FMLY 1010 Lecture 15: Lecture 15

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University of Manitoba
Family Social Sciences
FMLY 1010
Christine A.Schippers

OD88729 Eyes have corneas and lenses Lungs begin to develop Week 6: Brain produces patterns of electrical activity Gonads = sex glands (ovariestestes) develop At first, male and female gonads are identical Betweenweeks46,genesonYchromosomecausemaleembryotoproducetestosterone Causes gonads to become testes Absence of testosterone, gonads become ovaries Week 7: Male embryo develops a penis Embryo begins to move spontaneously Visible skeleton, fully developed limbs Bones begin to harden, muscles mature Embryo can maintain semiupright posture Eyelids seal shut to protect developing eyes Ears completely formed, xray can detect teeth buds in jawbones Week 8: Last week of embryonic stage o Liver and spleen begin to function o Allow embryo to make and filter its own blood cells o Heart is well developed, efficiently pumps blood o Movements increase as electrical brain activity becomes organized o Connections between brain and rest of body are well established o Digestive and urinary systems begin functioning Organogenesis = process of organ development is complete Fetal Stage Fetal stage = 3 rd stage of prenatal development from week 9birth, during which growth and organ refinement take place Fetus grows from 2grams and 2.5cm to 3.2kg and 50cm Refinements of lungs and brain in particular Viability = ability of the fetus to survive outside the womb Small number of fetuses reach viability at week 23 o Remaining in the womb until week 24 greatly increases chance of survival 24 weeks = average age of viability The Fetal Brain Most finetuning of brain takes place during fetal stage Neurons begin to develop during embryonic stage (week 3), but neuron formation pace increases dramatically between 10 th 18 thweeks = neuron proliferation Cell bodies = part of a neuron that contains the nucleus and is the site of vital cell functions
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