PSY 2114 Lecture Notes - Lecture 3: Neural Tube Defect, Ectopic Pregnancy, Leg Before Wicket

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2114
• Professor: Heather Poole

Document Summary

Gestation = 40 weeks (usually 37 to 42); the time since the mother"s last period is gestation age: broken down into 3 trimesters only conceptual. Fertilization age is the actual duration of the growth of the fetus (normally 38 weeks) Stages 3 stages discriminated by the qualitative differences in development. Brain, organs, and limbs start to form. Embryonic disc forms 3 cells layers: ectoderm nervous system and skin, mesoderm muscles, skeleton, circulatory, internal organs, endoderm digestive system, lungs, urinary tract, glands. Cardiovascular system develops and circulation starts: heart is 1st major organ to start functioning, heart rate is 2x adults (120-180bpm) Skeletal development (cartilage) next: limb buds with the first bone cells, teeth form under gums. At the end, all major systems are present. Embryo has complete human form and can sense its world: fetal period (fetus) Eyes: eyeballs and optic nerves present by 3rd month, eyelids form at 9 weeks, fetus sensitive to light at 16 weeks.