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MCBM 2 - Neurulation Questions with 100% Correct Answers
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MCBM 2 - Neurulation Questions with 100% Correct Answers
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1 of 96Definition
sources of mesoderm in embryo
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epithelium of alimentary (GI) canal; parenchyma (functional cells) of pancreas
and liver; thyroid, parathyroid; thymus; lung and trachea; middle ear epithelium;
urinary bladder and urethral epithelium; vaginal epithelium
, thicker than the original ectoderm, has a layer of actin filaments at the apical
surface that start contracting to initiate neural folding, causing the cells to take
on a pyramidal shape
dermamyotome layer of the somites
extra embryonic mesoderm from epithelium lining the yolk sac, secondary
mesoderm of gastrulation comes from the primitive streak, and secondary
mesoderm from neural crest cells
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2 of 96
Definition
how are muscle fibers formed?
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failure of formation of lamina and spine in lower thoracic / upper lumbar
vertebral column, causing herniation of dura and sometimes spinal cord
extra embryonic mesoderm from epithelium lining the yolk sac, secondary
mesoderm of gastrulation comes from the primitive streak, and secondary
mesoderm from neural crest cells
epithelium of alimentary (GI) canal; parenchyma (functional cells) of pancreas
and liver; thyroid, parathyroid; thymus; lung and trachea; middle ear epithelium;
urinary bladder and urethral epithelium; vaginal epithelium
, migrating myoblasts reach their destination then fuse to form a primary
myotube which starts growing and incorporating fetal myoblasts to
become a secondary myotube which eventually becomes a mature
skeletal muscle fiber which incorporates satellite cells when repair is
needed
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3 of 96
Definition
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IMAGE 5 IMAGE 2
IMAGE 12 IMAGE 13
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, 4 of 96
Definition
what happens to the original endoderm
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hypoblast - replaced by mesodermal cells; endoderm form epithelial
surfaces, but the supporting elements of any given organ are derived from
its mesoderm
neural folds come together and fuse (above the fusion point becomes
prosencephalon, below the spinal cord) - neural groove is now the neural tube,
space inside the neural tube is the neural canal
mesoderm - forms the skeletal and muscular systems
ectoderm - develops into the outer layer of the skin
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5 of 96
Definition
what does the neural crest give rise to?
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