Prenatal, Perinatal & Parental Transitions Flashcards
Gametes
• Sperm: 200-300 million cells daily & begins in puberty
• Eggs: 400,000 immature cells & are present at birth
- only 400-500 mature
Conception
- Sperm meets ovum (unfertilized egg) & fertilization occurs
* Both biological parents contribute 23 chromosomes
Pathways to parenthood: Deciding
- lifestyle they want to live
- heritable diseases
- egg count & egg health of female
- sperm count & sperm health of male
- same sex partner
- single parent?
Ways to parenthood
- Intercourse
- Artificial insemination
- Gamete intrafallopian transfer
- Invivo fertilization
- Invitro fertilization
- Surrogate mother
- Adoption
Artificial Insemination
• Sperm donor
Invitro fertilization
- eggs removed from ovulary & put in petri dish, then transfer embryo to the uterus.
- people do this when the fallopian tube is damaged
- unknown infertility
- females with ovulation disorders
- tubes tied
Gamete intrafallopian Transfer (GIFT)
- Fertilization happens in the tube and not in the lab
- Egg & sperm transfered into the fallopian tube
- Tubes must be healthy
Invivo fertilization
Fertilization that occurs in the womb
What are the effects of assistance in reproduction
- Higher likelihood of multiples
* Increased rate of preterm & low birth weight in babies
Adoption as an option
- If the parents are infertile
* Mother possibly may not want to deal with uncontrollable changes in the body
Prenatal Developmental Stages
- Zygotic/Germinal Stage (conception-2 weeks)
- Embryonic Stage (2-9 weeks)
- Fetal Stage (9 weeks-38 weeks)
Zygotic/Germinal Stage
- Sperm penetrates egg =fertilization
- Once fertilization occurs and a zygote (fertilized egg) is created outside of egg thickens so that no other sperm enters the egg
- Zygote to the fallopian tube & cell division begins
- Implantation in uterus occurs
- Blastocyst= balls of cells form
- Inner cell= becomes embryo
- outter cell= tropoblast (placenta & chorion)
Zygotic/Germinal Stage: Blastocyst: Inner cell
Becomes embryo
Zygotic/Germinal Stage: Blastocyst: Outter cell (tropoblast)
Support system in pregnancy: placenta & chrorion
Embryonic Stage
- Support system
- Period of rapid development (sensitive, practically critical period)
- Period most at risk from teratogens
- Fetal Membranes
Fetal Membranes in Fetal Stage
- Amnion inside chorion
- Chorion = gives rise to placenta
- Amnion = cushions & protects fetus
Ectodermin Fetal Stage
- skin
- sensory
- organs
- brain
- spinal cord
Mesoderm in Fetal Stage
- Muscles
- Blood
- Bones
- Circulatory system
Endoderm in Fetal Stage
- Respiratory
- Digestive
- Liver
- Pancreas
Organogenesis in Fetal Stage
- development of organs
- heart begins to beat
- miscarriage is common (50-80% due to chromosomal abnormalities)
- Cephalocaudal direction of development
Cephalaudal development
• Development from the head down through the lower part of the body
Fetal development (9 weeks-38 weeks)
- can tell sex
- muscular development
- Quickening (kicking)
- facial features
- development of senses
- sucking, swallowing, hiccups (5 months)
- eyes open & close (6 months)
- Brain connections
Age of Viability (6.5 months/28 weeks)
- immature systems
- lung development
- respiratory system of most control
Fathers prenatal experience
- support for mother: emotionally, physically & financially
- sympathetic pregnancy: experience some symptoms of pregnancy
- 11-65% men experience weight gain, mood swings, etc.,
Having a healthy pregnancy
- prenatal pregnancy
- prenatal medical care
- maternal diet
- stress management