Obstetrics Part 1 Flashcards
What are the ovaries?
Female Gonads/ Sex glands.
Where are the ovaries located?
One of each side of the uterus.
What do the ovaries do?
Secrete the hormones estrogen and progesterone and develop and release a mature egg.
What is the ovum?
The ovary that is released each month.
Explain Ovulation
During the first 7 days of the menstrual cycle, follicles grow. These follicles secrete estrogen into the bloodstream to prepare the uterus lining. On day 7 the follicles stop growing and degenerate except for one that continues to grow. One of the fallopian tubes surrounds the follicle. The follicle bursts open ejecting the egg. The fimbria (the tiny projections of the fallopian tube) sweep the egg inside the fallopian tubes. Contractions move the egg to the uterus.
What are the fallopian tubes?
Thin flexible tubes that extend from the uterus to the ovary.
What is the Uterus?
A pear-shaped organ that contains the developing fetus.
The three sections of the uterus?
The fundus (top), corpus (body), and the Isthmus (cervix).
What is the plug of mucus?
A plug that seals the uterine opening; preventing contamination from entering the uterus. The plug is discharged when the cervix begins to dilate. Signaling the first stage of labor, the “bloody show”.
The three layers of the uterus?
Endometrium (innermost lining), Myometrium (thick middle layer), and Perimetrium (outer layer)
What is the placenta and what does it do?
A disk-shaped organ that provides fetal nourishment and waste removal.
What does the umbilical cord do?
Delivers the nutrients and oxygen to the fetus. The umbilical vein carries oxygen and nutrients to the fetus. 2 umbilical arteries carry deoxygenated blood from the fetus to the placenta.
What is the amniotic sac?
A sac filled with amniotic fluid in which the baby floats, insulating and protecting the baby.
How much amniotic fluid is in the amniotic sac?
500-1000 ml of amniotic fluid.
What is the vagina?
An opening to the outside for the baby. Extends from the cervix to an external opening of the body.
What is crowning?
When the top of the baby’s head appears at the vaginal opening. This means the baby is coming, no matter what; you will be giving birth very very soon.
Stages of the menstrual cycle?
Throughout 28 days, the menstruation cycle occurs. The first day begins with menstruation (bleeding due to the endometrium shedding). On day 14 ovulation occurs (release of the ovum) and the endometrium thickens. The egg is either fertilized or not.
What is gestation?
Pregnancy.
What is gestational age?
The age of the fetus in weeks.
Pre-embryonic phase
For the first 14 days of pregnancy.
Embryonic phase
15 days to 8 weeks of pregnancy.
Fetal stage
8 weeks of pregnancy to birth.