Flashcards in LG 1.13 Early Development of the Nervous System Deck (31)
What happens at day 16-18?
Formation of neural plate
What happens at day 19-20?
Neural folds elevate
What happens at day 21-24?
Fusion of neural folds
What happens at day 25?
Cranial neuropore closes
What happens at day 27?
caudal neuropore closes
How does the ventricular system develop?
From the single cavity formed from the hollow neural tube
When is embryonic CSF formed?
What does the neural tube give rise to (general)?
What happens during gastrulation?
Converts the bilaminar embryo to a trilaminar embryo
Where does the notochord form?
On the midline of the mesoderm
What does the notochord induce growth of?
What is Neurulation?
Folding of neural plate in to a closed tube of ectoderm
What results from failure to close anterior neuropore?
- Failure to develop brain, cranial vault
What is spina bifida?
-Results from incomplete closer of the embryonic neural tube.
What are the types of Spina bifida?
- Meningocele: protrusion of meninges
- Meningomyelocele: protrusion of meninges and spinal cord
- Rachischisis: open neural tube
What is one method of preventing neural tube defects?
When does Segmentation of the CNS happen?
4th week, 3 primary brain vesicles are formed
When does myelination begin?
3rd trimester and continues after birth
When does the most brain growth occur?
What does the prosencephalon give rise to?
What does the mesencephalon give rise to?
What does the Rhombencephalon give rise to?
Metencephalon and mylencephalon
What does the telencephalon become?
What does the diencephalon become?
Thalamus and hypothalamus
What does the mesencephalon become?
What does the met encephalon become?
pons and cerebellum
What does the mylencephalon become?
What does the myelon become?
What 3 layers does the neural tube form?
1) Ventricular Layer
2) Mantle Layer (Gray matter)
3) Marginal Layer (white matter)
What arises from the neural crest?
• Cranial and sensory ganglia and nerves
• Medulla of suprarenal gland
• Pigment cells
• Pharyngeal arch cartilages
• Head mesenchyme and connective tissue
• Bulbar and truncal ridges in heart