# data[].attributes.body
there all your bones

# data[].attributes.body
thoes are his or her bones

# data[].attributes.body
https://imgc.allpostersimages.com/img/print/posters/the-skeletal-system-anatomical-chart-scientific-poster-print_a-G-12676948-10577378.jpg

# data[].attributes.body
there are 206 bones in your  body  and in baby bodys they have 300 bones

# data[].attributes.body
https://www.nestacertified.com/your-skeletal-system-explained/
Xitlaly

# data[].attributes.body
https://i1.wp.com/wiring-design.com/thumbs/nervous-system-interact-with-the-skeletal-system-1000__PN7p4e8BOSHTbnuIrvyxnAHaKe.jpg?quality=80&strip=all&w=190

# data[].attributes.body
heidi

# data[].attributes.attachment_link.readable_text
Human skeletal system , the internal skeleton that serves as a framework for the body. This framework consists of many individual bones and cartilages . There 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 normal human adult.

The human skeleton, like that of other vertebrates , consists of two principal subdivisions, each with origins distinct from the others and each presenting certain individual features. These are (1) the axial , comprising the vertebral column -the spine-and much of the skull , and (2) the appendicular , to which the pelvic (hip) and pectoral (shoulder) girdles and the bones and cartilages of the limbs belong. Discussed in this article as part of the axial skeleton is a third subdivision, the visceral, comprising the lower jaw , some elements of the upper jaw, and the branchial arches, including the hyoid bone.

When one considers the relation of these subdivisions of the skeleton to the soft parts of the human body-such as the nervous system , the digestive system , the respiratory system , the cardiovascular system , and the voluntary muscles of the muscle system -it is clear that the functions of the skeleton are of three different types: support, protection, and motion. Of these functions, support is the most primitive and the oldest; likewise, the axial part of the skeleton was the first to evolve. The vertebral column, corresponding to the notochord in lower organisms, is the main support of the trunk.

The central nervous system lies largely within the axial skeleton, the brain being well protected by the cranium and the spinal cord by the vertebral column, by means of the bony neural arches (the arches of bone that encircle the spinal cord) and the intervening ligaments.

A distinctive characteristic of humans as compared with other mammals is erect posture . The human body is to some extent like a walking tower that moves on pillars, represented by the legs. Tremendous advantages have been gained from this erect posture, the chief among which has been the freeing of the arms for a great variety of uses. Nevertheless, erect posture has created a number of mechanical problems-in particular, weight bearing. These problems have had to be met by adaptations of the skeletal system.

Protection of the heart , lungs , and other organs and structures in the chest creates a problem somewhat different from that of the central nervous system. These organs, the function of which involves motion, expansion, and contraction, must have a flexible and elastic protective covering. Such a covering is provided by the bony thoracic basket, or rib cage , which forms the skeleton of the wall of the chest, or thorax . The connection of the ribs to the breastbone-the sternum -is in all cases a secondary one, brought about by the relatively pliable rib (costal) cartilages. The small joints between the ribs and the vertebrae permit a gliding motion of the ribs on the vertebrae during breathing and other activities. The motion is limited by the ligamentous attachments between ribs and vertebrae.

The third general function of the skeleton is that of motion . The great majority of the skeletal muscles are firmly anchored to the skeleton, usually to at least two bones and in some cases to many bones. Thus, the motions of the body and its parts, all the way from the lunge of the football player to the delicate manipulations of a handicraft artist or of the use of complicated instruments by a scientist, are made possible by separate and individual engineering arrangements between muscle and bone.

Paper: Fact or Fiction?

In this article the parts of the skeleton are described in terms of their sharing in these functions. The disorders and injuries that can affect the human skeleton are described in the article bone disease .

Axial and visceral skeleton

The cranium

The cranium-the part of the skull that encloses the brain -is sometimes called the braincase, but its intimate relation to the sense organs for sight, sound, smell, and taste and to other structures makes such a designation somewhat misleading.

Development of cranial bones

The cranium is formed of bones of two different types of developmental origin-the cartilaginous, or substitution, bones, which replace cartilages preformed in the general shape of the bone; and membrane bones, which are laid down within layers of connective tissue . For the most part, the substitution bones form the floor of the cranium, while membrane bones form the sides and roof.

The range in the capacity of the cranial cavity is wide but is not directly proportional to the size of the skull, because there are variations also in the thickness of the bones and in the size of the air pockets, or sinuses. The cranial cavity has a rough, uneven floor, but its landmarks and details of structure generally are consistent from one skull to another.

The cranium forms all the upper portion of the skull, with the bones of the face situated beneath its forward part. It consists of a relatively few large bones, the frontal bone , the sphenoid bone, two temporal bones, two parietal bones, and the occipital bone . The frontal bone underlies the forehead region and extends back to the coronal suture, an arching line that separates the frontal bone from the two parietal bones, on the sides of the cranium. In front, the frontal bone forms a joint with the two small bones of the bridge of the nose and with the zygomatic bone (which forms part of the cheekbone; see below The facial bones and their complex functions ), the sphenoid, and the maxillary bones. Between the nasal and zygomatic bones, the horizontal portion of the frontal bone extends back to form a part of the roof of the eye socket, or orbit; it thus serves an important protective function for the eye and its accessory structures.

Each parietal bone has a generally four-sided outline. Together they form a large portion of the side walls of the cranium. Each adjoins the frontal, the sphenoid, the temporal, and the occipital bones and its fellow of the opposite side. They are almost exclusively cranial bones, having less relation to other structures than the other bones that help to form the cranium.

# data[].attributes.attachment_link.description
Human skeletal system , the internal skeleton that serves as a framework for the body. This framework consists of many individual bones and cartilages . There also are bands of fibrous connective tissue -the ligaments and the tendons -in intimate relationship with the parts of the skeleton.

# data[].attributes.body
Katy

# data[].attributes.attachment_link.readable_text
(Image credit: Shutterstock)

The human skeletal system is not quite as simple as the popular children's song suggests. The "head bone" (actually made up of 22 separate bones) is not connected to the "neck bone," but rather to a series of small bones that go all the way down the back. And the "toe bone" is actually made up of several bones that connect to another set of bones that provide structure for the foot. In total, the human skeleton consists of a whopping 206 bones.

In addition to all those bones, the human skeletal system includes a network of tendons, ligaments and cartilage that connect the bones together. The skeletal system provides the structural support for the human body and protects our organs. Our bones also serve several other vital functions, including producing blood cells and storing and releasing fats and minerals, according to the National Center for Biotechnology Information (NCBI).

Development and structure of the skeleton

Infants are born with about 300 separate bones, according to , a nonprofit children's health provider. As a child grows, some of those bones fuse together until growth stops, typically by the age of 25, leaving the skeleton with 206 bones.

Our bones are separated into two categories based on the purpose and location of the bones: The axial skeleton and the appendicular skeleton, according to the SEER program of the National Cancer Institute.

The axial skeleton contains 80 bones, including the skull, spine and rib cage. It forms the central structure of the skeleton, with the function of protecting the brain, spinal cord, heart and lungs.

The remaining 126 bones make up the appendicular skeleton; they include the arms, legs, shoulder girdle and pelvic girdle. The lower portion of the appendicular skeleton protects the major organs associated with digestion and reproduction and provides stability when a person is walking or running. The upper portion allows for a greater range of motion when lifting and carrying objects.

Bones are further classified by their shape: long, short, flat, irregular or sesamoid, according to SEER.

Long bones are found in the arms, legs, fingers and toes. These bones are longer than they are wide and are cylindrical. They move when the muscles around them contract, and they are the most mobile parts of the skeleton.

Short bones are found in the wrists and ankles and are about equal in their length, width and thickness.

Flat bones make up the skull, shoulder blades, sternum and ribs. These curved, thin bones protect internal organs and provide an anchor for muscles.

Irregular bones are those in the spinal cord and face, which, because of their unique dimension, don't fit in any of the other shape categories.

Sesamoid bones are found in the hands, wrists, feet, ears and knees. These small, round bones are embedded in tendons and protect them from the great pressure and force they encounter.

There are some variations between male and female skeletons. For example, the female pelvis is typically more broad, thin, and round than the male pelvis, according to the National Museum of Natural History. [Image Gallery: The BioDigital Human]

What's inside your bones?

(Image credit: Ross Toro, Livescience contributor)

Three main types of material make up every bone in your body: compact bone, spongy bone and bone marrow, according to the School of Life Sciences at Arizona State University.

Approximately 80% of every bone is compact bone, which is the hardest and strongest type of bone and is what allows the body to support its weight. Compact bone makes up the outer layers of the bone and protects the inner parts of the bones where many vital functions occur, such as bone marrow production. Compact bone consists primarily of cells called osteocytes. Microscopic passages in between the cells to allow nerves and blood vessels to pass through.

About 20% of each bone is spongy bone, which is filled with large holes and passages. Most often found toward the ends of individual bones, the spongy bone material is filled with bone marrow, nerves and blood vessels.

Two types of bone marrow fill the pores in spongy bone. Approximately half is red bone marrow, which is found mainly within flat bones such as shoulder blades and ribs. This is where all red and white blood cells and platelets (cells that help a cut stop bleeding) are made. Infant's bones contain all red bone marrow to produce enough blood cells to keep up with the youngsters' growth.

The other half of marrow is yellow bone marrow, which is found in long bones, such as thigh bones, and consists primarily of fat. Blood vessels run through both types of bone marrow to deliver nutrients and remove waste from the bones.

There are four main types of cells within bones: Osteoblasts, osteocytes, osteoclasts and lining cells, according to the NCBI.

Osteoblasts are cells that create new or repair existing bone material as the bones grow or break. The cells create a flexible material called osteoid and then fortify it with minerals to harden and strengthen it. When osteoblasts successfully finish their job, they retire to become osteocytes or lining cells.

Osteocytes, found in the compact bone, are responsible for exchanging minerals and communicating with other cells in the vicinity. They are formed from old osteoblasts that have gotten stuck in the center of bones.

Osteoclasts break down existing bone material and reabsorb it. These cells often work with osteoblasts to heal and reshape bone after a break (the osteoclasts break down the extra callus formed by the healing process) to make room for new blood vessels and nerves and to make bones thicker and stronger.

Lining cells are flat bone cells that completely cover the outside surface of bones. Their primary function is controlling the movement of minerals, cells and other materials into and out of the bones.

Diseases of the skeletal system

As with any part of the human body, bones are susceptible to injury and disease.

Some of the most common diseases that can affect the skeletal system include:

Osteoporosis is a disease that causes the density and strength of bones to decrease because bone loss occurs faster than bone growth. It can be caused by genetics or unhealthy lifestyle habits (such as lack of calcium or vitamin D, and heavy smoking or drinking with little exercise).

is a type of cancer that starts in the bone marrow and the lymphatic system, according to the Mayo Clinic. Several types of leukemia affect various blood cells and other systems of the body.

Osteoarthritis is a disease that causes the breakdown of the cartilage that protects the ends of bones in joints. This lack of cartilage leads to bone-on-bone rubbing, which can cause significant pain, damage to the bones and connective tissues, inflammation of the surrounding tissue and restricted motion, according to the Mayo Clinic.

Additional resources: This article was updated on Oct. 18, 2021, by Live Science contributor Ben Biggs. This article is for informational purposes only, and is not meant to offer medical advice.

# data[].attributes.attachment_link.description
(Image credit: Shutterstock) The human skeletal system is not quite as simple as the popular children's song suggests. The "head bone" (actually made up of 22 separate bones) is not connected to the "neck bone," but rather to a series of small bones that go all the way down the back.

# data[].attributes.body
You will love this funny video about bones

# data[].attributes.attachment_link.description
BrainPOP - Animated Educational Site for Kids - Science, Social Studies, English, Math, Arts & Music, Health, and Technology

# data[].attributes.body
https://www.brainpop.com/health/diseasesinjuriesandconditions/brokenbones/

# data[].attributes.body
https://www.acls.net/human-skeletal-system

# data[].attributes.attachment_link.title
Human skeletal system: Structure and functions

# data[].attributes.attachment_link.description
Explore the structure and functions of the human skeletal system. Learn about bones, joints, and their role in supporting the body.

# data[].attributes.body
https://www.acls.net/human-skeletal-system

# data[].attributes.body
https://www.brainpop.com/health/diseasesinjuriesandconditions/scoliosis/

# data[].attributes.body
https://www.brainpop.com/health/bodysystems/joints/

# data[].attributes.body
https://www.brainpop.com/health/bodysystems/skeleton/