ANATOMY | 4th Q Flashcards
Ovulation occurs
1st week
Fertilization occurs. Cell division begins and continues. Chorion appears
1st week
Symptoms of early pregnancy (nausea, breast swelling and ternderness, fatigue) are present. Blood pregnancy test is positive
2nd week
First menstruation is missed. Urine pregnancy test is positive. Symptoms of early pergnancies continue
3rd week
Implantation occurs. Amnion and yolk sac appear. Embryo has tissues. Placenta begins to form
2nd week
The nervous system begins to develop. Allantois and blood vessels are present. Placenta is well formed
3rd week
Limb buds form. Heart is noticeable and beating. The nervous system is prominent. An embryo has a tail. Other systems form
4th week
Uterus is the size of a hen’s egg. Mother feels frequent need to urinate due to pressure of growing uterus on bladder
5th week
Uterus is the size of an orange
6th week
Uterus is the size of a grapefruit
3rd month
Uterus can be felt above the pubic bone
2nd month
Embryo is curved. head is large. Limb buds show divisions. Nose, eyes, and ears are noticeable
5th week
Fingers and toes are present. Skeleton is cartilaginous
6th week
All systems are developing. Bone is replacing cartilage. Facial features are becoming refined. Embryo is about 38 mm (1 1/2 in) long
2nd month
Gender can be distinguished by ultrasound. Fingernails appear
3rd month
Fetal movement is felt by a mother who has previously been pregnant
4th month
Skeleton is visible. Hair begins to appear. Fetus is about 150 mm (6 in) long and weighs about 170 g (6 oz)
4th month
protective cheesy coating, called VERMIX CASEOSA, begins to be deposited. Heartbeat can be heard
5th month
Fetal movement is felt by a mother who has not previously been pregnant. Uterus reaches up to level of umbilicus, and pregnancy is obvious
5th month
A doctor can tell where a baby’s head, back, and limbs are. Breasts have enlarged, nipples and areolae are darkly pigmented, and colustrum is produced
6th month
Body is covered with fine hair (called lanugo). Skin is wrinkled and reddish
6th month
Uterus reaches halfway between umbilicus and rib cage
7th month
Body hair begins to disappear. Subcutaneous fat begins to be deposited.
8th month
Uterus is up to rib cage, causing shortness of breath and heartburn. Sleeping becomes difficult
9th month
