are aligned in the same direction along lines of stress and help the bone resist bending or fracturing. To learn more: >> L'Apparato Scheletrico: nozioni di base >> L'Apparato Muscolare: nozioni di base >> L'Articolazione: che cos'è e perchè invecchia, il dolore articolare General information on bone tissue Trabecular bone, also known as cancellous bone or spongy bone, mainly serves a metabolic function. 5. A section of monkey femoral neck cortical bone showing cortical bone remodeling in progress (solid arrows) and several osteons that have completed a remodeling cycle (open arrows). The structure of a long bone allows for the best visualization of all of the parts of a bone (Figure \(\PageIndex{1}\)). The hollow region in the diaphysis is called the medullary cavity, which is filled with yellow marrow. (b) In this micrograph of the osteon, you can clearly see the concentric lamellae and central canals. Blood 40x . Dense bone b. Woven bone c. Immature bone d. Cancellous bone e. Spongy bone. Today 's Points. Histology (Total Magnification) Specific Cells are not labeled within each tissue, remember that many of the tissues have multiple cell types, make sure you are identifying the correct cells! Marrow spaces are also present. Therefore, compact bone tissue is prominent in areas of bone at which stresses are applied in only a few directions. Bone remodeling. The osteoblasts try to compensate but the new bone they lay down is weak and brittle and therefore prone to fracture. Which of the following are only found in cancellous bone? Bone marrow accounts for about 4 – 5% of the total body weight of an individual. The toothpick will break off right at the wall. Structure of Bone Tissue. 4. Spongy bone, also known as cancellous bone or trabecular bone, is a very porous type of bone found in animals. Cardiac Muscle 400x . This cross-section of a flat bone shows the spongy bone (diploë) lined on either side by a layer of compact bone. Paget’s disease is diagnosed via imaging studies and lab tests. There are two types of bone tissue: compact and spongy. From fetal leg Cross section, H&E Stain Virtual Microscopy here Other similar posts Areolar 400x . Flat bones, like those of the cranium, consist of a layer of diploë (spongy bone), lined on either side by a layer of compact bone ((Figure)). Areolar 40x. Compact - which is found in the shafts of long bones (in the diaphyses). Compact and Spongy Bone Tissue learn by taking a quiz; Online quiz to learn Compact and Spongy Bone Tissue; Your Skills & Rank. Osteoblasts are cells that make new bone. This shows the architecture of compact bone which is designed to nourish and regulate osteocytes and bone matrix. Normal leg bones are relatively straight, but those affected by Paget’s disease are porous and curved. Bone consists of four types of cells: osteoblasts, osteoclasts, osteocytes, and osteoprogenitor cells. 2. Now drill a hole and stick the toothpick into the wall to hang up the picture. trabecular - overview (Stain - Haematoxylin Eosin) Compact bone, or cortical bone, mainly serves a mechanical function. If the articular cartilage at the end of one of your long bones were to degenerate, what symptoms do you think you would experience? 0. As described earlier, canaliculi connect with the canaliculi of other lacunae and eventually with the central canal. The walls of the diaphysis are compact bone. The mineralized tissue is seen as spicules. Anatomy and Physiology by OSCRiceUniversity is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted. Compact bone tissue consists of osteons that are aligned parallel to the long axis of the bone, and the Haversian canal that contains the bone’s blood vessels and nerve fibers. Spongy (cancellous) bone - which is found at the ends of long bones (in the epiphysis). Cardiac Muscle 1000x . Spongy Bone 40x . The differences between compact and spongy bone are best explored via their histology. medcell.med.yale.edu/histology/bone_lab/trabecular_bone.php Oct 17, 2016 - This Pin was discovered by amani. Compact Bone: Compact bone is the non-cancellous portion of a bone, which largely consists of closely packed osteons and forms the hard exterior of the bone. Diagram of Blood and Nerve Supply to Bone. If you would like a large, unwatermarked image for your web page or … Osteoclasts engage in bone resorption. And regulate osteocytes and remove waste covers the entire outer surface of trabeculae that contain osteocytes. 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