Test
Embryology Midterm
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Preguntas del test (43)
1Fertilization typically occurs in the:
- Aovary
- Buterus
- Campulla of the oviduct
- Disthmus of the oviduct
- Evagina
2The zona pellucida:
- Ais located between the oocyte and granulosa cells
- Bhardens to provide a block to polyspermy
- Cprevents premature (ectopic) implantation
- Dall of the above
- Enone of the above
3Where 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- A1 & 2
- B1 &3
- C2 & 3
- D2&4
- E1,2,&3
4Within the trunk of the developing embryo, paraxial mesoderm breaks up into:
- Athin layers called the intermediate mesoderm
- Bthick layers called the lateral plate
- Csomitomeres consisting of somitomere components
- Dsomites consisting of sclerotome, dermatome, and myotome components
5During development Meckel's cartilage is known to become a portion of the:
- Achondrocranium
- Bneurocranium
- Cmandible
- Dmaxilla
6The first branchial arch gives rise to:
- Amuscles of mastication
- Bpart of the tongue
- Cnasal septum
- Dmuscles of facial expression
- Ea & b
7At the beginning of the blastocyst stage there is:
- Adevelopment of a fluid filled cavity called the amnion
- Bformation of an inner cell mass which becomes the trophoblast
- Cformation of an outer cell mass which becomes the embryoblast
- Dall of the above
- Enone of the above
8At the earliest stage of development the primitive stomadeum is bounded by the (May/ may not be relevant for this exam):
- Amaxillary and mandibular prominences
- Bthe frontonasal prominence and mandibular prominence
- Cthe frontonasal prominence and cardiac bulge
- Dthe median nasal prominences and mandibular process
- Ethe maxillary and median nasal prominences and mandibular process
9The muscle of the gut wall is embryonically derived from:
- Asclerotome
- Bmyotome
- Cdermatome
- Dintermediate mesoderm
- Elateral plate mesoderm
10The mesodermal layer of the embryo:
- Aarose from ectodermal cells of the epiblast
- Bforms blood vessels and most of the heart
- Cforms cartilage and bone
- Dall of the above
- Enone of the above
11During development the amnion and yolk sac are in temporary communication. This opening is:
- Aallantois canal
- Bneurenteric canal
- CCaso's canal
- Dumbilicus
- Ereichert's membrane
12Neural crest cells can form or become all of the following except:
- Abone
- Bcartilage
- Cmyelin
- Dneurons
- Eolfactory sensory cells
13Secretions of epithelial cells of the oviduct:
- Aprovide nutritional material for the conceptus
- Btogether with cilia establish an outward flow that inhibits bacterial migration toward the peritoneal cavity
- Cproduce a current that helps orient spermatozoa
- Dall of the above
- Enone of the above
14Progression from the 2-cell stage to the morula is called:
- Aimplantation
- Bneurulation
- Ccleavage
- Dgastrulation
- Einsemination
15Which of the following is incorrect regarding the notochord?
- Aarises from a notochordal process which at first is a hollow tubular structure
- Bis formed during gastrulation
- Carises from the primitive pit
- Ddivides the developing embryo into cephalic and caudal halves
- Elies along the long axis of the embryo
16THe muscles of mastication arise from mesenchyme of the _________ branchial arch.
- Afirst
- Bsecond
- Cthird
- Dfourth-sixth
17In the following list of events or stages, which of event would be third: Morula, Fertilization, Graffian follicle, Hatching, Implantation?
- Amorula
- Bfertilization
- Cgraafian follicle
- Dhatching
- Eimplantation
18Which of the following is a false statement?
- Athe zona pellucida is a matrix layer between the follicular epithelium and oocyte
- Ba function of zona pellucida is to prevent premature implantation
- Czona pellucida encircles the morula
- Dzona pellucida is surrounded by granulosa cells
- Ezona pellucida is removed immediately following fertilization
19Transport of the ovum is facilitated by:
- Athe activity of cilia in the uterine tube
- Bperistalic contractions of the muscularis of the uterine tube
- Cthe presence of active flagella in cells of the corona radiata
- Dall of the above
- Ea & b
20Meiosis is completed prior to ovulation.
- AVerdadero
- BFalso
21The syncytiotrophoblast is derived from the outer cell mass while the cytotrophoblast is derived from cells of the inner cell mass.
- AVerdadero
- BFalso
22Alveolar bone is formed from:
- Amesenchyme derived from somites
- Bepithelium from the oral ectoderm
- Cmesenchyme from the primitive streak
- Dmesenchyme from notochord
- Enone of the above
23The folding of the embryo causes:
- Aendoderm to be on the inside of the embryo
- Bectoderm to be on the inside of endoderm
- Cendoderm to be on the outside of the mesoderm
- Dmesoderm to be on the outside of the ectoderm
24From which embryonic layer is mesoderm derived?
- Aepiblast
- Bhypoblast
- Cendoderm
- Dneuroectoderm
25Hatching occurs:
- Aduring implantation
- Bin the ampulla of the oviduct
- Cprior to blastocyst formation
- Dduring the morula stage
- Enone of the above
26Which of the following statements concerning prenatal development is correct?
- Amost congenital malformations occur during the last prenatal week
- Bmaturation of existing structures occurs during the second to eighth week
- Cinitiation of embryonic layers occurs during the first week
- Dthe fetus is the structure present during embryonic period
27The oral plate consists of:
- Aembryonic endoderm, mesoderm, ectoderm
- Ba circular area anterior to the notochord in which the endoderm is fused to the embryonic mesoderm
- Cthe cloacal membrane and the overlying amnion
- Dendoderm of the roof of the yolk sac and embryonic ectoderm
- Ethe cardiogenic mesoderm and the neuroectoderm
28The first brachial arch gives rise to:
- Amuscles of mastication
- Bmaxillary teeth
- Cmandibular teeth
- Dmalleus
- Eall of the above
29Somites form from:
- Aectomesenchyme
- Bintermediate mesoderm
- Clateral plate mesoderm
- Dparaxial mesoderm
30Which of the following cells have migrated from the neuroectoderm and are the basis for future bone of the maxilla and mandible?
- Asclerotome
- Btrophoblast
- Cmesodermal
- Dneural crest
- Eendodermal
31Embryologically the muscular wall of the gut arose from the:
- Aendoderm
- Bparietal lateral plate mesoderm
- Cvisceral lateral plate mesoderm
- Dsomatic myotome
- Eintermediate mesoderm
32The cells of the _______ will form the embryo proper.
- Ainner cell mass
- Bcyrotrophoblast
- Couter cell mass
- Dsyntiotrophoblast
33At the beginning of the third week of development a thickening of ectoderm overlying the notochord indicates the start of:
- Acleavage
- Bgastrulation
- Cprimitive streak stage
- Dneurulation
- Esomite formation
34Prior to the formation of the primitive streak the amnion and blastocystic cavity (yolk sac) communicate via the neuroenteric canal.
- AVerdadero
- BFalso
35Regarding the early embryo, which of the following is False?
- Athe epiblast faces the amniotic cavity
- Bthe embryonic shield consists of 2 layers prior to the formation of the primitive streak
- Cfollowing gastrulation mesoderm fills all the space between the ectoderm and endoderm
- Dthe hypoblast cells are primitive endoderm
36Which of the following is Incorrect regarding the notochord?
- Ait arises from a notochordal process which at first is a hollow tubular structure
- Bit is formed during gastrulation
- Carises from the primitive node
- Dit extends from the primitive pit in a caudal direction
- Edivides the developing embryo into right and left halves
37Conceptus includes:
1. extraembryonic structures derived from the zygote
2. embryonic structures derived from the zygote
3. chorion
4. syncytiotrophoblast- A1
- B1, 2, & 3
- C1 & 3
- Dall of the above
- Enone of the above
38Down syndrome is known for:
- Atrisomy of chromosome number 20
- Bproduction of a monosomy situation
- Cfacial enlargement and lengthened palate
- Dfissured tongue and delayed tooth eruption
39Which of the following supports the primitive embryo and is directly derived from ectoderm alone?
- Anotochord
- Bprochordal plate
- Csecondary yolk sac
- Dcardiac plate
40Which of the following syndromes occurs due to failure of neural crest cells to migrate?
- ADowns syndrome
- BFetal alcohol syndrome
- CAsperger syndrome
- DTreacher Collins syndrome
41The face develops in the human between:
- A6 and 10 days
- B10 and 22 days
- C12 and 22 days
- D24 and 38 days
42Primitive oral cavity is called?
- Aprimitive choana
- Bbuccopharingeal membrane
- Cstomatodeum
- Dforegut
- Enone of these
43Proteins that bind to specific DNA sequences and regulate transfer of genetic information from DNA to mRNA are called:
- Agrowth factors
- Btranscription factors
- Creceptors
- Dmessengers
Información
- Descripción
- 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.
- Autor
- katelynmaria02
- Idioma
- English
- Visitas
- 429
- Historial
- Creado el 11 sep 2014 · actualizado el 7 mar 2018
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