Development of the Nervous Systems Chapter 3 Flashcards
How many stages are there in the development of the nervous systems?
6
what are the stages in the development of the nervous systems?
- Dorsal induction
- Ventral induction
- Neural Proliferation
- Neural Migration
- Cortical organization and Synapses Formation
- Myelination
When is the Dorsal induction ?
GA : 3-7 Weeks
what happens in Dorsal induction?
The neural Tube is formed
in the Dorsal induction how is the neural tube formed?
GA week 3 : the posterior part gets thick and Neural plate is formed
GA week 4: Neuroplate wraps around to form the euro tube
GA week 6: Both ends of the Neuro tube will close
what does Neurulation mean?
the Neuraltube wrapping around each other
What develops out of the neural tube?
The central nervous system
Why is dorsal induction such a critical period?
For the central nervous system to develop
What are three embryonic errors ?
- encephalopathy
- anencephaly
- spina bifida
when does ventral induction happen?
GA: 2-3 months
What happens during ventral induction ?
the face and brain develop out of superior end of the tube
what does Corpus Callosum mean ?
Dividing two hemispheres between and between the hemispheres will develop
in the Ventral induction what are the 3 primary divisions ?
- Prosencephalon
- mesencephalon
- rhombencephalon
what are the 2 secondary divisions of Prosencephalon?
- Telencephalon
2. diencephalon
What does Telencephalon make?
Cerebral Hemisphere
what are the 4 things diencephalon make?
- epithalamus
- thalamus
- hypothalamus
- neurohypophysis
what is the secondary division in mesencephalon?
mesencephalon
what does mesencephalon make ?
Midbrain
where is mesencephalon?
superior part of the brain stem
What are the 2 secondary division in rhombencephalon ?
- Metencephalon
2. myelencephalon
what does Metencephalon make?
Pons cerebellum
what does myelencephalon make?
Medulla
where is the Medulla ?
Most inferior part of the Brain stem
when does the Neural Proliferation happen?
GA: 3-4 months
