L8 human embryology and developmental biology
14 important questions on L8 human embryology and developmental biology
Was is the first step in gastrularion, so in forming the three germlayers?
So of what cells does the embryo actually exists?
What will neuralcrest cells become?
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Folic acid is important during pregnancy for?
At which zone of the neural tube happend most division?
From what type of germlayer is the posterior and anterior pituitary formed?
In the mesencephalon the motor and sensory tracts are formed. Which one is ventral and which dorsal?
Motor = ventral (basal plate)
DA BV
Which structure develops into the three germ layers?
Differentiation of the three germ layers
epidermis, hair, nails, inner ear, lens, nervous system anterior hypofyse.
Mesoderm:
Epimere (praxial - somites) -> muscles, skeleton, dermis, connective tissue
Mesomere (intermediate) -> urogenital system
Hypomere (later plate) -> muscles, blood/lymphe, spleen, connective tissue, adrenal
Endoderm:
-epithelium of respiratory system
- epithelium of gut, liver, pancreas and urinary tract
- epithelium of pharynx, thyroid, tonsils, inner ear
<- picture: cell and tissue lineages in the mammalian embryo
Development human CNS
Consists of multiple sheets of ectoderm
What are the 5 vesicle of the developing brain?
Diencephalon
Mesencephalon
Metencephalon
Myecephalon
Out of which structure (brain vesicle) does the pituitary develop?
The posterior lobe forms from a diverticulum of the diencephalic floor called the infundibulum, whereas the anterior lobe and pars intermedia form from an evagination of the ectodermal roof of the stomodeum called Rathke's pouch. Rathke's pouch detaches from the stomodeum and becomes associated with the developing posterior pituitary.
Again multiple sheets of ectoderm........
So:
Posterior lobe <- diverticulum diencephalic floor/infudibulum
Anterior lobe/pars intermedia <- evagination of ectodermal roof of stomodeum/Rathke's pouch.
Medial view of developing brain
Cerebral hemispheres and development
Weetje:Cerebral convolutions
the reason your cerebral cortex has so many folds, like wrinkled-up walnut, is that there is a limited amount of space inside your skull. By wrinkling up, the cortex creates more space to fit in more neurons.
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