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The Skeletal System
Chap 3 bones, joints, skeleton, etc.
Question | Answer |
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The Skeletal system... | consists of the bones, bone marrow, cartilage, joints, ligaments, synovial membrane, synovial fluid, and bursa. |
Only dental enamel is harder than bone | |
Periosteum | the tough, fibrous tissue that forms the outermost covering of bone. |
Compact Bone | is the dense, hard, and very strong bone that forms the protective outer layer of bones. |
Spongy Bone | is lighter, & not as strong, as compact bone. |
medullary cavity | is located in the shaft of a long bone & is surrounded by compact bone. |
endosteum | is the tissue that lines the medullary cavity. |
Red Bone Marrow | which is located within the spongy bone, is hemopoietic tissue that manufactures red blood cells, hemoglobin, white blood cells, & thrombocytes. |
Hemopoietic | means pertaining to the formation of blood cells. |
Yellow bone marrow | which functions as a fat storage area, is composed chiefly of fat cells & is located in the medullary cavity. |
Cartilage | is the smooth, rubbery, blue-white connective tissue that acts as a shock absorber between bones. Makes up flexible parts such as the ear & tip of nose. |
Articular cartilage | covers the surfaces of bones where they come together to form joints. This cartilage makes smooth movement possible & protects the bones from rubbing against each other. |
meniscus | is the curved fibrous cartilage found in some joints, such as the knee & the jaw. |
diaphysis | is the shaft of a long bone. |
epiphysis | which is covered with articular cartilage, is the wide end of a long bone. |
Proximal epiphysis | is the end of the bone located nearest to the midline of the body. |
Distal ephiphysis | is the end of the bone located farthest away from the midline. |
foramen | is an opening in a bone through which blood vessels, nerves, & ligaments pass. |
foramen magnum | is the hole the spinal cord passes through to the brain. |
process | is a normal projection on the surface of a bone that serves as an attachment for muscles & tendons. |
joints | which are also known as articulations, are the place of union between two or more bones. |
Fibrous joints | consisting of inflexible layers of dense connective tissue, hold the bones tightly together. In adults, these joints, aka sutures, do not allow any movement. |
fontanelles | aka as soft spots, are normally present on the skull of a newborn. These flexible soft spots facilitate the passage of the infant through the birth canal & allow for growth of the skull. |
Cartilaginous joints | allow only slight movement & consist of bones connected entirely by cartilage. |
Pubic symphysis | is the cartilaginous joint known that allows some movement to facilitate childbirth. |
synovial joint | is created where two bones articulate to permit a variety of motions. |
Ball & Socket joints | such as the hips & shoulders, allow a wide range of movement in many directions. |
Hinge joints | such as the knees & elbows, are synovial joints that allow movement primarily in one direction or plane. |
synovial joints | consist of several components that make complex movements possible. |
synovial capsule | is the outermost layer of strong fibrous tissue that resembles a sleeve as it surrounds the joint. |
synovial membrane | lines the capsule & secretes synovial fluid |
synovial fluid | which flows within the synovial cavity, acts as a lubricant to make the smooth movement of the joint possible. |
ligaments | are bands of fibrous tissue that form joints by connecting one bone to another bone, or joining a bone to cartilage. |
bursa | is a fibrous sac that acts as a cushion to ease movement in areas that are subject to friction such as the shoulder, elbow & knee joints where a tendon passes over a bone. |
The typical adult human skeleton consists of approximately | 206 bones |
axial skeleton | protects the major organs of the nervous, respiratory & circulatory systems. |
axial | means pertaining to an axis, which is an imaginary line that runs lengthwise through the center of the body. |
The axial skeleton consists of | 80 bones including those of the skull; the ribs, sternum, & thoracic vertebrae of the thoracic cavity; & the other vertebrae of the spinal column. |
appendicular skeleton | makes body movement possible & also protects the organs of digestion, excretion, & reproduction. |
appendage | is anything that is attached to a major part of the body. |
The appendicular skeleton consists of | 126 bones that are organized into the upper extremities & the lower extremities. |
frontal bone | forms the forehead. |
parietal bones | form most of the roof & upper sides of the cranium. |
occipital bone | forms the posterior floor & walls of the cranium. |
two temporal bones | form the sides & base of the cranium |
sphenoid bone | forms part of the base of the skull & parts of the floor & sides of the orbit. |
orbit | is the bony socket that surrounds & protects the eyeball. |
ethmoid bone | forms part of the posterior of the nose, the orbit, & the floor of the cranium. |
meatus | is the external opening of a canal. |
two nasal bones | form the upper part of the bridge of the nose. |
mandible | aka the jawbone, is the only moveable bone of the skull. |
thoracic cavity | aka the rib cage, is the bony structure that protects the heart & lungs. |
The 12 pairs of ribs | aka costals |
The shoulders form the | pectoral girdle, which supports the arms & hands; this also known as the shoulder girdle. |
radius | is the smaller & shorter bone in the forearm. |
ulna | is the larger & longer bone of the forearm. |
spinal column | aka the vertebral column, supports the head & body, & protects the spinal cord. |
vertebra | is a single segment of the spinal column. |
vertebral foramen | is the opening in the middle of the vertebra. The spinal cord passes through this opening. |
At birth, the sacrum is composed of five separate bones; however, they fuse together in the young child to form a single bone. | |
coccyx | aka the tailbone, forms the end of the spine & is actually made up of four small vertebrae that are fused together. |
intervertebral disks | which are made of cartilage, separate & cushion the vertebrae from each other. |
pelvic girdle | which protects internal organs & supports the lower extremities. |
pubic bones | are held securely together by the pubic symphysis. |
tibia | aka the shinbone, is the larger weight-bearing bone in the anterior of the lower leg. |
fibula | is the smaller of the two bones of the lower leg. |
malleolus | is the rounded bony protuberance on each side of the ankle. |
ankles | which form the joint between the lower leg & the foot, are each made up of seven short tarsal bones. |
colles' fracture | is aka a fractured wrist. This fracture occurs at the lower end of the radius when a person tries to stop a fall by landing on their hands. |
closed fracture | aka a simple fracture, or a complete fracture, is one in which the bone is broken, but there is no open wound in the skin. |
open fracture | aka a compound fracture, is one in which the bone is broken & there is an open wound in the skin. |
comminuted fracture | is one in which the bone is splintered or crushed. |
greenstick fracture | or incomplete fracture, is one in which the bone is bent & only partially broken. |
oblique fracture | occurs at an angle across the bone. |
pathologic fracture | occurs when a weakened bone breaks under normal strain. |
spiral fracture | is a fracture in which the bone has been twisted apart. |
stress fracture | which is an overuse injury, is a small crack in the bone that often develops from chronic excessive impact. |