PSYB32H3 Chapter Notes - Chapter 3: Neuroscience, Parasitic Disease, Stillbirth
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Conception usually takes place during ovulation or within a few days of it. Pregnancy occurs in three trimesters; three periods of continuous development beginning with a. Stages of prenatal development zygote, which develops into an embryo, and then into a fetus. *figure 3-1: at almost 2 months, the embryo begins to look like a person. Amniotic sac thin membrane around organism that contains amniotic fluid fluid that embryo floats in and serves as protective buffer. Placenta fleshy, disk-like structure formed from the tendrils that attach the embryo to the uterine wall. Ectoderm from which hair, nails, parts of the teeth, outer skin layer, skin glands, sensory cells, nervous system develop. Mesoderm forms muscles, skeleton, inner skin layer, circulatory and excretory systems. Endoderm from which gastrointestinal tract, trachea, bronchia, eustachian tubes, glands, and vital organs develop: embryo is most susceptible during this period to environmental assault, prenatal development is guided by.
