Cranial Placodes II

jambomber's version from 2015-05-06 10:34


Question Answer
What do the cranial placodes contribute to?Sensory ganlia, Paired sensory organs and part of the pituitary gland
How are cranial placodes similar to NCC's?Tge are both derived from the ectoderm at the border of the neural plate, produce multiple non epidemral cell type and undergo cell shape changes + migration
What sets placodes apart from NC?THey occur exclusively in the cranial ectoderm, have more restricted devo potential and the process of asseembling stuctures is heterogeneous
What are some difference in placodes b/w lineagesLateral line in non amniotes, neurogenic + hypobranchial in Xenopus
What unites placodes morphologically?Regions of cell proliferation, shape changes (both cellular and tissue level) almost all neurogenic except Lens + adrenohyphesal
What is evidence for a common origin?Fate maps sugest all derive from horshoe regions in outer neural folds
What genes are implicated in placode devo?Ones whose pertubations result in deformed placodes
How would I describe lateral lineA sensory system dedicated to detecing movement or current in water. Originally 6X lat line placodes
What nerves does the epibranchial placode genereate? What are their functionsGenticulate, Pertosal and nodose. Viscero sensory. _ innervate non placodal sensory receptors in tongue
What does the adrenohypophesal placode gen?Anterior lobe of pit. Involved in hormonal control of bodily funtions
What does olfactory plac genGnRH glial cells and olfactory + vomeronasal epithilia
What is the profundal placode? Anamniote feature Generatess progundal + trigeminal ganglia. Trigeminal in mammals = Convergence of opthalmic and maxomandibullar nerves- placode homology?

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