58 terms

Unit 05 - Skeletal System


Terms in this set (...)

Band of dense fibrous regular connective tissue that connects bones.
The end of a long bone, attached to the diaphysis.
Cuplike cavity on lateral surface of the hip bone that receives the femur.
axial skeleton
The bones of the skull, vertebral column, thoracic cage.
The second cervical vertebra; has a vertical projection called the dens around which the atlas rotates
Bone-forming cells; secrete bone matrix; respond to the hormone calcitonin
Increased softening of the bone resulting from a gradual decrease in rate of bone formation. Adequate intake of calcium and vitamin D may help prevent this disorder.
intervertebral discs
Discs of fibrocartilage between vertebrae.
The disease in which uric acid accumulates in the blood and may be deposited as needle-shaped crystals in the soft tissues of joints
Large cells that resorb or break down bone matrix; respond to PTH thereby raising blood calcium levels.
Freely movable joint; synovial joints
The first cervical vertebra; articulates with the occipital bone of the skull and the second cervical vertebra.
A small space, cavity, or depression; _?_ in bone or cartilage are occupied by cells.
Blood cell formation; occurs in red bone marrow
Double-layered connective tissue that covers and nourishes the bone.
Elongated shaft of a long bone.
Disease in children whose diets lack calcium or vitamin D, where the bones fail to calcify.
sella turcica
depression in sphenoid bone that holds pituitary gland
cartilage cells; occupy spaces called lacunae
Structural unit of compact bone consisting of a central canal, surrounded by a number of concentric rings of bony matrix called lamellae.
Type of fibrous joint attaching a tooth to its socket; a type of syndesmosis
the irregular latticework of thin bony plates in spongy bone tissue
paranasal sinus
any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with lining of the nasal cavities; maxillae, frontal, ethmoid, and sphenoid bones
epiphyseal plate
cartilaginous area at the ends of long bones where lengthwise growth takes place in the immature skeleton; synchondrosis
immovable joints
Slightly movable joints
a soft, membrane-covered space between the bones at the front and the back of a newborn's skull
small canals radiating in all directions from launae, allowing for communication between osteocytes
intramembranous ossification
the process of bone formation in the flat bones of the skull, sternum, and clavicle, where bone forms directly within mesenchyme arranged in sheetlike layers that resemble membranes
appendicular skeleton
bones of the limbs and limb girdles that are attached to the axial skeleton
articular cartilage
hyaline cartilage covering bone ends at movable joints
cartilaginous joints
no joint cavity; bones held together by cartilage; examples: growth plates, disks between vertebrae and the pubic symphysis
central (Haversian) canals
longitudinal canal, carrying blood vessels and nerves; found at the center of an osteon
compact bone
hard, dense bone tissue, usually found around the outer portion of bones, diaphysis; contains osteons
epiphyseal line
a remnant of the epiphyseal plate; indicates long bone growth is completed
fibrous joints
bones are joined together by dense fibrous connective tissue, lack a joint cavity; sutures, syndesmoses, and gomphoses
concentric rings around the central canals of osteons
medullary cavity (marrow cavity)
cavity of long bones within the diaphysis; contains yellow marrow in adults
mature bone cells within lacunae organized around central canals
perforating (Sharpey's) fibers
collagen fibers running from periosteum into bone matrix; help to anchor periosteum
perforating (Volkmann's) canals
at right angles to the central canals; connects blood vessels and nerves of the periosteum and central canal.
red marrow
typically found within the trabecular cavities of spongy bone of long bones and in the diploe of flat bones; site of hematopoiesis
amphiarthrotic joint in which bones are joined by fibrous connective tissue; distal end of tibia and fibula.
osteogenic cell
bone stem cells, found in the membranous periosteum and endosteum, produce osteoblasts that later mature into osteocytes
flattened, shock-absorbing pads of fibrocartilage between the articulating surfaces of some joints
appositional growth
increase in bone thickness (width)
hormone that helps to increase blood calcium levels; stimulates osteoclast activity
hormone that helps to decrease blood calcium levels; stimulates osteoblast activity
yellow marrow
soft, fatty material found in the medullary (marrow) cavity of long bones; adipose tissue
multiaxial joint
type of diarthrosis; a joint that allows for movements within three planes (three axes)
uniaxial joint
type of diarthrosis; joint that allows for motion within only one plane (one axis)
biaxial joint
type of diarthrosis; a joint that allows for movements within two planes (two axes)
nonaxial joint
movement tends to be linear instead of angular; carpal to carpal or tarsal to tarsal joints
synovial membrane
lining of a joint capsule that secretes synovial fluid into the joint cavity
crista galli
superior projection in the middle of the cribriform plate of the ethmoid bone; attachment of the dura of the brain
articulations in the cranial bones; immovable joints; syndesmoses
growth hormone
hormone secreted by anterior pituitary gland that stimulates growth of bones; greatest during infancy and childhood
hyaline cartilage
most common type of cartilage; it is found on the ends of long bones, ribs, and nose; forerunner of long bones in the embryo