5084891
Question 1
Question
The primitive streak begins at the cranial end and progresses towards the caudal end. The epiblast cells of the primitive streak form a node and displace the hypoblast to give rise to endoderm.
Answer
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Both true
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First true, second false
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First false, second true
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Both false
Question 2
Question
Which of the following is correct?
Answer
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The oropharyngeal membrane becomes the stomodeum
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The cloacal membrane will become the anus
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cells at the node move posteriorly to form the notochord
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all of the above
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only the ones about membranes
Question 3
Question
Which of the following are derivatives of the neural crest cells?
Answer
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odontoblasts
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craniofacial skeleton
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adrenal medulla
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all of the choices
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adrenal medulla and odontoblasts
Question 4
Question
Noggin, chordin, and follistatin are secreted by the dorsal mesoderm/notochord. They serve as inhibitors of BMP4 of the neural plate to convert ectoderm into neural tissue.
Answer
-
Both true
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First true, second false
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First false, second true
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Both false
Question 5
Question
Which of the following is incorrectly matched?
Answer
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anterior pituitary from Rathke's pouch
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melanocytes from neural crest
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dentine of teeth from neural crest
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these are all right.
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facial cartilage from neural crest
Question 6
Question
Neural tube closure is initiated at the future midbrain and closure goes in both directions. The order of formation is elevation, folding, convergence, closure.
Answer
-
Both true
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First true, second false
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First false, second true
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Both false
Question 7
Question
Which of the following is correct?
Answer
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Cranial NC is derived from hindbrain, does craniofacial skeletal elements
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Sacral NC becomes parasympathetic enteric ganglia of the gut
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Vagal NC becomes parasympathetic enteric ganglia of the gut
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All of the things
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Vagal and Cranial
Question 8
Question
Which of the following is incorrect?
Answer
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DiGeorge has a large deletion in Tbx1 from large deletion in chromosome 22
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Hirschsprung has mutations in Sox10 and Endothelin receptor B causes megacolon, pigmentation defects, and deafness
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Treacher Collins involves mutations in TCOF1 leading to small jaws, cleft palate, and defects of the middle and external ear
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none, it's all good.
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Neurocristopathies are defects specifically of the neural crest cells themselves
Question 9
Question
The trigeminal placode includes the opthalmic ganglia. The epibranchial placode includes the geniculate, petrosal, and nodose ganglia which are all associated with CN10.
Answer
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Both true
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First true, second false
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First false, second true
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Both false
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