A&P Ch.6 Skeletal System

Posted by admin on January 23, 2018 in flash cards

Term Definition
osteology the study of bone structure and the treatment of bone disorders
what are the six functions of the skeletal system support, protection of internal organs, movement, mineral homeostasis, hemopoiesis, storage of fat
support structural framework of soft tissues: tendon attachments
protection of internal organs cranium around the brain, thoracic cage around the heart
movement leverage for muscles
mineral homeostasis storage and release of calcium and phosphorus
hemopoiesis participates in blood cell production
storage of fat yellow marrow
how many bone structures ? 7
epiphysis either end of a long bone (proximal and distal)
Metaphysis where diaphysis and epiphysis meet
epiphyseal growth plate (growing bone only)
diaphysis shaft/body of a long bone
articular cartilage thin layer of hyaline cartilage covering epiphyses(reduces friction, absorbs shock)
periosteum tough ct covering outside of bone(Sharpey's perforating fibers) peeling a banana
medullary cavity marrow cavity contains Fat/Yellow Marrow and blood vessels in adults.lightens weight of bone-max strength, min weight
endosteum thin membrane inner lining of medullary cavity (fat)
how many bone cells? 3
osteoBlast (Young), immature bone building cells
osteoCytes (Adult), Mature cells maintain hardened bone
osteoClast (Older), resorption of bone matrix to release calcium(breaks down)
calcification hardness of bone(makes bone hard)
flexibilty tensile strength depends on collagen fibers
mineral salt deposited in extracellular MatrixHydroxyapatite-recipe of salt
compact bone protection and support (Hard), outside layer of bone
spongy bone light weight and provides tissue support( inside layer of bone)
compact (cortical) bone 80% of skeleton
osteton structural units of bone
central canal contains arteries and veins
concentric lamellae circular rings of matrix
lacunae "little lake" for osteocytes to live in
canaliculi "small channels" (how osteocytes breath/eat/connect)
fossa shallow, basin like depression
condlyle rounded articular projection
epicondyle raised area above a condlyle
head bony expansion on a narrow neck
trochanter large, blunt, irregular surface
tuberosity rounded projection
process any bony prominence
crest narrow, prominent ridge of bone
line narrow ridge of bone
fovea small pit like indent
tubercle small rounded projection
ramus arm like bar of bone
spine sharp,slender projection
foramen round or oval opening through a bone
fissure narrow, slit like opening
meatus canal-like passage
sinus space within a bone
osteoporosis severe bone loss
osteopenia thinner and weaker with age (between 30-40 yrs old)

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