lecture 7 Flashcards
when do critical periods occur
early years
differentiation eventually leads to
body and brain
how many distinct cell types are there in adult human
200
what happens 1 week after fertilization
brain and body develop from a single cell
cell proliferation
when does starting point of differentiation of cell types occur
at 8 weeks of postfertilization
what are the 6 stages of neural development
induction of neural plate neural proliferation migration axon growth and synaptic formation neuron death synaptic rearrangement
what does inner cell mass become
embryo
when does inner cell mass occur
day 5 ot 6 of postfertilization
can inner cell mass occur before implantation
yes
gastrulation reflects what
the creation of cellular layers
gastrulation consists of 3 layers of cells referred to collectively as
germ layers
what are the 3 germ layers
ectoderm
- develops into stuff on outside of body that interacts w external world
- PNS and CNS
mesoderm
- muscles, tissues and things just below skin
endoderm
- stomach, liver, thyroid, etc
the part of the ectoderm that becomes human nervous system has 2 features. what are they and what do they mean?
thickness
- thickness reflects start of neurogenesis
- leads to development of neural plate
striations
- organization of cell types determined by which striation cells are produced in
neural crest becomes ___
becomes all diff parts of peripheral nervous system
neural groove and its striations relevant for ___
relevant for production of neurons in central nervous system
