Term
Neural developement
(neural plate -> neurulation |
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Definition
neural plate folds outwards to form neural groove
Neural folds at edge of groove close to form neural tube
- occurs cr. to cd. starting in the neck region
formation of the neural tube is called neurulation |
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Term
Neural Development:
describe the neural tube & what happens to the anterior portion |
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Definition
ventral part is called the basal plate
- produces motor neurons
dorsal part is termed the alar plate
- produces interneurons (integrative)
hollow interior is designated the neural canal
- sensory neurons arise in the lateral plate folds
Anterior neural tube balloons into 3 primary vesicles (forebrain (proseencephalon), midbrain (mesencephalon), hindlimb (rhombencephalon) |
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Term
The anterior neural lube balloons into what 3 vesicles?
What does each become? |
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Definition
forebrain (prosencephalon) becomes:
- Telencephalon (cerebral hemispheres)
- Diencephalons (thalamic & hypothalamic optic centers)
- optic cup extends from diencephalon
midbrain (mesencephalon)
- mesencephalic aqueduct
hindbrain (rhombencephalon)
- metencephalon (cerebellum)
- myelencephalon (medulla oblongata) |
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Term
By the time the posterior end of the neural tube closes, _______________ have extended laterally from each side of the developing forebrain.
What occurs at this stage in neural development |
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Definition
the optic vessels
the brain undergoes proliferation, cell differentiation (neurons, glial cells) and cell migration
once the neurons have differentiated and reached their regional positions, they extedn axons and dendrites. |
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Term
| Most of the face, jaws and dorsal skull develop from what? |
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Definition
ectodermal neural crest cells that migrate from the anterior neuropore of the neural plate over the most cranial aspect of the embryo.
These cells will encase the brain, fortm the fronto-nasal prominence, and give rise to portions of the pharyngeal arches |
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Term
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Definition
| primordial cell masses that form around a central area of depression of the ectoderm at teh ventral aspect of the anterior end of the embryo called the stomadeum |
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