Fertilisation and fetal development Flashcards
1
Q
Stages of development
A
Zygote - initial cells formed by two gamete cells joined following fertilisation
Embryo - developing of mass cells from implantation until 8 weeks
Fetus - developing baby after embryonic stage and before birth (9th week)
2
Q
Week 1
A
Zygote, morula, blastocyst
Blastocyst differentiates into trophoblast and inner cell mass implantation occurs
3
Q
Week 2
A
- hCG secreted
- blood vessels begin to form
- amniotic and chorionic cavities from
4
Q
Week 3
A
- primitive nervous system
- heart cells twitch
- eye and ear differentiation
- RBC develop
- Key brain, heart, foregut and handout
5
Q
Week 4 - embryonic period
A
- heart begins to pump blood
- brain division
- primitive ear
- neural tube fusing
- lungs and gastrointestinal system begin forming
6
Q
Weeks 5-6
A
- rapid brain growth
- umbilical cord formed
- limb buds differentiate
- liver begins to function
- reflex response to touch
7
Q
Week 7
A
- liver pro inent
- growing intestines herniate out of abdominal cavity into umbilical cord
- eye lids form
- diaphragm develops
8
Q
Week 8
A
- hands and feet formed
- 4 chambers to heart (40-60bpm)
- major blood vessels formed
- circulation through umbilical cord
- external genitalia visable
9
Q
System formation
A
Urinary - producing and passing urine by 10/40
Gastrointestinal - swallowing amniotic fluid by 16/40
Respiratory - formed by 17-24/40
10
Q
Eyes and Ear formation
A
eyes - developed by week 13, eyelids remained fused until week 24
ears - fully formed and functioning by 20/40
11
Q
Placenta at term
A
Protection Immunological Nutrition Respiration Excretion Endocrine
