2010 BGD Practical 6 - Quiz: Difference between revisions

@@ Line 50: / Line 50: @@
 ||Only the vertebral column structures are formed from sclerotome. Dermis and skeletal muscle form from the dermomyotome, dividing into the dermatome (dermis) and myotome (skeletal muscle).
-{The extraembryonic coelom refers too
+{The intraembryonic coelom finally forms
 |type="()"}
-+ amniotic cavity, yolk sac and chorionic cavity
++ pericardial, pleural and periotoneal cavity.
-- pericardial cavity, pleural cavity and peritoneal cavity
+- single percardial cavity and two pleural and two periotoneal cavities.
-- blastocoel, somitocoel and lateral plate coelom
+- neural tube lumen, gastrointestinal tract lumen and neural crest.
-- maternal lacunae, uterine gland lumen, uterine body cavity
+- the paired dorsal aortas running the embryo.
-|| The extraembryonic coelom is the cavity lying outside the embryo forming the amniotic cavity, yolk sac and chorionic cavity. The intraembryonic coelom is the space inside the embryo lateral plate mesoderm forming the pericardial cavity, pleural cavity and peritoneal cavity. The blastocoel is the cavity inside the blastocyst before embryo formation. The somitocoel is the cavity forming inside the early somite before cell proliferation fills the space. The lateral plate coelom is the horseshoe space forming in the embryonic disc that gives rise to the the pericardial cavity, pleural cavity and peritoneal cavity. The maternal lacunae is the blood-filled space formed by the implantation process. The uterine gland lumen and uterine body cavity have nothing to do with embryonic spaces.
+|| The intraembryonic coelom finally forms the 3 P's. There is only one periotoneal cavity. These other anatomical spaces have noting to do with intraembryonic coelom. The dorsal aortas form within the splanchnic mesoderm.
-{Which of the following statements is incorrect about the process of gastrulation
+{Which of the following statements about placodes is most correct.
 |type="()"}
-- gives rise to the trilaminar embryo
+- placodes form as patches of mesoderm only in the head region
-- involves cell migration from the epiblast layer
+- placodes are part of the neural neural crest that will contribute to sensory structures
-+ extends from the primitive node to the buccopharyngeal membrane
++ placodes contribute the upper and lower jaw structures of the head
-- occurs at the region known as the primitive streak
+- placodes are associated with sensory development, except for hearing.
-- generates endoderm and then mesoderm layers
+- placodes are paired ectodermal regions.
-{What are the two main early embryonic developmental roles of the notochord
+|| Placodes are paired ectodermal regions forming in the head region during week 4 and contribute to each sensory system. Neural crest does associate with sensory development, but not as the placode. The upper and lower jaw form from two separate regions of the first pharyngeal arch: maxillary (upper) and mandibular (lower).
-|type="()"}
-+ mechanical role in embryonic disc folding and signaling for tissue patterning
-- formation of the nucleus pulposis and separating cloacal and buccopharyngeal membranes
-- gastrulation and neuralation
-- formation of the nucleus pulposis and intervertebral disc
-|| The notochord has a mechanical role in how the embryonic disc folds and releases a signal (sonic hedgehog) that patterns surrounding tissues. The nucleus pulposis does form from the notochord (much later in embryonic development) but the notochord does not separate the cloacal and buccopharyngeal membranes or form the intervertebral disc (from sclerotome of somite). Gastrulation and neuralation, you were asleep in the practical class or checking your facebook status.
-{Ectoderm refers only to the neural plate region of the trilaminar embryo
-|type="()"}
-- true
-+ false
-|| The entire layer of the trilaminar embryo is the '''ectoderm''' (meaning outer layer), the neural plate is only the central portion of this layer. Ectoderm forms the central [[N#neural plate|neural plate]] and the lateral parts form the [[E#epidermis|epidermis]].

Revision as of 16:12, 23 May 2010

Here are a few simple questions that relate to your BGD practical, this page is not a part of today's Practical class. You should try in your own time after completing the Practical today.Take the quiz and see what you know, if you get some wrong, try working through through the 2010 BGD Practical - Implantation to 8 Weeks.

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Point added for a correct answer:
Points for an incorrect answer:
Ignore the questions' coefficients:

1 Which of the following sequences of embryonic disc mesoderm is most correct:

	lateral to medial:extraembryonic - lateral plate - intermediate - paraxial
	lateral to medial: lateral plate - paraxial - intermediate - axial
	medial to lateral: notochord - somites - intermediate - lateral plate
	medial to lateral: paraxial - axial - intermediate - cardiac

2 During embryonic disc folding in week 3 only the ectoderm layer folds ventrally left, right and above and below the notochord.

	true
	false

3 Somites form regularly at the level of the body in the direction

	rostrocaudally
	caudorostrally

4 The intraembryonic coelom is a horse-shoe shaped cavity that develops in the lateral plate mesoderm from a series of smaller cavities fusing. Which of the following descriptions best describes the structure that then forms in this region.

	somatic mesoderm close to ectoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the endoderm.
	somitic mesoderm close to ectoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the endoderm.
	somatic mesoderm close to endoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the ectoderm.
	somitic mesoderm close to endoderm, the intraembryonic coelom and the splanchnic mesoderm closest to the ectoderm.
	intermediate mesoderm medially close to somites and laterally close to the intraembryonic coelom.
	none of the above.

5 Select the correct options below for the structures formed by sclerotome

	vertebra
	dermis
	limb bud cartilage
	intervertebral disc
	skeletal muscle

6 The intraembryonic coelom finally forms

	pericardial, pleural and periotoneal cavity.
	single percardial cavity and two pleural and two periotoneal cavities.
	neural tube lumen, gastrointestinal tract lumen and neural crest.
	the paired dorsal aortas running the embryo.

7 Which of the following statements about placodes is most correct.

	placodes form as patches of mesoderm only in the head region
	placodes are part of the neural neural crest that will contribute to sensory structures
	placodes contribute the upper and lower jaw structures of the head
	placodes are associated with sensory development, except for hearing.
	placodes are paired ectodermal regions.

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