The human being skeleton is created of the total collection of bones that administer the person body a multifunctional structure. The adult human skeletal system has 206 bones! It additionally consists that the joints, cartilage, tendons, and also ligaments that affix them.
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The main features of the skeletal mechanism are:support of the body Locomotion administer protection for inner organs Act as a site for the manufacturing of blood cells and also the warehouse of minerals, particularly calcium Growth and also development
The human being skeletal mechanism is split into two principal subdivisions: the axial and appendicular skeleton.
The axial skeleton forms the main axis that the human body and also is created of 80 skeleton that include the bones of the skull, the ossicles the the center ear, the hyoid bone the the throat, the vertebral column, and also the thoracic cage. It also provides protection and support for the brain, spinal cord, and critical organs, in enhancement to providing a surface for muscle to affix to.
The appendicular skeleton consists of 126 skeleton that encompass both the upper and lower limbs and bones of the shoulders and pelvis.
Components the the bones system
The skeletal mechanism is composed of four main fibrous and also mineralized connective tissues : bones, ligaments, tendons, and joints.
Bone: A rigid form of connective tissue that is part of the skeletal system of vertebrates and also is written principally of calcium.
Ligament: A little band the dense, white, fibrous elastic tissue. Ligaments connect the ends of bones with each other in stimulate to type a joint. They also assist in holding guts in place.
Tendon: A tough, flexible and inelastic band of fibrous connective organization that connects muscles to bones.
Joint: Joints organize the skeleton and also support movement. They can be grouped together by role and structure, such together ball-and-socket, hinge, and pivot joints.
Types the bones:
There are five varieties of skeleton in the human skeletal system: long, short, flat, irregular, and sesamoid.
Long bone: help to facilitate movement and support the weight of the body. Lengthy bones are identified by a long tubular shaft and also an articular surface ar at each end of the bone where ligaments and tendons attach. This bones encompass the major bones the the arms and legs such together the humerus and also femur, tibia and fibula, and also the radius and also ulna.
Short bone: helps to provide stability and movement in ~ the ankle and wrist joints. Castle provide little to no movement. Quick bones are about cube-shaped and also are as long as they space wide. Examples of this form of bone include the carpals and also metacarpals in the wrists and also ankles.
Flat bone: The major purpose of this kind of bone is to protect internal offal such as the brain, heart and lungs. It additionally provides a huge surface area because that muscles to attach to. Examples of this kind of bone incorporate the cranium (skull), the thoracic cage (sternum and ribs) and also the ilium (pelvis).
Irregular bone: These varieties of bones vary in size and structure with the shape usually being an extremely complex. Irregular skeletal serve different functions depending upon location. For example, vertebrae protect the spinal cord and together make up the spinal column. Another example would be the hyoid bone which helps to maintain tracheal and also pharyngeal support.
Sesamoid bone: The role of this bone is to defend tendons and diminish friction and wear on share surfaces. This form of bone is usually tiny and round and is found in the hands, feet, and knees. A common example the a sesamoid bone is the patella (kneecap).
When you think about the relationship in between the axial and appendicular skeleton and also the soft organization of the body, it i do not care clear the the primary functions of the skeleton space support, protection, and also motion. Of these functions, support is the oldest and most primitive; similarly, the axial skeleton was the very first to evolve.
A differentiating characteristic of the human skeleton in comparison to various other mammals is erect posture. Our bodies are, to part extent, comparable to a tall building with legs. Enormous benefits have been acquired from this type of posture through the many prevalent being the releasing of our arms and also hands for various other functions.
Different species of jointsBy function
Synarthrosis: these immovable and solid joints incorporate skull sutures, the articulations between the teeth and also the mandible, and the share found in between the an initial pair that ribs and the sternum.
Amphiarthrosis: this joints allow slight movement and also include the distal joint between the tibia and the fibula and also the pubic symphysis of the pelvic girdle.
Diarthrosis: these joints allow full movement and include many bone articulations in the upper and lower limbs. Instances of these include the elbow, shoulder, and also ankle.
By framework — see illustrations listed below as well
Fibrous: special connective tissues composed of collagen fibers found in between the articulations that fibrous joints.
Cartilaginous: Joints that sign up with bones through cartilage.
Synovial: this are identified by the presence of an articular capsule in between the two joined bones. Bone surfaces at synovial joints are safeguarded by a coating that articular cartilage.
Some examples of joints
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Watch several of the remarkable things our skeletal system permits humans to do!