LECTURE 3: embryology Flashcards
when is the PRE-EMBRYONIC STAGE
0-14 days
what are the 2 cell layers within the embryonic disk
ectoderm and endoderm
when is the EMBRYONIC STAGE
15 days - 8 weeks
where does the nervous system develop?
ectoderm
when is the FETAL STAGE
end of 8 weeks to birth
when does myelination start
after 8 weeks
when does the neural tube develop
days 18 to 26
where does the Neural plate forms longitudinally from
ectoderm
what makes the neural groove
edges of plate folds
when does the neural groove fold together and what does it form
day 21 and forms the neural tude
where does the neural tube close first
cervical region
the tubes Quickly fuses together rostrally/caudally with
open ends called
neuropores
where does the neural crest move
inside embryo
what cover the tube/crest
ectoderm
the superior neurpore closes when
day 27
the inferior neuropore closes when
day 30
Inner and outer cell layers are formed by the neural tube by day
26
where do the cell bodies become gray matter
inner layer
how does the tubes separate in the inner layer
dorsal/ventral sections
what is the ventral horn responsible for
motor
what is the dorsal horn responsible for
sensory
what does the outer layer of the neural tube do
processes cell bodies
what becomes white matter with axons and glial cells
the outer layer
what does the neural crest cells form
Peripheral sensory neurons
automatic neutrons
endocrine organs
Cells extend 2 processes, 1 to SC and 1 to dermal part of somite forming
dermatomes
Cell bodies of peripheral sensory neurons are ______ SC and in the _______
outside
dorsal root ganglion
