Craniofacial development Flashcards
when is prenatal development?
1st week
when is the embyronic period
week 2-8
what is induction?
process where an undifferentiated cell (e.g. mesenchymal cell) is instructed by specific organisers to produce a morphogenic effect.
what is cell proliferation?
controlled cellular growth and accumulation of byproducts
what is cell differentiation?
change in identical embryonic cells to become distinct functionally and structurally
what is cytodifferentiation?
the development of different cell types
what is histodifferentiation?
the development of different histological tissue types within a structure e.g. tongue, palate
what is morphodifferentiation?
developing of the differing morphology which makes up its structure or shape for each organ or system.
what is morphogenesis?
development of specific tissue structure or differing form due to embryonic cell migration and proliferation and inductive interactions
what is maturation?
attainment of adult function and size due to proliferation, differentiation and morphogenesis
what forms in the 2nd week?
embryonic (germ) cell layers
bilaminar embryonic disk
what are the 4 embryonic (germ) cell layers?
ectoderm
mesoderm
endoderm
neural crest cells
what is the origin and future structure of the ectoderm?
Origin -> epiblast layer
Future structure -> epidermis
what is the origin and future structure of the mesoderm?
Origin -> migrating cells from epiblast layer
Future structure -> dermis, muscle, bone
what is the origin and future structure of the endoderm?
Origin -> migrating cells from epiblast layer
Future structure -> respiratory and digestive linings
what is the origin and future structure of the neural crest cells?
Origin -> migrating cells from neuroectoderm
Future structure -> nervous system, connective tissue, cartilage, bone
what is the bilaminar embryonic disk and what does it develop from?
Is a circular plate of bilayered cells
Develops from blastocyst
what happens in the 3rd week of embryonic period?
bilaminar disk thickens and becomes trilaminar embryonic disk
Epiblast layer now considered ectoderm due to development of mesoderm and endoderm
what happens in the 4th week?
Embryonic folding -> hard tissue formation starts in response to signals from neural crest cells
4th week
what is sequential interaction?
timing of events
4th week
what is reciprocal interaction?
one in control of another
4th week
what is dynamic interaction?
happens quickly
define instructive tissue interactions
one tissue determines the development of another tissue
define permissive tissue interactions?
one tissue provides certain conditions required for its partner tissue to progress
