Exam 1 - Bone Development/ Endochondral ossification Flashcards
what connective tissues do bones develop from
mesenchyme
what are the two processes by which bones develop from the mesenchyme
1 - intramemebranous ossification
2 - endochondral ossification
intramembranous ossification
1 step process mesenchyme —> into bone
mesenchymal model of the bone forms during the embryonic period
bones form during fetal period by direct ossification of the mesenchyme model
endochondral ossification
2 step process: mesenchyme —> cartilage —–> bone
cartilage model of the bone forms from mesenchyme during fetal period. most cartilage is replaced by bone
mesenchymal cells differ into ____
chondroblasts which form cartilaginous model of bone
what is the primary ossification made of
mid region of the model calcifies cartilage and capillaries grow into the calcified cartilage of the bone
bone tissue replaces most of the bone in the main body
how is the diaphysis made
shaft of the bone is ossified from the primary ossification center
where is secondary ossification centers
part os the developing bone, cartilage is replaced by bone and the parts of the bone formed is called epiphyses
when does diaphysis and epiphyses fuse
when the bone reaches adult size
Articulation joint
junction between two or more bones (hip bone and femur head)
fibrous joint
no joint cavity and have articulating bones held by fibrous CT
what are the three subtypes of fibrous joint
1 - suture
2 - syndesmosis
3. - gomphosis
suture
found in cranium. very short lengths. of fibrous tissue between bones
allow no movement
syndesmosis
united using a sheet of fibrous tissue either ligament or fibrous membrane
allows slight movement — the fibrous tissue holding ulnar and radius together in arm
gomphosis
dento-alceolar syndesmosis
between rt of the tooth and teh socket of the jaw
peg liek process is held into the socket - allows no movement
