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Neuro-embryology
embryology essay
| Question | Answer |
|---|---|
| Neural crest cells give rise to what structures? | peripheral ganglia, schwann cells and afferent nerve fibers (as well as pigment cells of the skin, medullary cells of the adrenal gland, calcitonin cells of the thyroid gland, and many cranial nerve ganglia. |
| The PNS is derived from what 3 sources? | neural crest cells, the neural tube and mesoderm (Fix 67.) |
| The neural plate becomes the neural tube, which gives rise to the ___ | brain and spinal cord (Fix 67.) |
| Neural tube - gives rise to ____? | all preganglionic autonomic fibers and all fibers that innervate skeletal muscles. |
| Mesoderm - gives rise to _____? | the dura mater and to connective tissue investments of peripheral nerve fibers (endoneurium, perineurium, and epineurium) |
| These swellings eventually form the 3 primary brain vesicles ____? | the prosencephalic (forebrain), the mesencephalic (midbrain), and the rhombencephalic (hindbrain) areas. (Beck 24) |
| The 3 primary vesicles (stacked on top of each other like a triple decker icecream cone) give rise to the mature brain structures in the following way____? | The top and bottom vesicle divides, while the mesencephalon (the smallest of the three) remains undifferentiated. The prosencephalon becomes the telencephalon and diencephalon. The rhombencephalon becomes the myelencephalon and metencephalon. |
| How do the secondary vesicles of the neuraxis (which become visible at the 6th week) develop? Telencephalon----> | cerebral cortex / basal ganglia |
| How do the secondary vesicles of the neuraxis (which become visible at the 6th week) develop? Diencephalon-----> | pituitary gland / thalamus / hypothalamus |
| How do the secondary vesicles of the neuraxis (which become visible at the 6th week) develop? Mesencephalon-----> | corpora quadrigemina / red nucleus / substantia nigra |
| How do the secondary vesicles of the neuraxis (which become visible at the 6th week) develop? Metencephalon-----> | cerebellum / pons |
| How do the secondary vesicles of the neuraxis (which become visible at the 6th week) develop? Myelencephalon-----> | medulla oblongata |
Created by:
jasonsmithdc
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