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26 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Three pairs of pharyngeal arches are visible by =
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day 26.
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pharyngeal arches
major part of the first arch gives rise to the = |
mandible (lower jaw)
maxilla (upper jaw). |
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visible by the end of the fourth week.
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Upper limb buds and Lower limb buds
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At the beginning of this week , the digits of the hand are separated but noticeably webbed.
WEEK ? |
8th Wk
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***At the end of the eighth week, the embryo has distinct human characteristics, however,
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END of 8th Week
the head is still disproportionately large, constituting almost half of the embryo. |
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Prego term is how many weeks?
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40 wks +/-
post term = Pre term = |
+42
--38 |
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info
Although sex differences exist in the appearance of the external genitalia, they are not distinctive enough to permit accurate sexual identification. |
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The fetal period:
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9th week to birth
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Info
Development during the fetal period is primarily concerned with rapid body growth and differentiation of tissues, organs, and systems. |
Info
The transformation of an embryo to a fetus is gradual, but the name change is meaningful because it signifies that the embryo has developed into a recognizable human being. |
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By the end of _______wk
the CRL has more than doubled. |
12
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Although growth of the head slows down considerably by the twelfth week, it is still disproportionately large compared with the rest of the body.
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By the end of __ ? weeks, primary
ossification centers appear in the skeleton, especially in the cranium (skull) and long bones. |
12
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At ____ weeks, the liver is the major site of erythropoiesis
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9 wks
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By the end of the _______ ? week, this activity has decreased in the liver and has begun in the spleen.
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12th
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Before 9th week-----
After 9th week--------- 12th to 28th ------------- After 28th ------------------- |
Yolk sac
Liver spleen (also thymus) BM |
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What wks do these develope ?
Yolk sac Liver (thymus) spleen BM |
Before 9th week----- Yolk sac
After 9th week--------- Liver 12th to 28th ------------- spleen After 28th ------------------- BM |
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Urine formation begins between the __________
weeks and urine is discharged into the amniotic fluid. |
9 & 12 weeks
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T/F
Fetal waste products are transferred to the maternal circulation by passing across the placental membrane. |
T
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***
At nine weeks, the liver is the major site of |
erythropoiesis
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By the end of the ______ this activity has decreased in the liver and has begun in the ? |
12th week
spleen |
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By ___? weeks the ovaries are differentiated and contain primordial ovarian follicles that contain oogonia.
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16 wks
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The sex of the external genitalia can be recognized by ___ to ___ weeks in most cases.
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12 to 14 wks
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Fetal movements - also called ____? are commonly felt by the mother at ____ to ____ wks.
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17 – 20
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17th Wk
The skin is now covered with a greasy, cheese like material - |
vernix caseosa.
The vernix caseosa protects the delicate-fetal skin |
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The bodies of 20-week fetuses are usually completely covered with fine downy hair -
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Lanugo
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Brown fat forms during this period and is the site of =
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heat production
Why is it brown fat = |
Has lots of mitochondria and produces heat due to the Mitochondria
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Brown fat is chiefly found at the
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the root of the neck,
posterior to the sternum, perirenal area |
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