Bone Anatomy

Question 1

which one is mature and immature:

woven or lamellar?

Answer 1

woven = immature

lamellar = mature

Question 2

when is woven produced ?

which condition is woven bone produced in?

Answer 2

when osteoblasts produce osteoid rapidly - which occurs in some metabolic bone disease with high bone turnover: Paget’s

Question 3

fetal bones: woven or lamellar?

Answer 3

woven

Question 4

when are fetal woven bones replaced by lamellar?

Answer 4

third trimester

Question 5

what % of adukt skeleton is made up of cortical bone?

Answer 5

80%

Question 6

function of osteoblasts?

Answer 6

(make bone)
bone forming cells
make osteoids - type 1 collagen

Question 7

function of osteocytes?

Answer 7

(are bone)
responsible for calcium and phosphate metabolism

mature cells

Question 8

function of osteoclasts?

Answer 8

(destroy bone)

resorb bone

Question 9

how can you tell on an Xray if they are skeletally mature or immature?

Answer 9

presence of growth plates

Question 10

what is endochondral ossification?

what is intramembranous ossification?

Answer 10

production of long bones

production of flat bones (skull)

Question 11

what is achondroplasia?

Answer 11

dwarfism (abnormal endochrondral ossification)

normal spine but long lbones are short