hold bones together at joints
attach muscles to bones
Functions of skeleton
support, protection, movement, electrolyte balance, acid-base balance, blood formation
Mineralization or calcification
hardening process of bone
protect soft organs, curved but wide and thin
longer than wide, rigid levers acted upon muscles
Equal in length and width, glide across each other in multiple directions
elaborates shapes that do no fit into other categories
external sheath that covers bone except where there is articular cartilage
thin layer of reticular connective tissue lining marrow cavity
Osteogenic (osteoprogenitor) cells
stem cells found in endosteum, periosteum, and in central canals
bone forming cells
former osteoblasts that have become trapped in the matrix they have deposited
tiny cavities where osteocytes reside
little channels that connect lacunae
bone-dissolving cells found on the bone surface
Ossification or osteogenesis
the formation of bone
In the human fetus and infant, bone develops by two methods
region of transition from cartilage to bone
the zone of transition facing the marrow cavity
bones increase in length
bones increase in width throughout life
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