katelynmaria02
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Relevant questions from the oldies. May not be all inclusive, just what I found. If you see any problems or anything please e-mail me at katelynmaria02@gmail.com and I will try to make corrections.

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katelynmaria02
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Embryology Midterm

Frage 1 von 43

1

Fertilization typically occurs in the:

Wähle eine der folgenden:

  • ovary

  • uterus

  • ampulla of the oviduct

  • isthmus of the oviduct

  • vagina

Erklärung

Frage 2 von 43

1

The zona pellucida:

Wähle eine der folgenden:

  • is located between the oocyte and granulosa cells

  • hardens to provide a block to polyspermy

  • prevents premature (ectopic) implantation

  • all of the above

  • none of the above

Erklärung

Frage 3 von 43

1

Where in the developing embryo is the mesoderm layer absent so that there is no separation bewteen the ectoderm and endoderm layers?
1. oral plate
2. cardiac plate
3. cecal plate
4. lateral plate

Wähle eine der folgenden:

  • 1 & 2

  • 1 &3

  • 2 & 3

  • 2&4

  • 1,2,&3

Erklärung

Frage 4 von 43

1

Within the trunk of the developing embryo, paraxial mesoderm breaks up into:

Wähle eine der folgenden:

  • thin layers called the intermediate mesoderm

  • thick layers called the lateral plate

  • somitomeres consisting of somitomere components

  • somites consisting of sclerotome, dermatome, and myotome components

Erklärung

Frage 5 von 43

1

During development Meckel's cartilage is known to become a portion of the:

Wähle eine der folgenden:

  • chondrocranium

  • neurocranium

  • mandible

  • maxilla

Erklärung

Frage 6 von 43

1

The first branchial arch gives rise to:

Wähle eine der folgenden:

  • muscles of mastication

  • part of the tongue

  • nasal septum

  • muscles of facial expression

  • a & b

Erklärung

Frage 7 von 43

1

At the beginning of the blastocyst stage there is:

Wähle eine der folgenden:

  • development of a fluid filled cavity called the amnion

  • formation of an inner cell mass which becomes the trophoblast

  • formation of an outer cell mass which becomes the embryoblast

  • all of the above

  • none of the above

Erklärung

Frage 8 von 43

1

At the earliest stage of development the primitive stomadeum is bounded by the (May/ may not be relevant for this exam):

Wähle eine der folgenden:

  • maxillary and mandibular prominences

  • the frontonasal prominence and mandibular prominence

  • the frontonasal prominence and cardiac bulge

  • the median nasal prominences and mandibular process

  • the maxillary and median nasal prominences and mandibular process

Erklärung

Frage 9 von 43

1

The muscle of the gut wall is embryonically derived from:

Wähle eine der folgenden:

  • sclerotome

  • myotome

  • dermatome

  • intermediate mesoderm

  • lateral plate mesoderm

Erklärung

Frage 10 von 43

1

The mesodermal layer of the embryo:

Wähle eine der folgenden:

  • arose from ectodermal cells of the epiblast

  • forms blood vessels and most of the heart

  • forms cartilage and bone

  • all of the above

  • none of the above

Erklärung

Frage 11 von 43

1

During development the amnion and yolk sac are in temporary communication. This opening is:

Wähle eine der folgenden:

  • allantois canal

  • neurenteric canal

  • Caso's canal

  • umbilicus

  • reichert's membrane

Erklärung

Frage 12 von 43

1

Neural crest cells can form or become all of the following except:

Wähle eine der folgenden:

  • bone

  • cartilage

  • myelin

  • neurons

  • olfactory sensory cells

Erklärung

Frage 13 von 43

1

Secretions of epithelial cells of the oviduct:

Wähle eine der folgenden:

  • provide nutritional material for the conceptus

  • together with cilia establish an outward flow that inhibits bacterial migration toward the peritoneal cavity

  • produce a current that helps orient spermatozoa

  • all of the above

  • none of the above

Erklärung

Frage 14 von 43

1

Progression from the 2-cell stage to the morula is called:

Wähle eine der folgenden:

  • implantation

  • neurulation

  • cleavage

  • gastrulation

  • insemination

Erklärung

Frage 15 von 43

1

Which of the following is incorrect regarding the notochord?

Wähle eine der folgenden:

  • arises from a notochordal process which at first is a hollow tubular structure

  • is formed during gastrulation

  • arises from the primitive pit

  • divides the developing embryo into cephalic and caudal halves

  • lies along the long axis of the embryo

Erklärung

Frage 16 von 43

1

THe muscles of mastication arise from mesenchyme of the _________ branchial arch.

Wähle eine der folgenden:

  • first

  • second

  • third

  • fourth-sixth

Erklärung

Frage 17 von 43

1

In the following list of events or stages, which of event would be third: Morula, Fertilization, Graffian follicle, Hatching, Implantation?

Wähle eine der folgenden:

  • morula

  • fertilization

  • graafian follicle

  • hatching

  • implantation

Erklärung

Frage 18 von 43

1

Which of the following is a false statement?

Wähle eine der folgenden:

  • the zona pellucida is a matrix layer between the follicular epithelium and oocyte

  • a function of zona pellucida is to prevent premature implantation

  • zona pellucida encircles the morula

  • zona pellucida is surrounded by granulosa cells

  • zona pellucida is removed immediately following fertilization

Erklärung

Frage 19 von 43

1

Transport of the ovum is facilitated by:

Wähle eine der folgenden:

  • the activity of cilia in the uterine tube

  • peristalic contractions of the muscularis of the uterine tube

  • the presence of active flagella in cells of the corona radiata

  • all of the above

  • a & b

Erklärung

Frage 20 von 43

1

Meiosis is completed prior to ovulation.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 21 von 43

1

The syncytiotrophoblast is derived from the outer cell mass while the cytotrophoblast is derived from cells of the inner cell mass.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 22 von 43

1

Alveolar bone is formed from:

Wähle eine der folgenden:

  • mesenchyme derived from somites

  • epithelium from the oral ectoderm

  • mesenchyme from the primitive streak

  • mesenchyme from notochord

  • none of the above

Erklärung

Frage 23 von 43

1

The folding of the embryo causes:

Wähle eine der folgenden:

  • endoderm to be on the inside of the embryo

  • ectoderm to be on the inside of endoderm

  • endoderm to be on the outside of the mesoderm

  • mesoderm to be on the outside of the ectoderm

Erklärung

Frage 24 von 43

1

From which embryonic layer is mesoderm derived?

Wähle eine der folgenden:

  • epiblast

  • hypoblast

  • endoderm

  • neuroectoderm

Erklärung

Frage 25 von 43

1

Hatching occurs:

Wähle eine der folgenden:

  • during implantation

  • in the ampulla of the oviduct

  • prior to blastocyst formation

  • during the morula stage

  • none of the above

Erklärung

Frage 26 von 43

1

Which of the following statements concerning prenatal development is correct?

Wähle eine der folgenden:

  • most congenital malformations occur during the last prenatal week

  • maturation of existing structures occurs during the second to eighth week

  • initiation of embryonic layers occurs during the first week

  • the fetus is the structure present during embryonic period

Erklärung

Frage 27 von 43

1

The oral plate consists of:

Wähle eine der folgenden:

  • embryonic endoderm, mesoderm, ectoderm

  • a circular area anterior to the notochord in which the endoderm is fused to the embryonic mesoderm

  • the cloacal membrane and the overlying amnion

  • endoderm of the roof of the yolk sac and embryonic ectoderm

  • the cardiogenic mesoderm and the neuroectoderm

Erklärung

Frage 28 von 43

1

The first brachial arch gives rise to:

Wähle eine der folgenden:

  • muscles of mastication

  • maxillary teeth

  • mandibular teeth

  • malleus

  • all of the above

Erklärung

Frage 29 von 43

1

Somites form from:

Wähle eine der folgenden:

  • ectomesenchyme

  • intermediate mesoderm

  • lateral plate mesoderm

  • paraxial mesoderm

Erklärung

Frage 30 von 43

1

Which of the following cells have migrated from the neuroectoderm and are the basis for future bone of the maxilla and mandible?

Wähle eine der folgenden:

  • sclerotome

  • trophoblast

  • mesodermal

  • neural crest

  • endodermal

Erklärung

Frage 31 von 43

1

Embryologically the muscular wall of the gut arose from the:

Wähle eine der folgenden:

  • endoderm

  • parietal lateral plate mesoderm

  • visceral lateral plate mesoderm

  • somatic myotome

  • intermediate mesoderm

Erklärung

Frage 32 von 43

1

The cells of the _______ will form the embryo proper.

Wähle eine der folgenden:

  • inner cell mass

  • cyrotrophoblast

  • outer cell mass

  • syntiotrophoblast

Erklärung

Frage 33 von 43

1

At the beginning of the third week of development a thickening of ectoderm overlying the notochord indicates the start of:

Wähle eine der folgenden:

  • cleavage

  • gastrulation

  • primitive streak stage

  • neurulation

  • somite formation

Erklärung

Frage 34 von 43

1

Prior to the formation of the primitive streak the amnion and blastocystic cavity (yolk sac) communicate via the neuroenteric canal.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 35 von 43

1

Regarding the early embryo, which of the following is False?

Wähle eine der folgenden:

  • the epiblast faces the amniotic cavity

  • the embryonic shield consists of 2 layers prior to the formation of the primitive streak

  • following gastrulation mesoderm fills all the space between the ectoderm and endoderm

  • the hypoblast cells are primitive endoderm

Erklärung

Frage 36 von 43

1

Which of the following is Incorrect regarding the notochord?

Wähle eine der folgenden:

  • it arises from a notochordal process which at first is a hollow tubular structure

  • it is formed during gastrulation

  • arises from the primitive node

  • it extends from the primitive pit in a caudal direction

  • divides the developing embryo into right and left halves

Erklärung

Frage 37 von 43

1

Conceptus includes:
1. extraembryonic structures derived from the zygote
2. embryonic structures derived from the zygote
3. chorion
4. syncytiotrophoblast

Wähle eine der folgenden:

  • 1

  • 1, 2, & 3

  • 1 & 3

  • all of the above

  • none of the above

Erklärung

Frage 38 von 43

1

Down syndrome is known for:

Wähle eine der folgenden:

  • trisomy of chromosome number 20

  • production of a monosomy situation

  • facial enlargement and lengthened palate

  • fissured tongue and delayed tooth eruption

Erklärung

Frage 39 von 43

1

Which of the following supports the primitive embryo and is directly derived from ectoderm alone?

Wähle eine der folgenden:

  • notochord

  • prochordal plate

  • secondary yolk sac

  • cardiac plate

Erklärung

Frage 40 von 43

1

Which of the following syndromes occurs due to failure of neural crest cells to migrate?

Wähle eine der folgenden:

  • Downs syndrome

  • Fetal alcohol syndrome

  • Asperger syndrome

  • Treacher Collins syndrome

Erklärung

Frage 41 von 43

1

The face develops in the human between:

Wähle eine der folgenden:

  • 6 and 10 days

  • 10 and 22 days

  • 12 and 22 days

  • 24 and 38 days

Erklärung

Frage 42 von 43

1

Primitive oral cavity is called?

Wähle eine der folgenden:

  • primitive choana

  • buccopharingeal membrane

  • stomatodeum

  • foregut

  • none of these

Erklärung

Frage 43 von 43

1

Proteins that bind to specific DNA sequences and regulate transfer of genetic information from DNA to mRNA are called:

Wähle eine der folgenden:

  • growth factors

  • transcription factors

  • receptors

  • messengers

Erklärung

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