L1A Theories of Growth Flashcards
Development
Increase in organization, complexity or specialization
Loss of potential
Gradient of growth
More growth toward mandible
Demonstrates different tissues grow at different rates
Scammon’s growth curve
Maxilla growth vs mandibular growth
Maxilla: follows neural
Mandible: follows general
Caniometry
Anthropometry
Measure of skull
Measure of head circumference
What type of growth does the cranial base exhibit
Interstitial growth
Interstitial growth steps
(Cartilage to cartilage) Resting cartilage cells Hyperplasia (prolieration) Hypertrophy (increase size) Secretion of ECM (NO BONE FORMATION)
Appositional growth steps
(Bone to bone) Resting cells in periosteum Hyperplasia Hypertrophy Secretion of ECM Mineralization
Endochondrial growth
(Cartilage to bone)
Ossification of cartilage
Chondrochranium
Ethmoid
Sphenoid
Basioccipital bones
Desmocranium
Cranial vault
Maxilla
Mandible
Intramembranous bone formation
(CT to bone?)
Secretion of bone matrix between CT membranes
Mandible forms by
Intramembranous bone formation
Cranial vault
Type of bones
Type of formation
Growth
Flat bones
Intramembranous
Appositional growth
Most important synchondrosis
Spheno-ethmoidal
Inter-sphenoidal
Spheno-occipital