embryonic and fetal periods

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MarineLopes
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293177
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embryonic and fetal periods
Updated:
2015-01-17 10:58:52
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cenas que acontecem nesta altura do mes
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  1. All of the essential features
    of the external body form are completed by the end of the _____ week.

    Thirth

    Fourth

    Fifth

    Sixth

    Eight
    eight
  2. "Quickening" or the
    period when fetal movements are commonly first felt by mother occurs:

    Near the end of the first trimester.

    Around the middle of the second trimester.

    At the end of the second trimester.

    At the end of the embryonic period.

    At the end of the fetal period.
    • middle of the second semester.
    • 5th month of pregancy
    • but they start at the end of the 1st trimester
  3. Mesoderm lateral to the notochord :

    is derived from the hypoblast

    differentiates into ganglia

    migrates cranial to prochordal plate

    induces endoderm differentation

    arises from invagination of the epiblast at the primitive streak 

    arises during the 3rd week
    • Migrates cranial to the prochordal plate
    • arises from the invagination of the epiblast at the primitive streak
    • arises during the 3rd week
  4. The following organs are
    derived from mesoderm except:

    Skeletal musculature.

    Musculature of blood vessels.

    Cardiac musculature.

    Suprarenal cortex.

    Suprarenal medulla.
    suprarenal medulla
  5. suprareanl medulla or adrenal medulla arises from what?
    neural crest cells and they are ectodermal
  6. Paraxial (somatic) mesoderm gives rise to:

    Muscles in the stomach.

    Vertebrae.

    Muscles of mastication.

    Musculature of the trunk and extremities.
    • vertebrae
    • musculature of trunk and extremeties

    • muscles of mastication arise from the 1st pharyngeal arch
    • muscles of stomach arise from the lateral plate mesoderm
  7. The endodermal germ layer gives rise to the epithelium and wall of the gastrointestinal tract.

    True.

    False.
    • false 
    • epithelium of the wal of gastrointestinal tract comes from endoderm BUT the wall of the tract arises from the visceral layer of the lateral plate mesoderm
  8. During the fourth week of
    development, the growth of head, tail and lateral folds transforms the flat germ disc into a tubular embryo.

    True.

    False.
    true
  9. Somites:

    Differentiate into myotomes which give rise to skeletal muscle in trunk and limbs

    Differentiate into sclerotomes which give rise to vertebrae

    Arise from segmentation of the paraxial mesoderm

    Differentiate into myotomes which give rise to skeletal muscles of the limbs.

    Differentiate into dermatomes which give rise to dermal skin components
    • Differentiate into myotomes which give rise to skeletal mucle in trunk and limbs
    • Differentiate into scleretomes which give rise to vertebrae
    • Arise from segmentation of the paraxial mesoderm
    • Differentiate into myotomes which give rise to skeletal muscles of the limbs
    • Differentiates into dermatomes which give rise to dermal components of the skin
  10. Following are four structures
    together with a germ layer. Identify the INCORRECT association.

    Epithelium of the pancreas –endoderm.

    Hair – ectoderm.

    Bone – mesoderm.

    Epithelium of the lung –mesoderm.
    • epithelium of the lung -mesoderm 
    • the epithelium of the lung and pancreas is endodermal indicating origin from the primitive gut
  11. Of the following, which is derived from endoderm?

    Muscle.

    Kidneys.

    Gonads.

    Tonsils

    Hair.
    • tonsils
    • tonsils arise from endodermal epithelium lining the 2nd pharyngeal arch
    • kidneys and gonads arise from the intermediate mesoderm
    • hair is ectodermal
    • skeletal mucle comes from somites and somitomeres
    • cardiac and most smooth muscle comes from splanchnic mesoderm.
    • some smooth mucle comes from neural crest
  12. Which of the following structures is NOT derived from mesenchyme?

    Muscle fiber.

    Cartilage of the limbs.

    White blood cell precursor.

    Epidermis.

    Blood vessel
    epidermis
  13. what's the origin of dermis?
    mesenchyme
  14. Of the following, which is derived from endoderm?

    Hypophysis.

    Epithelium of the pharynx.

    Epithelium of anal canal.

    Enamel of teeth.

    Muscle
    epithelium of pharynx
  15. Epithelium of the anal canal is derived from what?
    • lower part - ectoderm
    • upper part- endoderm
  16. how do we call the border between the ectodermal and endodermal lining in the anal canal?
    Pectinate line
  17. During the period of development of the major organ systems, development of the major organ systems,
    development and differentiation appears first in what region?

    Head.

    Tail.

    Mid-embryo.

    Distal third.

    Mid-third
    head
  18. At the beginning of the fourth week, day 22, there are about 7-10 somites present. About how many are there at
    the end of the fourth week, day 28?

    7-10.

    10-13.

    20-23.

    26-29.

    42-44
    26 to 29
  19. Almost all internal organs are well laid down at ______ months:

    1.

    2.

    3.

    4.

    5.
    2 months
  20. The space between the split
    layers of mesoderm is the:

    Amniotic cavity.

    Blastocele.

    Foregut.

    Hindgut

    Intraembryonic coelom
    intraembryonic coelon
  21. Which of the following are NOT distinctive characteristics of the fourth week of development?

    Neuropores.

    Somites.

    Branchial arches.

    Lower limb buds.

    Hand plates

    Foot plates
    • Hand plates
    • Foot plates
    • 6th weeks
  22. Which of the following are distinctive characteristics of the fourth week of development?

    Neuropores.

    Somites.

    Branchial arches.

    Lower limb buds.

    Hand plates.
    • neuropores
    • somites
    • branchial arches
    • lower limbs buds
  23. During human embryonic development:

    The inner cell mass develops into fetal portion of the placenta.

    The yolk sac stores nutrients for the first four weeks of development.

    The allantois stores waste products.

    The location of cells in the morula dictates their fate.
    the location of thecells in the morula dictates their fate
  24. During the human embryonic development, the inner cell mass develops into what?
    embryo proper
  25. During the human embryonic development, what's the nutritive function of the yolk sac?
    none
  26. During the human embryonic development, the allantoins serves for what?
    • in humans nothing
    • in animals stores waste products
  27. Which of the following structures does not turn under onto the ventral surface of the embryo during folding of the head?

    Prechordal plate.

    Heart.

    Notochord.

    Pericardial cavity.

    Septum transversum
    Notochord - it remains dorsal
  28. Which of the following structures turn under onto the ventral surface of the embryo during folding of the head?

    Prechordal plate.

    Heart.

    Notochord.

    Pericardial cavity.

    Septum transversum.

    buccopharyngeal membrane
    • prechordal plate
    • heart
    • pericardial cavity
    • septum transversum
    • buccopharyngeal membrane
  29. At birth, the crown-rump length
    of the newborn averages __ cm

    19.

    28.

    35.

    44.

    52.
    35
  30. the crown-rump lenght of the fetus measures what?
    • fetus sitting heigh.
    • most of the fetus growth in lenght occurs early in the fetal period .
    • most of the fetal growth in weight occurs late in the fetal period
  31. The embryo is called a fetus after
    the:

    Third week.

    Second month.

    Third month.

    Fourth month.

    Fifth month.
    second month
  32. Lanugo covers the body, some head hair show, and fetal movements are felt by the mother when the fetus is about how many moths old?

    5.

    6.

    7.

    8.

    9
    5th month
  33. what's the vernix caesosa?
    • greasy, whittish film covering the skin of the fetus 
    • protects the fetal skin from maceration by the amniotic fluid.
  34. Which of the following statements about fetal age and weight shows a normal relationship?

    8 weeks - 10g

    12 weeks - 300g

    20 weeks - 800g

    26 weeks - 1000g

    38 weeks - 4600g
    • 26 weeks -1000g 
    • full term fetus -300-3400 g
  35. Which of the following structures is derived from paraxial mesoderm of the cervical region?

    Enamel of the teeth.

    Smooth muscle of the gut.

    Mucous linning of the larynx.

    Sympathetic chain ganglia.

    Ureter.

    Suprarenal medulla.

    Patella.

    Skeletal muscle of the upper limb.

    Parietal peritoneum.

    Linning of the lungs.

    Spinal cord.

    Parenchyma of the pancreas.

    Eleventh thoracic vertebra.

    Aortic arch.
    • skeletal muscle of the upper limb
    • the paraxial mesoderm forms somites which give rise to axial skeleton and CT of trunk, all skeletal muscle and dermis.

    in the lower cervical regions , the somitic myotomes form the skeletal muscle of the developing upper limb
  36. Which of the following is derived from the splanchnic layer of the layer of the lateral plate mesoderm?

    Enamel of the teeth.

    Smooth muscle of the gut.

    Mucous linning of the larynx.

    Sympathetic chain ganglia.

    Ureter.

    Suprarenal medulla.

    Patella.

     Skeletal muscle of the upper limb.

    Parietal peritoneum.

    Linning of the lungs.

    Spinal cord.

    Parenchyma of the pancreas.

    Eleventh thoracic vertebra.

    Aortic arch.
    smooth muscle of the gut
  37. Which of the following is derived from the intermediate mesoderm?

    Enamel of the teeth.

    Smooth muscle of the gut.

    Mucous linning of the larynx.

    Sympathetic chain ganglia.

    Ureter.

    Suprarenal medulla.

    Patella.

     Skeletal muscle of the upper limb.

    Parietal peritoneum.

    Linning of the lungs.

    Spinal cord.

    Parenchyma of the pancreas.

    Eleventh thoracic vertebra.

    Aortic arch.

    Kidneys
    • ureter
    • kidneys

    • paraxial mesoderm - somites abd their derivatives
    • somatic layer of lat plate mesoderm - CT of body wall and limbs
    • splanchnic layer of lat plate mesoderm - CT  of gut wall

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