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basic body plan

vbms 260 - form and function

QuestionAnswer
ectoderm gives rise to neuroectoderm and surface ectoderm
mesoderm transforms into paraxial, intermediate and lateral plate mesoderm
endoderm develops into the gut tube and respiratory tract
changes in the ectoderm - formation of the primitive streak to neurulation -ectoderm proliferates to form neural plate/neuroectoderm -neural plate to neural groove -neural groove to neural tube (brain and spinal cord) PNS from neural tubes and neural crest cells -induction thickens surface ectoderm cells form placodes
placodes give rise to nasal chambers, eye lens, inner ear, cranial nerves, etc.
dorsal-ventral patterning of nerual tube requires two primary signalling centers: surface ectodermal cells -notochord
role of surface ectodermal cells in neurulation secrete bone morphogenetic protein (BMP) so some ectodermal cells become roof plate of tube
role of notorchord in neurulation Shh signalling from notochord produces floor plate of tube
neurulation folding of the neural plate into a nerual tube
embyro at stage of neuralation neurula
mesoderm based on location named as three: paraxial, intermediate and lateral
paraxial mesoderm gives rise to aggregation cells called somitomeres near the neural plate, and somites in the caudal region.
somitomeres give rise to structures in the head region and somites in the axial skeleton
intermediate mesoderm forms the reproductive and urinary system
lateral mesoderm forms the somatopleure and splanchnopleure which line the space in between the later turn into body cavities
from the mesodermal lining, a simple squamous epithelium develops, and it is called the mesothelium
mesothelium forms the serous membranes that line the body cavities (pleura, peritonium, percardium)
all connective tissue components are ______ in origin mesodermal
endoderm gives rise to epithelium of the gut and resp tract and their glands, bladder, middle ear, ear tube, liver, pancreas, thyroid and parathyroid glands
what are used to find the age of an embryo somites
Created by: deleted user
 

 



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