Endosketon Flashcards
Connective tissue functions
Bone and cartilage support the blood
Supportive structures
Structure of cartilage
Firm but flexible Chondrocytes, spaces within the matrix Chondroitin sulfate (ground sub) Avascular-thin Less organized Perichondrium-fibrous sheaths
Structure of bone
Calcium phosphate-in matrix Osteoblasts-prod. New bone Osteoclasts-removing old bone Strong flexible Vascular
3 classifications of cartilage
Hyaline cartilage
Fibrocartilage
Elastic cartilage
2 type of bone based on embryonic development
Endochondral bone-cartilage 1st replaced by bone
Intramembranous bone-no cartilage intermediate
(1st formative bone immature then mature bone)
Endochondral=endoskeleton
Development
From cartilage (template) from mesenchymal tissue then replacement by bone tissue
3 regions during endochondral development
Diaphysis-middle shaft
Epiphysis-each end
Epiphyseal plate(metaphysis)-b/w epi and shaft
Intramembranous bone dev
(Exoskeleton) skull&;shoulder
Directly from mesenchyme
Condensation of mesenchymal cells becoming rich with blood vessels
Intramembranous bone growth type (3)
Dermal bone
Sesamoid bone
Perichondral/periosteal bone
Describe dermal bone and example of it
Forms directly through ossification of mesenchyme.
Called dermal bone because the mesenchymal source of the bones of lies within the dermis of the skin
Skull, pectoral girdle & integuments are examples
Describe sesamoid bones and examples
Form directly within tendons, how are themselves derived from connective tissue
Patella and big toe
Describe perichondral and periosteal bone
Formed from the deep cell layer on the fibrous connective tissue Covering cartilage (perichondrium) or bone(periosteum)
What do the connective tissues consist of?
Bone, cartilage, fibrous connective tissue, adipose tissue, and blood
