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Maternal Child Nrsng

The development of ova in the woman and sperm in the man. gametogenesis
formation of female gamete Oogenesis
formation of male gamete spermatogenesis
the process in which cells divide to form gametes meiosis
When does ovulation occur? 14 days before a womans next menstrual cycle would begin
where is the mature ovum released? on the surface of the ovary where it is picked up by the fallopian tube and transported through the tube and awaits fertilization
when does the ovum enter the uterus 3 days after its release from the ovary
How long does sperm last after ejaculation? most survive no longer than 24 hours, but few may remain fertile for up to 5 days
Are sperm immidiatly ready to fertalize the ovum? No. During the trip to the ovum, they undergo changes that enable one of the to penetrate the protective layers surrounding the ovum, a process called capacitation.
When does fertilization occur? when one spermatozoon enters the ovum and the 2 nuclei containing the parents chromosomes merge.
When sperm enters the ovum, where is the ovum fertilized? the distal third of the fallopian tube near the ovary
Describe the process of fusion between the sperm and ovum The 23 chromosomes from the sperm unite with the 23 chromosomes from the ovum restoring the total number to 46
When is fertilization complete and cell division can begin? when the nuclei of the sperm and ovum unite
The pre-embryonic period First 2 weeks after conception
What happens around the 4th day after conception? The fertilized ovum, now called a zygote, enter the uterus
When a zygote divides until it reaches 16 cells , it is called a... morula
Describe the entry of the zygote into the uterus 1) When the blastocyte contains approx. 100 cells, it enters the uterus. 2) it lingers in the uterus another 2-4 days before beginning implantations. Cont next slide...
Cont from previous slide... 3) The endometrium, now called the decidua, secretes rich fluids to nourish the zygote before placental circulation is established.
What is critical for the implantation in the decidua fro continued development? Proper time and place in the uterus
When does the implantation in the decidua happen? between the 6th and 10th day after conception.
Why does the zygote secret HCG? To signal that the woman requires a continuing supply of estrogen and progesterone to tell the body that a pregnancy has begun
Why is the site of implantation important? Because that is where the placenta develops
Where does normal implantation develop? In the upper uterus, slightly more often on the posterior wall than the anterior wall.
What will form to nourish the zygote by diffusion because the circulatory system is not yet developed? Primary chorionic villi. The villi will eventually form from the fetal side of the placenta
When is the zygote embedded with the uterus? 10 days
The beginning of the 3rd week through the 8th week is considered to be the... Embryonic period
What are teratogens? drugs, viruses, radiation and infectious agents
Zygote cell formed by union of sperm and ovum
embryo 3rd-8th week of development
fetus 9th week until birth
What are the 3 primary cell layers that differentiate during the embryonic stage ectoderm, mesoderm, endoderm...GROWTH IS RAPID
What body segments appear in the 3rd week of prenatal development? neural tube forms, primitive brain, primitive spinal cord and a primitive or tubular heart begins beating at 22 to 23 days.
Embryo charecteristics in prenatal development week 4 C shaped with tail and head, neural tubes closed, ears and eyes are apparent, upper extrmities appear as buds, partitioning of the heart into 4 chambers begins, esophagus and trachea seperate
Embryo charecteristics in prenatal development week 5 Heart is beating and continuing to develop into 4 chambers, limbs continue to form
Embryo charecteristics in prenatal development week 6 Heart has 4 chambers, facial development begins with eyes, ears, and nasal pits
Embryo charecteristics in prenatal development week 7 Face is more human looking, eyelids begin to form, fast intestinal growth
Created by: chriskelley
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