IEA Embryology Mock Midterm Placenta by benbenzhou


IEA Embryology Mock Midterm Placenta

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									                           IEA Embryology Mock Midterm
                                  March 5, 2003

This exam was prepared by students involved with IEA honor society. It should be used
only as a tool to aid you in your studying for the embryology midterm. It should NOT be
 used as your only study aid. If you have and questions or concerns regarding this mock
              midterm, please contact Jeremy Rutherford at
                                        Good Luck!

   1. When is the earliest time that chorionic villi biopsy can be performed?
        a. 7th month
        b. 7th week
        c. 8th month
        d. 8th week

Match the following conditions with the appropriate disease. As always, answers may be
used multiple times or not at all.
       a) Formed from the union of anterior and posterior cardinal veins
       b) enlarges and descends toward septum intermedium
       c) opens on the wall of atrium
       d) Most common ASD
       e) dorsal opening of septum primum
       f) none of the above

   2.   Sinus venosus____
   3.   Ostium primum____
   4.   Duct of Cuvier____
   5.   Probe patent foramen ovale____
   6.   Septum primum____

   7. The midgut of the fetus goes through many rotations starting the 3 rd week of life.
      Which of the following diseases results due to the persistence of the
      vitellointestinal duct?
          a. Annualar pancreas
          b. Hirshprung disease
          c. Meckel’s diverticulum
          d. Congenital omphaloceole
   8. What germ layer does the heart develop from?
          a. Somatopleuric mesoderm
          b. Splanchnopleuric endoderm
          c. Lateral plate mesoderm
          d. Ectoderm
   9. _________ induces the formation of the _______________
          a. Primitive node and notochord
          b. Primitive streak and neural tube
          c. Henson’s node node and prochordal plate
        d. Neural tube and Henson’s node
10. The trophoblasts secrete which of the following?
        a. ACTH
        b. Trophoblastic juice
        c. GH
        d. LH
        e. HCG
11. What stage in the menstral cycle do the spiral arteries become more coiled and
        a. Flow Phase
        b. Progesteronic Phase
        c. Menstral Phase
        d. Premestral Phase
        e. Estrogenic Phase
12. Which of the following is associated with Down’s Syndrome?
        a. Trisomy 22
        b. High levels of HCG
        c. Low levels of HCG
        d. High levels of AFP
        e. Low levels of AFP

13. How many paris of somites are there on the 23 day if development?
      a. 9
      b. 16
      c. 12
      d. 26
      e. 32
14. What phase of the menstrual cycle is dominated by high levels of estrogen?
      a. Menstrual phase
      b. Proliferatve phase
      c. Secretory phase
      d. Premenstrual phase
      e. Flow phase

15. On what day after fertilization does the zona pellucida disintegrate?
       a. 2
       b. 3
       c. 4
       d. 5
       e. 6

16. Which of the following are sites where blood vessels first appear?
      a. Allantois
      b. Chorion
      c. Amniotic cavity
      d. A and B only
       e. A, B and C

17. Which of the following correctly describes secondary chorionic villi?
      a. A central core of cellular trophoblasts surrounded by mesenchyme
      b. A central core of syncytiotrophoblasts covered on the periphery by cellular
      c. A central core of mesenchyme covered on the periphery by the cellular
          and syncytiotrophoblasts
      d. A central core of cellular trophoblasts and a peripheral layer of
      e. A central core of mesenchyme with blood vessels covered on the
          periphery by cellular and syncytiotrophoblasts

18. A young woman who is currently into the 14 th week of her first pregnancy comes
    to you and says she thinks her baby is starting to move around. Being the
    intelligent St. George’s graduate you are, you tell her:
        a. This is a totally natural occurrence at this stage of her pregnancy
        b. This is actually occurring a little later than normal and you order some
            tests on the fetus
        c. This being her first pregnancy, her feeling movements this early is
        d. This is not normal to feel movements this early and you investigate a
            possible cause of these movements
        e. You didn’t do well in Embryology in medical school and refer her to
            someone who knows the answer

19. Which of the following is not a component of the placental barrier?
      a. Allantois
      b. Endothelial lining of the villous vessels
      c. Connective tissue of the villi
      d. Cytotrophoblasts
      e. Syncytiotrophoblasts

20. Which of the following forms the urachus?
      a. Yolk sac
      b. Connecting stalk
      c. Allantois
      d. Chorion
      e. Amnion

21. In the development of the lung, which stage occurs first?
        a. Alveolar stage
        b. Terminal sac stage
        c. Canalicular stage
        d. Psuedo-glandular stage
22. The Tetralogy of Fallot consists of all the following except:
       a. Pulmonary stenosis
       b. Mitral valve defect
       c. Hypertrophy of right ventricle
       d. Over riding of aorta
       e. Ventricular septal defect

23. The cloacal sphincter differentiates into all the following muscles except:
       a. Sphincter ani externus
       b. Bulbospongiosus
       c. Ischiocavernosus
       d. Levator ani
       e. Superficial transverse perineal muscle

24. Which of the following results from the absence of parasympathetic ganglia in a
    segment of the descending or sigmoid colon?
       a. Meckel’s diverticulum
       b. Subhepatic cecum
       c. Congenital omphalocoele
       d. Hirschsprung disease
       e. Hiatial hernia

25. Which of the following is not a collecting part of the adult kidney?
      a. Ureter
      b. Bowman’s capsule
      c. Major calyces
      d. Minor calyces
      e. Arched tubules

26. Which of the following results from the complete non-obliteration of the
        a. Urachal sinus
        b. Urachal fistula
        c. Urachal cyst
        d. Umbilical fistula
        e. Umbilical cyst
27. The normal site of fertilization is
        a. Vagina
        b. Cervix
        c. Ampulla of fallopian tube
        d. Ovary
28. Nucleus Pulposus is a persisting remnant of the
        a. Primitive streak
        b. Notochord
        c. Allantois
        d. Prochordal plate
29. Neural crest cells give rise to all the following EXCEPT
        a. Schwann cells
        b. Pigment cells
        c. Pia and arachnoid
        d. Retina
30. The muscles of the larynx develop from the mesoderm of:
        a. 3rd arch
        b. 4th and 6th arches
        c. 4th and 5th arches
        d. none of the above
31. Placenta
        a. Is delivered during the 2 nd stage of labor
        b. Its maternal surface is smooth
        c. Its fetal component develops from the chorion laeve
        d. Its normal site of attachment is the posterior wall of the uterus
32. The cartilage and musculature of the trachea develop from:
        a. 4th arch mesoderm
        b. 6th arch mesoderm
        c. both a and b
        d. splanchnopleuric mesoderm
33. Capacitation of the spermatozoa occurs in the:
        a. Seminiferous tubules
        b. Epididymis
        c. Female genital tract
        d. Seminal vesicle
34. The blastocyst becomes completely embedded in the uterine stroma by the:
        a. 2nd day
        b. 6th day
        c. 12th day
        d. 18th day
35. The inner cell mass gives rise to all the following EXCEPT:
        a. Amnion
        b. Yolk sac
        c. Hypoblasts
        d. Embryotroph
36. The neural tube is induced to form from ectoderm by:
        a. Neural crest cells
        b. The notochord
        c. Secondary mesoderm
        d. Primitive streak
37. Parietal pleura is formed from:
        a. Endoderm
        b. Splanchnic mesoderm
        c. Ectoderm
        d. Somatic mesoderm
38. The deciduas basalis:
        a. Overlies the conceptus
        b. Forms the basal portion of the embryo
        c. Forms the maternal portion of the placenta
        d. Is the largest part of the deciduas
39. The developing larynx undergoes recanalization by the:
        a. 8th week
        b. 6th week
        c. 10th week
        d. 12th week
40. A fetus is born prematurely at 28 weeks, the mother would like to know if the
    fetus is a capable of surviving. You tell the mother:
        a. yes, the fetus will survive because although the lung is not mature,
             respiration is possible
        b. yes, the fetus will survive because it has adequate terminal sacs and
             surfactant to permit survival
        c. no, the fetus will not survive because there are no respiratory structures

41. Lung Hypoplasia is associated with :
       a. agenesis of lung
       b. oligohydramnios
       c. renal agenesis
       d. a and c
       e. b and c

42. The tubular heart is suspended into the pericardial cavity from the ventral side of
    the foregut by the:
        a. epimyocardial mantle
        b. splanchnic mesoderm
        c. pericardium
        d. dorsal mesocardium

43. The tubular heart in order from caudal to cranial is as follows:
       a. sinus venosus, atrium, atrioventricular canal, ventricle, bulbous cordis,
           truncus arteriosus
       b. ventricle, atrium, bulbous cordis, truncus arteriosus, sinus venosus,
           atrioventricular canal
       c. atrium, sinus venosus, atrioventricular canal, ventricle, bulbous cordis,
           truncus arteriosus
       d. truncus arteriosus, atrioventricular canal, atrium, sinus venosus, bulbous
   44. The septum spurium is formed by _______; the septum intermedium is formed by
          a. dorsal and ventral endocardial cushions; right and left venous valves
          b. right and left venous valves; dorsal and ventral endocardial cushions
          c. right and left endocardial cushions; dorsal and ventral venous valves
          d. none of the above

    45. Pulmonary stenosis, ventricular septal defect and hypertrophy of right ventricle
        are associated with:
            a. persistent truncus
            b. Tetrology of Fallot
            c. Tertiology of Fallot
            d. Di George’s Syndrom
Questions 46-49, match the embryological structure to its adult remnant. Each choice
can be used once or not at all.
        a) Sinus venarum
        b) Anterior part of right atrium
        c) Pulmonary vein
        d) Anterior part of left atrium
        e) Posterior part of left atrium
    46. Right horn of sinus venosus____
    47. Proximal portions of primitive pulmonary veins____
    48. Left half of primitive atrium____
    49. Right half of primitive atrium____
    50. The dorsal mensentery of the gut is derived from ___________; the ventral
        mesentery is dervived from.
            a. Ectoderm; endoderm of the yolk sac
            b. Endoderm of the yolk sac; splanchnic mesoderm
            c. Septum transversum; endoderm of the yolk sac
            d. Splanchnic mesoderm; septum transversum
    51. Congenital omphalocoele results from the:
            a. Non-rotation of the midgut
            b. Reverse rotation of the hindgut
            c. Failure of the reduction of the physiological hernia of the midgut loop
            d. Failure of fixation
    52. Ectopic implantions most commonly occur in the
            a. Ovary
            b. Abdomen
            c. Uterine tube
            d. Cervix
            e. Peritoneal cavity
53. The normal chromosome number of a human sermatid is
        a. 23 autosomes plus 2 different sex chromosomes
        b. 22 autosomes plus and X and Y chromosome
        c. 23 autosomes plus 2 identical sex chromosomes
        d. 22 autosomes plus and X or a Y chromosome
54. The head and tail folds are due to what?
        a. Primitve streak
        b. Elongation of the neural tube
        c. Elongation of the notochord
        d. Growth of somites in a caudal and cephalic direction
55. Multigravida is:
        a. Extrusion of the yolk sac through the primitive umbilical opening
        b. First birth
        c. Second birth
        d. Premature rupture of the colacal membrane
56. The most frequently used method for measuring the length of 6-week old embryos
        a. Greatest length
        b. Standing height
        c. Crown-Rump (CR) length
        d. Crown-heel (CH) length
        e. Total length
57. The endothelial linings of the blood vessels are fromed from
        a. Angioblastic cells
        b. Haemangioblastic cells
        c. Hypoblastic cells
        d. Trophoblastic cells
58. All of the following about the valves of the primitive heart are incorrect except
        a. The right venous valve merges with interatrial septum
        b. The lower part of the right venous valve forms the valve of the superior
            vena cava and the valve of the coronary sinus
        c. The upper part of the right venous valve forms the crista terminalis
        d. The left venous valve forms the valve of the coronary sinus
59. The cloacal membrane is made up of
        a. Endoderm
        b. Endoderm and mesoderm
        c. Endoderm and ectoderm
        d. Ectoderm and mesoderm
        e. Ectoderm
60. The anterior neuropore closes on day_______. If this does not occur the
    teratologic condition that arises is known as_____________
        a. 25, persistent neurenteric canal
        b. 27, meroanencephaly
        c. 25, anencephaly
        d. 27, persistent neurenteric canal
61. Intraembryonic celomic clefts appear in the:
         a. Lateral plate mesoderm
         b. Paraxial mesoderm
         c. Intermediate mesoderm
         d. Somites
         e. Primary mesoderm
62. The thoracic diaphragm, which separates the pleural and peritoneal cavities is
    formed by the fusion of:
         a. Septum transversum
         b. Pleuroperitoneal membranes
         c. Primitive dorsal mesentery
         d. Body wall mesenchyme
         e. All of the above
63. The secreting part of the kidney is formed from the:
         a. Pronephros
         b. Mesonephros
         c. Metanephric cap
         d. Ureteric bud
         e. Wolffian duct
64. Each horn of the sinus venosus receives this vein from the yolk sac
         a. Vitelline vein
         b. Umbilical vein
         c. Anterior cardinal vein
         d. Common cardinal vein
65. A 24 year-old female states that she has a very regular menstrual cycle that is 27
    days in length. The projected time of ovulation for this woman would be about
         a. 14th day following the beginning of her last menstrual period.
         b. 13th day following the beginning of her last menstrual period.
         c. 12th day following the beginning of her last menstrual period.
         d. 12th day following the end of her last menstrual period.
         e. 13th day following the end of her last menstrual period.
1. D    47. E
2. F    48. D
3. F    49. B
4. A    50. D
5. D    51. C
6. B    52. C
7. C    53. D
8. A    54. B
9. A    55. C
10. E   56. C
11. B   57. A
12. E   58. C
13. C   59. C
14. B   60. C
15. D   61. A
16. D   62. E
17. C   63. C
18. D   64. A
19. A   65. B
20. C
21. D
22. B
23. D
24. D
25. B
26. B
27. C
28. B
29. D
30. B
31. D
32. D
33. C
34. D
35. D
36. B
37. D
38. C
39. C
40. B
41. E
42. D
43. A
44. B
45. B
46. A

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