Anatomy And Physiology Chaptetr 6 Osseous Tissue Ad Bone Structure Pdf
File Name: anatomy and physiology chaptetr 6 osseous tissue ad bone structure .zip
Their shapes and their functions are related such that each categorical shape of bone has a distinct function. Keep in mind, however, that the term describes the shape of a bone, not its size. Long bones are found in the arms humerus, ulna, radius and legs femur, tibia, fibula , as well as in the fingers metacarpals, phalanges and toes metatarsals, phalanges.
- Anatomy & Physiology: BIO 161 / 162
- Biology of Bone Tissue: Structure, Function, and Factors That Influence Bone Cells
- 6.4 Bone Formation and Development
The process of bone formation is called osteogenesis or ossification. After progenitor cells form osteoblastic lines, they proceed with three stages of development of cell differentiation, called proliferation, maturation of matrix, and mineralization. Based on its embryological origin, there are two types of ossification, called intramembranous ossification that occurs in mesenchymal cells that differentiate into osteoblast in the ossification center directly without prior cartilage formation and endochondral ossification in which bone tissue mineralization is formed through cartilage formation first. In intramembranous ossification, bone development occurs directly.
Anatomy & Physiology: BIO 161 / 162
By the sixth or seventh week of embryonic life, the actual process of bone development, ossification osteogenesis , begins. There are two osteogenic pathways—intramembranous ossification and endochondral ossification—but in the end, mature bone is the same regardless of the pathway that produces it. During intramembranous ossification , compact and spongy bone develops directly from sheets of mesenchymal undifferentiated connective tissue. The flat bones of the face, most of the cranial bones, and the clavicles collarbones are formed via intramembranous ossification. The process begins when mesenchymal cells in the embryonic skeleton gather together and begin to differentiate into specialized cells Figure 6. Some of these cells will differentiate into capillaries, while others will become osteogenic cells and then osteoblasts. Although they will ultimately be spread out by the formation of bone tissue, early osteoblasts appear in a cluster called an ossification center.
Bones make good fossils. While the soft tissue of a once living organism will decay and fall away over time, bone tissue will, under the right conditions, undergo a process of mineralization, effectively turning the bone to stone. A well-preserved fossil skeleton can give us a good sense of the size and shape of an organism, just as your skeleton helps to define your size and shape. Unlike a fossil skeleton, however, your skeleton is a structure of living tissue that grows, repairs, and renews itself. The bones within it are dynamic and complex organs that serve a number of important functions, including some necessary to maintain homeostasis. The most apparent functions of the skeletal system are the gross functions—those visible by observation. Simply by looking at a person, you can see how the bones support, facilitate movement, and protect the human body.
Biology of Bone Tissue: Structure, Function, and Factors That Influence Bone Cells
Bones are made of a combination of compact bone tissue for strength and spongy bone tissue for compression in response to stresses. Bones are considered organs because they contain various types of tissue, such as blood, connective tissue, nerves, and bone tissue. Osteocytes, the living cells of bone tissue, form the mineral matrix of bones. There are two types of bone tissue: compact and spongy. Compact bone or cortical bone , forming the hard external layer of all bones, surrounds the medullary cavity innermost part or bone marrow. It provides protection and strength to bones.
Aws ebs pricing calculator. This quiz will cover the basic functions and parts of the skeletal system. The skeletal system is one of six systems of the human body. Take this quiz to find out how much you know about the skeletal system. Continental o cost.
6.4 Bone Formation and Development
Bone tissue is continuously remodeled through the concerted actions of bone cells, which include bone resorption by osteoclasts and bone formation by osteoblasts, whereas osteocytes act as mechanosensors and orchestrators of the bone remodeling process. This process is under the control of local e. An imbalance between bone resorption and formation can result in bone diseases including osteoporosis. Recently, it has been recognized that, during bone remodeling, there are an intricate communication among bone cells.
Bone tissue osseous tissue differs greatly from other tissues in the body. Bone is hard and many of its functions depend on that characteristic hardness. Later discussions in this chapter will show that bone is also dynamic in that its shape adjusts to accommodate stresses. This section will examine the gross anatomy of bone first and then move on to its histology.
Bones are an important part of the musculoskeletal system. This article, the first in a two-part series on the skeletal system, reviews the anatomy and physiology of bone. The skeletal system is formed of bones and cartilage, which are connected by ligaments to form a framework for the remainder of the body tissues.
A bone is a rigid tissue that constitutes part of the vertebrate skeleton in animals.