PSY 2105 Study Guide - Midterm Guide: Amniotic Sac, Neural Tube, Anencephaly

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2105
• Professor: Brenda Baird

Document Summary

Conception: ova travels from ovary to fallopian tube (2 weeks, penetration by one of 300-500 healthy sperm, outcome: single celled zygote. Period of the zygote (weeks 1-2 after conception: the zygote travels down the fallopian tube and it implanted on the uterine wall. Period of the fetus (week 9-birth: differentiation of the ovaries and testes, circulatory system develops, movement felt by mother, week 23-age of viability (ability to survive without mother) Neurogenesis: neural tube-cns base, cns unfolds from head to tail, proximal to distal, subcortical (primitive structures) to cortical (higher functioning behaviour, abnormalities: Spina bi da: posterior neural tube doesn"t close. Migratory problems: in corticogenesis: corpus callosum, subcortical. Nutrition: proper vitamins and minerals needed to support fetus, brain is most affected by nourishment. Mother"s age: old age can cause birth defects: eggs more vulnerable, young age could cause premature birth and have a negative environment after birth. Teratogens: any environmental toxin, usually enters through the placenta.