divisions of skeletal system
This division includes the skull, vertebral column, and rib cage, the central support of the body.
What is the axial skeleton?
These types of bones are longer than they are wide and include the femur and humerus.
What are long bones?
This function gives the body its basic shape and supports its weight.
What is support?
These "bone-building" cells are responsible for secreting the organic matrix, or osteoid, of new bone tissue.
What are osteoblasts?
This type of freely movable joint, found in the shoulder and hip, allows for the greatest range of motion, including rotation, flexion, and extension.
What is a ball-and-socket joint?
This division consists of the limbs and girdles that attach them to the body.
What is the appendicular skeleton?
These bones, like carpals and tarsals, are cube-shaped and provide stability with little movement.
What are short bones?
The skull and rib cage perform this function by surrounding and protecting vital organs.
What is protection?
As the most common cell type in mature bone, these "managers" live in small chambers called lacunae and help maintain the bone matrix by sensing mechanical stress.
What are osteocytes?
The elbow and knee are classic examples of this type of synovial joint, which permits movement in only one plane, similar to a door part.
What is a hinge joint?
The axial skeleton contains this many bones in a normal adult human.
What is 80?
Flat and typically protective, these bones include the skull, ribs, and sternum.
what are flat bones?
Along with muscles, the skeletal system makes this possible by providing attachment points and acting as levers.
What is movement?
These large, multinucleated "demolition experts" are derived from hematopoietic stem cells and break down bone tissue to release minerals into the bloodstream, a process called resorption.
What are osteoclasts?
This fibrous connective tissue is responsible for connecting bones to other bones at a joint, providing stability and support.
What are ligaments?
The pectoral and pelvic girdles belong to this division because they connect the limbs to the trunk.
What is the appendicular skeleton?
Found in complex shapes like the vertebrae and some facial bones, these bones don't fit into any other categories.
What are irregular bones?
The bone matrix acts as a reservoir for essential ions like calcium and phosphorus, a function known as this.
What is mineral storage?
This dense outer layer of bone is composed of tightly packed cylindrical units called osteons, which provide great strength against compressive forces.
What is compact bone?
The movement that decreases the angle between two bones, such as bending your elbow or knee.
What is flexion?
This bone, sometimes called the "keystone of the skull, is part of the axial skeleton and connects the cranial and facial bones.
What is the sphenoid bone?
These small round bones are embedded within tendons, this type includes the patella.
What are sesamoid bones?
This process, called hematopoiesis, occurs in the red bone marrow and creates red and white blood cells and platelets.
What is blood cell production?
The inorganic portion of the bone matrix, which accounts for its hardness and rigidity, is primarily made of these calcium-phosphate crystals.
What are hydroxyapatite?
The joints that hold the plates of the skull together are an example of this type of joint, which allows no movement.
What are immovable joints?