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

Embryology Midterm

Questão 1 de 43

1

Fertilization typically occurs in the:

Selecione uma das seguintes:

  • ovary

  • uterus

  • ampulla of the oviduct

  • isthmus of the oviduct

  • vagina

Explicação

Questão 2 de 43

1

The zona pellucida:

Selecione uma das seguintes:

  • 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

Explicação

Questão 3 de 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

Selecione uma das seguintes:

  • 1 & 2

  • 1 &3

  • 2 & 3

  • 2&4

  • 1,2,&3

Explicação

Questão 4 de 43

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 5 de 43

1

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

Selecione uma das seguintes:

  • chondrocranium

  • neurocranium

  • mandible

  • maxilla

Explicação

Questão 6 de 43

1

The first branchial arch gives rise to:

Selecione uma das seguintes:

  • muscles of mastication

  • part of the tongue

  • nasal septum

  • muscles of facial expression

  • a & b

Explicação

Questão 7 de 43

1

At the beginning of the blastocyst stage there is:

Selecione uma das seguintes:

  • 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

Explicação

Questão 8 de 43

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 9 de 43

1

The muscle of the gut wall is embryonically derived from:

Selecione uma das seguintes:

  • sclerotome

  • myotome

  • dermatome

  • intermediate mesoderm

  • lateral plate mesoderm

Explicação

Questão 10 de 43

1

The mesodermal layer of the embryo:

Selecione uma das seguintes:

  • 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

Explicação

Questão 11 de 43

1

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

Selecione uma das seguintes:

  • allantois canal

  • neurenteric canal

  • Caso's canal

  • umbilicus

  • reichert's membrane

Explicação

Questão 12 de 43

1

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

Selecione uma das seguintes:

  • bone

  • cartilage

  • myelin

  • neurons

  • olfactory sensory cells

Explicação

Questão 13 de 43

1

Secretions of epithelial cells of the oviduct:

Selecione uma das seguintes:

  • 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

Explicação

Questão 14 de 43

1

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

Selecione uma das seguintes:

  • implantation

  • neurulation

  • cleavage

  • gastrulation

  • insemination

Explicação

Questão 15 de 43

1

Which of the following is incorrect regarding the notochord?

Selecione uma das seguintes:

  • 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

Explicação

Questão 16 de 43

1

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

Selecione uma das seguintes:

  • first

  • second

  • third

  • fourth-sixth

Explicação

Questão 17 de 43

1

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

Selecione uma das seguintes:

  • morula

  • fertilization

  • graafian follicle

  • hatching

  • implantation

Explicação

Questão 18 de 43

1

Which of the following is a false statement?

Selecione uma das seguintes:

  • 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

Explicação

Questão 19 de 43

1

Transport of the ovum is facilitated by:

Selecione uma das seguintes:

  • 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

Explicação

Questão 20 de 43

1

Meiosis is completed prior to ovulation.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 21 de 43

1

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

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 22 de 43

1

Alveolar bone is formed from:

Selecione uma das seguintes:

  • mesenchyme derived from somites

  • epithelium from the oral ectoderm

  • mesenchyme from the primitive streak

  • mesenchyme from notochord

  • none of the above

Explicação

Questão 23 de 43

1

The folding of the embryo causes:

Selecione uma das seguintes:

  • 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

Explicação

Questão 24 de 43

1

From which embryonic layer is mesoderm derived?

Selecione uma das seguintes:

  • epiblast

  • hypoblast

  • endoderm

  • neuroectoderm

Explicação

Questão 25 de 43

1

Hatching occurs:

Selecione uma das seguintes:

  • during implantation

  • in the ampulla of the oviduct

  • prior to blastocyst formation

  • during the morula stage

  • none of the above

Explicação

Questão 26 de 43

1

Which of the following statements concerning prenatal development is correct?

Selecione uma das seguintes:

  • 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

Explicação

Questão 27 de 43

1

The oral plate consists of:

Selecione uma das seguintes:

  • 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

Explicação

Questão 28 de 43

1

The first brachial arch gives rise to:

Selecione uma das seguintes:

  • muscles of mastication

  • maxillary teeth

  • mandibular teeth

  • malleus

  • all of the above

Explicação

Questão 29 de 43

1

Somites form from:

Selecione uma das seguintes:

  • ectomesenchyme

  • intermediate mesoderm

  • lateral plate mesoderm

  • paraxial mesoderm

Explicação

Questão 30 de 43

1

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

Selecione uma das seguintes:

  • sclerotome

  • trophoblast

  • mesodermal

  • neural crest

  • endodermal

Explicação

Questão 31 de 43

1

Embryologically the muscular wall of the gut arose from the:

Selecione uma das seguintes:

  • endoderm

  • parietal lateral plate mesoderm

  • visceral lateral plate mesoderm

  • somatic myotome

  • intermediate mesoderm

Explicação

Questão 32 de 43

1

The cells of the _______ will form the embryo proper.

Selecione uma das seguintes:

  • inner cell mass

  • cyrotrophoblast

  • outer cell mass

  • syntiotrophoblast

Explicação

Questão 33 de 43

1

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

Selecione uma das seguintes:

  • cleavage

  • gastrulation

  • primitive streak stage

  • neurulation

  • somite formation

Explicação

Questão 34 de 43

1

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

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 35 de 43

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 36 de 43

1

Which of the following is Incorrect regarding the notochord?

Selecione uma das seguintes:

  • 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

Explicação

Questão 37 de 43

1

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

Selecione uma das seguintes:

  • 1

  • 1, 2, & 3

  • 1 & 3

  • all of the above

  • none of the above

Explicação

Questão 38 de 43

1

Down syndrome is known for:

Selecione uma das seguintes:

  • trisomy of chromosome number 20

  • production of a monosomy situation

  • facial enlargement and lengthened palate

  • fissured tongue and delayed tooth eruption

Explicação

Questão 39 de 43

1

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

Selecione uma das seguintes:

  • notochord

  • prochordal plate

  • secondary yolk sac

  • cardiac plate

Explicação

Questão 40 de 43

1

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

Selecione uma das seguintes:

  • Downs syndrome

  • Fetal alcohol syndrome

  • Asperger syndrome

  • Treacher Collins syndrome

Explicação

Questão 41 de 43

1

The face develops in the human between:

Selecione uma das seguintes:

  • 6 and 10 days

  • 10 and 22 days

  • 12 and 22 days

  • 24 and 38 days

Explicação

Questão 42 de 43

1

Primitive oral cavity is called?

Selecione uma das seguintes:

  • primitive choana

  • buccopharingeal membrane

  • stomatodeum

  • foregut

  • none of these

Explicação

Questão 43 de 43

1

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

Selecione uma das seguintes:

  • growth factors

  • transcription factors

  • receptors

  • messengers

Explicação

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