PSYB21H3 Chapter Notes - Chapter 3: Antipsychotic, Endangerment, Fluoxetine
Document Summary
Gestation- the prenatal period of development, between conception and birth: normal ranges is between 37 and 41 weeks. Takes place in 3 different stages: germinal, embryonic, fetal. The cephalocaudal principle: from latin meaning head to tail, dictates how development proceeds from head to lower part of the trunk: head, brain, and eyes develop earliest and are disproportionately large until the other parts, catch up. At two months of gestation, the embryo"s head is half the length of the body. By the time of birth, the head is only one-fourth the length of the body but is still disproportionately large. Germinal stage: includes the first two weeks of development after fertilization. The zygote divides, becomes more complex, and is implanted in the wall of the uterus. After 36 hours of fertilization, the zygote enters a period of rapid cell division and duplication (mitosis: after 72 hours after fertilization, it has divided into 16 to 32 cells.
