Summary The Developing Brain - Module 1

The Developing Brain
AB_1059

2023

Vrije Universiteit Amsterdam

Maaike Spaans



Module 1/3

Lecture slides, notes from lectures, and notes from Q&A sessions.

Grade: 8.1




1

,INDEX
Most lectures contain slides and notes. Lecture 12-14 (module 3) are notes only.

LECTURE 1: EARLY BRAIN DEVELOPMENT ............................................................................................. 3
LECTURE 2: TERATOGENS ..................................................................................................................... 27
LECTURE 3: KEYNOTE – INDUCED PLURIPOTENT STEM CELLS ............................................................ 39
LECTURE 4: AUTISM SPECTRUM DISORDERS ....................................................................................... 57
Q&A MODULE 1 ................................................................................................................................ 78




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,LECTURE 1: EARLY BRAIN DEVELOPMENT
Overview:

- This week: prenatal and early child brain development.
- This lecture: Normal embryonic development of the CNS and the changes in this process
that in many cases lead to gross malformations of the CNS.
- Later: disorders that become apparent during early childhood: autism.
- To understand these disorders -> cellular and molecular mechanisms that regulate prenatal
development of the nervous system.



Structure of the lecture:

- Chronological developmental processes:
o Neural induction + early patterning.
o Cell differentiation.
o Cell migration.
o Axon outgrowth.
- Chronologic stages of prenatal development of the CNS.
- Exam → understand what happens during these different stages.



NEURAL INDUCTION + EARLY PATTERNING

- The initial development of the nervous system starts at a very early embryonic stage (1st
week) with the process of gastrulation.
- Gastrulation refers to the formation of the 3 germ layers:
- Each germ layer gives rise to different tissues of the human body.
- Ectoderm gives rise to the nervous system.




Early development (notes):

- Cell can still develop into anything.
- Early cell is omnipotent (= (of a deity) having unlimited power).
- From blastocyst, cell’s eventual function is decided, what they form into.

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, Gastrulation:

- Gastrulation = formation of 3 germ layers (3rd week after fertilization).
- Endoderm = urinary, digestive and respiratory systems.
- Mesoderm = skeletal, muscular and cardiovascular systems.
- Ectoderm = skin (epidermis) and nervous system.




See video for movie of germ layers: https://canvas.vu.nl/courses/64814/pages/early-brain-
development?module_item_id=821677



Gastrulation (notes):

- Within this clump, the gastrulation process forms 3 layers. Cells migrate through the cleft
(see slide).
- Endoderm, inner layer, lowest layer.
- Mesoderm, in the middle.
- Ectoderm, outer layer.



Neurulation:

- Neurulation = formal of neural tube (=thick layer of neural stem cells).
- Steps: neural plate in ectoderm → folding of neural plate → neural tube.
- Central to the development of the nervous system is the formation of the neural plate and
eventually the neural tube = neurulation.



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