Review the images and text about stages 13 (about 32 days) and 23 (about 53-58 days), and compare the limb development at these stages.
At stage 13, all four limb buds are present, with the upper limb buds resembling flippers. By stage 23, the upper limbs have well-formed arms, elbows, wrists, and fingers, and the lower limbs have well-formed knees, feet, and toes.
Which of the following did you include in your response?
The pregnancy is considered “at term” at this point.
At this point, eyelids and ears are forming.
At this point, lungs begin to produce surfactant.
Fetus begins movements called quickening. At this point, the chance of a miscarriage decreases. The pregnancy is considered “at term” at this point. At this point, eyelids and ears are forming. At this point, lungs begin to produce surfactant.
How does an ultrasound produce an image of a fetus in the mother’s uterus?
An ultrasound probe sends high-frequency sound waves into the uterus. The waves bounce back differently from the fetus and surrounding tissues, and a computer uses the returning echoes to create an image.
At this point, the chance of a miscarriage decreases.
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