Podcast
Questions and Answers
During which period does the transformation of embryo to fetus occur?
During which period does the transformation of embryo to fetus occur?
At the beginning of which month is the head approximately half of the crown-rump length (CRL)?
At the beginning of which month is the head approximately half of the crown-rump length (CRL)?
When does the size of the head become approximately one-fourth of crown-heel length (CHL)?
When does the size of the head become approximately one-fourth of crown-heel length (CHL)?
At what point do external genitalia show differences during the fetal period?
At what point do external genitalia show differences during the fetal period?
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When do the legs become short and the thighs small during the third month?
When do the legs become short and the thighs small during the third month?
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When does the primary ossification center appear?
When does the primary ossification center appear?
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During which week does the spleen become an important site of hematopoiesis?
During which week does the spleen become an important site of hematopoiesis?
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At what stage does the fetus lengthen rapidly and gain fine hair known as lanugo?
At what stage does the fetus lengthen rapidly and gain fine hair known as lanugo?
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When do the intestines withdraw into the abdominal cavity, ceasing the umbilical cord swelling?
When do the intestines withdraw into the abdominal cavity, ceasing the umbilical cord swelling?
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At which point does the respiratory and central nervous system not differentiate sufficiently, although type II pneumocytes secrete surfactant?
At which point does the respiratory and central nervous system not differentiate sufficiently, although type II pneumocytes secrete surfactant?
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When does the skin become covered and protected by vernix caseosa?
When does the skin become covered and protected by vernix caseosa?
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At what stage does the fetus gain substantial weight and its skin becomes wrinkles and translucent, pink to red?
At what stage does the fetus gain substantial weight and its skin becomes wrinkles and translucent, pink to red?
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When do the testes begin to descend in male fetuses?
When do the testes begin to descend in male fetuses?
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At what point is the fetus able to breathe air by functioning lungs and have fully formed CNS control over rhythmic breathing and body temperature?
At what point is the fetus able to breathe air by functioning lungs and have fully formed CNS control over rhythmic breathing and body temperature?
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During which week does the spleen shift from being an important site of hematopoiesis to bone marrow taking over this function?
During which week does the spleen shift from being an important site of hematopoiesis to bone marrow taking over this function?
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At what stage does the fetus exhibit substantial weight gain, wrinkled skin with visible toenails, and responds to noise with blink-startle responses?
At what stage does the fetus exhibit substantial weight gain, wrinkled skin with visible toenails, and responds to noise with blink-startle responses?
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Study Notes
Embryo to Fetus Transformation
- The transformation of embryo to fetus occurs at the end of the eighth week.
Fetal Development Milestones
- At the beginning of the third month, the head is approximately half of the crown-rump length (CRL).
- The size of the head becomes approximately one-fourth of crown-heel length (CHL) by the end of the third month.
- External genitalia show differences during the fetal period by the end of the third month.
- The legs become short and the thighs small during the third month.
- The primary ossification center appears by the end of the eighth week.
- The spleen becomes an important site of hematopoiesis during the ninth week.
- The fetus lengthens rapidly and gains fine hair known as lanugo by the fourth month.
- The intestines withdraw into the abdominal cavity, ceasing the umbilical cord swelling, by the tenth week.
- The respiratory and central nervous system do not differentiate sufficiently, although type II pneumocytes secrete surfactant, by the end of the eleventh week.
- The skin becomes covered and protected by vernix caseosa by the end of the twelfth week.
- The fetus gains substantial weight and its skin becomes wrinkled and translucent, pink to red, by the fourteenth week.
- The testes begin to descend in male fetuses by the fourteenth week.
- The fetus is able to breathe air by functioning lungs and have fully formed CNS control over rhythmic breathing and body temperature by the twenty-fourth week.
- The spleen shifts from being an important site of hematopoiesis to bone marrow taking over this function by the twenty-eighth week.
- The fetus exhibits substantial weight gain, wrinkled skin with visible toenails, and responds to noise with blink-startle responses by the twenty-eighth week.
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Description
Test your knowledge on the development of the fetal period, which spans from the 9th week of pregnancy until birth. Learn about the maturing of tissues and organs, rapid body growth, and the transformation from embryo to fetus.
