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Exercise 12: The Fetal Skeleton

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created 2 years ago by jncanf
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pg. 167 - pg. 168

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  • 1
    Are the same skull bones seen in the adult also found in the fetal skull?
    No, some areas still remain to be converted to bone.
  • 2
    How does the size of the fetal face compare to its cranium?
    Face is smaller
  • 3
    How does this compare to the adult skull?
    Adult skull is 1/8th total body length whereas the fetal skull is 1/4th total body length
  • 4
    What are the outward conical projections on some of the fetal cranial bones?
    These are ossification centers
  • 5
    What is a fontanel?
    Fibrous membranes between the bones of a fetal skull
  • 6
    What is its fate? (fontanel)
    becomes bone by 22 months
  • 7
    What is the function of the fontanels in the fetal skull?
    Allows skull to be compressed during birth and allows for brain growth during late fetal life.
  • 8
    Describe how the fetal skeleton compares with the adult skeleton in the following areas:

    vertebrae
    Fetus=33 Adult=24

    The 5 sacral and 4 coccyx bones of the fetus fuse together - that's why adults only have 24
  • 9
    Describe how the fetal skeleton compares with the adult skeleton in the following areas:

    coxal bones
    In the adult skeleton the coxal bones have fused (ischium, pubic, and ilium), while in the fetal skeleton these bones have not fused.
  • 10
    Describe how the fetal skeleton compares with the adult skeleton in the following areas:

    carpals and tarsals
    The carpals and tarsals are not ossified in the fetus.
  • 11
    Describe how the fetal skeleton compares with the adult skeleton in the following areas:

    sternum
    Its component parts are not fused in the fetus.
  • 12
    Describe how the fetal skeleton compares with the adult skeleton in the following areas:

    frontal bone
    The frontal bone is split at the midsaggital line at the metopic suture. In adults, the suture closes, creating a solid bone.
  • 13
    Describe how the fetal skeleton compares with the adult skeleton in the following areas:

    patella
    May be absent in the fetus; if present it is unossified.

    Quite a bit softer and smaller in the fetus. The kneecap develops throughout childhood and into mid-teens.
  • 14
    Describe how the fetal skeleton compares with the adult skeleton in the following areas:

    thoracic cage
    In a fetus the rib cage is compressed laterally froming a pointed anterior rib cage surface.
    The thorax becomes more rigid with age, costal cartilages ossify
  • 15
    How does the size of the fetus's head compare to the size of its body?
    it is much larger leaving the body look too small; than if you compare an adult head to its body it seems to have better proportion.
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    Fetal Skeleton (Image)
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