654458
Descrição
FlashCards por Thomas Welford, atualizado more than 1 year ago
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Criado por Thomas Welford
mais de 10 anos atrás
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| Questão | Responda |
| What does the phylogenic tree of neurones look like? | |
| What animals do not have electricatory excitable neurones with long processes? | Sponges and colonial flagelates |
| What is gastrulation? | The rearrangement of collection of cells into primary germ layers |
| What three layers of cells result from gastrulation? | Endoderm - inner Mesoderm - middle Ectoderm - outer |
| What happens before gastrulation? | Oocyte fertilisation Polarity established Cleavage - series of cell divisions |
| What are the two poles that form in a blastula? | Animal Vegetal |
| What is a cleavage? | Rapid cell division |
| What does a frog-blastula fate map look like? | |
| What is the point of initiation of gastrulation? | blastaphore - the small invagination in the otherwise smooth part of the blastula |
| What part of the blastula will reside in the centre? | Involuting marginal zone (IMZ) |
| Which cells the first cells to involute or last cells produce the head? | First cells = head Last cells = posterior regions |
| What does the neural plate become? What does it look like early on? | Forms neural tube by folding on itself Neural plate looks like resembles surface ectoderm |
| What is the neural tube responsible for? | All neurons/glia of vertebrates |
| What is the neural crest? | Another neurone/gial source Junction between the neural tube and ectoderm |
| What does the primitive streak become? | neural plate --> neural tube |
| In drosophila where does NS come from? | Ventrolateral part of the blastoderm |
| What is the ventral furrow? | initiation of gastrulation future mesoderm folds into interior of embryo |
| What happens to the neurogenic region as the mesodermal cells invaginate? | move most ventrally |
| what happens when the ventral furrow closes? | becomes the ventral midline (site of neurogenesis) |
| What is on either side of the ventral midline? | Neural ectoderm --> ventral nerve cord (CNS) |
| How is the cerebral ganglia produced? | a continuation of the neurogenic region into the anterior of embryo |
| What is the first morphological cue in drosphilia of neurogenesis? | In neurogenic region cells enlarge and move from outside layer to inside |
| At the beginning of neurogenesis is the neurogenic region a single layer? | YES |
| What is delamination? | num of cells in epithelium increase in size and undergo shape change and squeeze inside the blastoderm |
| What happens to the neuroblasts? | NB --> Ganglion Mother Cells (GMCs) --> Each cell generates pair of neurone or glia |
| What does a vertebrate neurone look like? | multi-polar e.g. myelin |
| What does an invertebrate neurone look like? | mono-layer |
| What is the difference to vertebrates and invertebrates with regards to CNS? | Vertebrate - spinal cord is dorsal to the gut Invertebrate - spinal cord is ventral to the gut |
| What is the difference to vertebrates and invertebrates with regards to CNS? (picture) | |
| What does oocyte fertilisation look like? and development of the human embryo? |
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