Chap. 2- Development Flashcards
(39 cards)
What is the wall of the primitive neural tube called?
Germinal neuroepithelium
What is the primitive neural tube made up of?
Periventricular and subpial zone
What are the cells of asymmetric division?
Radial glial cells, basal progenitor and neuroblast
What does a radial glial cell produce?
More radial glials, basal progenitors and neuroblasts
What do nasal progenitor cells produce?
Astrocytes, oligodendrocytes and neurons
Where does tangential migration happen and what happens?
Neuroblasts move parallel to pial surface to remain subpial or deeper.
- Rhombic lips with cerebellum, midbrain- substantia nigra, brainstem- cuneate, olivary, pontine and tegmental reticular nuc, spinal cord and tel with basal nuclei
Where is the process of neurogenesis and neuronal migration throughout adult life?
Subventricular zone and in granular cell layer of dentate gyrus in hippocampus
Precursors are glial
Where is the mantle layer in the spinal cord?
Newly formed cells migrate to establish this layer around the neural tube
- formed by neurons and glia
What layer becomes the white matter in spinal cord?
Marginal
What does the underlying germinal epithelium become in spinal cord?
Ventricular or ependymal layer
What half is sensory and what is motor in spinal cord and in mantle layer?
Dorsal- sensory- alar
Ventral- motor - basal
What makes division between alar and basal?
Sulcus limitans
What marks the division between tel and di?
When optic vesicles develop and the pros vesicle begins to develop
What does the rhomb become?
Met and mye
Met is pons and cerebellum
Mye is medulla
What are the three flexures that form in order?
- Mesenchephalic- ventral
- Cervical
- Pontine
Where are the dendrites and axons of the purkinje cells?
Dendrites- molecular layer
Axons- directed to nuclei
Where do the choroid plexus develop?
- medial aspect of each developing telencephalic vesicle
- roof of the third and fourth ventricles
What is the tela choroidea?
Where pia mater contact ependymal cell layer
This and blood caps form the choroid
Where is the choroid located?
- inside lateral ventricles and extend through interventricular foramen to third ventricle and on its roof
- more develop on fourth ventricle causally to caudal medullary velum
What forms the somitomeres?
Paraxial mesoderm
What does the somitomere that is lateral to the developed encephalon form?
Cranial muscles, most of the neurocranium and dermal and meningeal tissues
What does the neural crest in the head contribute to?
Formation of the splanchnocranium with the mandible and hyoid bone, connective tissue of head muscles and to wall of blood vessels
What does the somitomere become caudal to the seventh one?
Somite
What are the three regions of a mature somite?
Dermatome, sclerotome, and myotome
