Spongy bone possesses lamellae, and if the trabeculae are thick enough, osteons will be present. Shape and Support The skeleton is made up of various bones and provides the framework for the body. Thus, the skeleton provides the basic shape and structure for the body.
There also are bands of fibrous connective tissue —the ligaments and the tendons —in intimate relationship with the parts of the skeleton.
The third general function of the skeleton is that of motion.
As a result, the shaft of a long bone resists bending or fracturing even when considerable force is applied from either end. Compact bone tissue tends to be thickest in those parts of a bone where stresses are applied in relatively few directions. Articular cartilage reduces friction and absorbs shock at freely movable joints.
The endosteum is a thin membrane that lines the medullary cavity. Functional Differences between Compact and Spongy Bone A layer of compact bone covers the surface of all bones.
For example, your ribs protect your lungs and heart, the bones of your vertebral column spine protect your spinal cord, and the bones of your cranium skull protect your brain see figure 6.
A distinctive characteristic of humans as compared with other mammals is erect posture. Imagine a single osteon as a drinking straw with very thick walls. Spongy bone is found wherever bones are not stressed heavily or where stresses arrive from many directions.
Osteoprogenitor cells divide to produce daughter cells that differentiate into osteoblasts. Spinal curvatures can also be excessive dorsoventrally kyphosis causing a hunch back and thoracic compression. Collagen fibers are tough and flexible.
The circumferential lamellae directly deep to the periosteum are called external circumferential lamellae. Its others functions are bodily movement, producing blood for the body, and storing minerals that the physical structure needs.
Irregular bones have complicated shapes and so cannot be classified into any of the above shape-based categories. The bones by themselves can't move without the muscles that are connected to them. Osteoprogenitor Cells Bone tissue also contains small numbers of stem cells termed osteoprogenitor cells ancestor.
Extensive areas of red marrow, such as in the spongy bone of the femur, are important sites of blood cell formation.
Inside the canaliculi are slender fingerlike processes of osteocytes. Each osteocyte directs the release of calcium from bone into blood and the deposition of calcium salts into the surrounding matrix.
Osteoblasts are responsible for the production of new bone—a process called osteogenesis. Yellow bone marrow contains adipose tissue, and the triglycerides stored in the adipocytes of this tissue can be released to serve as a source of energy for other tissues of the body.
In recent years, orthopedists have even performed prenatal surgery to correct spina bifida, a congenital defect in which the neural canal in the spine of the fetus fails to close completely during embryologic development.
The areas between neighboring osteons contain lamellae called interstitial lamellae, which also have lacunae with osteocytes and canaliculi. The medullary cavity or marrow cavity, is a hollow, cylindrical space within the diaphysis that contains fatty yellow bone marrow and numerous blood vessels in adults.
These tubelike units of bone generally form a series of parallel cylinders that, in long bones, tend to run parallel to the long axis of the bone.
Cancellous also known as 'spongy' bone tissue is located beneath the compact bone and consists of a meshwork of bony bars trabeculae with many interconnecting spaces containing bone marrow.The skeletal system is the body system composed of bones, cartilages, ligaments and other tissues that perform essential functions for the human body.
The skeletal bones are held together by ligaments, and tendons attach the muscles to the bones of the skeleton. The muscular and skeletal systems work together as the musculoskeletal system, which enables body movement and currclickblog.comd: Jun 17, The skeletal bones are held together by ligaments.
Tendons attach your muscles to the bones of your skeleton. The muscular and skeletal systems work together to carry out bodily movement, and together they are called the musculoskeletal system.
Human skeletal system, the internal skeleton that serves as a framework for the body. This framework consists of many individual bones and currclickblog.com also are bands of fibrous connective tissue—the ligaments and the tendons—in intimate relationship with the parts of the skeleton.
This article is concerned primarily with the gross structure and the function of the skeleton of the. skeletal system -six main functions Learn with flashcards, games, and more — for free. The adult human skeletal system consists of bones, as well as a network of tendons, ligaments and cartilage that connects them.
The skeletal system performs vital functions — support.Download