Skeletal Flashcards
what tissues compose the skeletal system?
cartilage, nerve, dense connective, epithelium, adipose, bone tissue, blood forming tissue
what are the function of bones?
storage, structure, protection, shape, mobility, blood formation, supports
name the parts of the outer bone regions
proximal epiphysis, metaphysis, disaphysis, metaphysis, distal epiphysis
name the parts of the inner bone
articular cartilage, epiphyseal line, spongy bone, compact bone, endosteum, periosteum, nutrient artery, medullary cavity
what is the study of bone and the treatment of bone structure called?
osteology
in a growing bone the metaphysis contains?
epiphyseal plate
what is the epiphyseal plate a layer of?
Hyaline cartilage
the articular cartilage is composed of _____ which lacks _____ and ____ therefore ____ is limited
hyaline cartilage, perichondondrium, blood vessels, repair
what is periosteum
layer of tough connective tissue therefore the blood supply
the inner layer of periosteum is? what is the inner layer called?
celles - osteogenic layer
the outer layer of periosteum is? what is the outer layer called?
dense irregular tissue - fibrous layer
what is the medullary cavity composed of?
fatty yellow bone marrow and blood vessels
why is bone considered connective tissue?
because it is cells separated by a hard matrix
what are the cells of the bone?
osteogenic, osteoblast, osteocyte, osteoclast
what are the characteristics of osteogenic calls?
- stems cells that come from mesenchyme 2. only bone cell to divid into itself or osteoblasts
where are osteogenic cells found?
under periosteum and endosteum
what are the characteristics of osteoblasts?
- bone building cells 2. synthesizes and secrete collagen fibers, organic compound (matrix), initiates calcification 3. they cannot divide
where are osteoblasts found?
under periosteum and endosteum
when does osteoblast turn into osteocytes?
when they get trapped in their matrix called lacunae
what is the histology of bone?
connective tisse separated by hard matrix
what does osteocytes do?
maintain bone tissue but cannot divide
what are the characteristics of osteoclasts?
- formed from WBC 2. found under endostreum and periosteum 3. secretes enzymes and acids to break down matrix
what are the functions of osteoclasts?
growth, break down matrix, repair, maintaining, remodelling
how does bone cells get oxygen and nutrients from blood?
through interstitial fluid
what is the bone matrix composed of?
15% water, 30 % organic matrix (collagen fibers), 55% inorganic matrix (mineral salt)
what is mineralization?
hardening of tissue when mineral crystals deposit around collagen fibers
what are the characteristics of compact bone?
solid hard layer of bone, makes up shaft of hard bone and outer layer of all bones, resists stress, composed of osteons
what is the lamella?
concentric rings surrounding a haversian canal
what is a haversian canal?
spaces in lamella that contains vessels, nerves that supplies oxygen and nutrients