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Development of the Nervous System - Coggle Diagram
Development of the Nervous System
Neural Tube Formation
gastrula stage
the part of the
ectoderm
that give rise
to the nervous system: the
neural plate
:knife_fork_plate:
formation of the
neural groove
(rostral to caudal); its walls are called the
neural folds
neural folds move together and fuse
dorsally
:back: - first in the middle, then A & P
neural tube!
later
CNS
common birth defect: failure of closure
failure in anterior end →
anencephaly
:skull:
failure in posterior end →
spina bifida
:money_with_wings:
circumvent: 0.4 mg of folic acid supplement before planning pregnancy
some neural ectoderm pinched off, lying just lateral to the neural tube
neural crest
later
PNS
develops in association with the underlying
mesoderm
forms prominent bulges on either side of the neural tube called
somites
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AKA:
neurulation
anterior end
Differentiation of 3 Primary Vesicles
💬
anterior to posterior
Prosencephalon/
Forebrain
Mesencephalon/
Midbrain
Rhombencephalon/
Hindbrain
differentiates into 3 important structures
cerebellum
:lips: (D)
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pons
(V)
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medulla oblongata
2 halves
rostral/A half
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caudal/P half
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also
ANS regulation
unlike forebrain, doesn't differentiate much
dorsal surface
tectum 🏠
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ventral surface (floor)
tegmentum
space in between
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conduit 🌉 for information passing from the spinal cord to the forebrain and vice versa
but also!
secondary vesicles sprout on both sides
optic
vesicles &
telencephalic
vesicles
optic vesicles
invaginate
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telencephalic vesicles
telencephalon
🧠
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diencephalon
in between
differentiates into
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space at the center of the diencephalon is the
third ventricle
>< :hole:
perceptions and cognition
info. flow to cortex
Thalamus
– internal capsule →
Cortex
info from cortex
opposite of the above
some go all the way to the spinal cord
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posterior end
Differentiation of the Spinal Cord
cavity of neural tube constricts
spinal canal
(teeny)
tissue surrounding it
gray matter :butterfly:
dorsal horn
intermediate zone
ventral horn
white matter 🔳
dorsal column 🧠
axons that carry sensory info. → brain
lateral columns
ventral column :runner:
axons of :arrow_down: corticospinal tract
act on cc bodies of
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How does the nervous system arise? What are the functions of the different intermediate developmental structures?