Chapter 3 - CHAPTER 3 STAGES OF PRENATAL DEVELOPMENT THE...

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CHAPTER 3 STAGES OF PRENATAL DEVELOPMENT THE ZYGOTE ZYGOTE: FERTILIZED EGG THE DEVELOPING ORGANISM FROM THE TIME THE SPERM AND THE EGG UNITE TO ABOUT THE 2 ND WEEK OF GESTATION; IMPLANTATION OF THE FERTILIZED EGG IN THE WALL OF THE UTERUS THE EMBRYO EMBRYO: DEVELOPING ORGANISM BETWEEN THE 2 ND AND 8 TH WEEK OF GESTATION THE EMBRYONIC PERIOD COMPRISES THE DIFFERENTIATION OF THE MAJOR PHYSIOLOGICAL STRUCTURES AND SYSTEMS GESTATION: TERM FOR THE ENTIRE PERIOD OF DEVELOPMENT IN THE UTERUS DURING THE EMBRYONIC PERIOD INFANT GROWS 2 MILLION % IN SIZE 3 CRUCIAL STRUCTURES DEVELOP TO PROTECT AND SUPPORT THE GROWING LIFE WITHIN THE MOTHERS UTERUS AMNIOTIC SAC: CONTAINS THE DEVELOPING ORGANISM AND THE AMNIOTIC FLUID SAC AND FLUID PROTECT THE ORGANISM FROM PHYSICAL SHOCKS AND TEMPERATURE CHANGES PLACENTA: FLESHY, DISKLIKE STRUCTURE FORMED BY CELLS FROM THE LINING OF THE UTERUS AND FROM THE ZYGOTE THAT, TOGETHER WITH THE UMBILICAL CORD, SERVES TO PROTECT AND SUSTAIN THE LIFE OF THE ORGANISM
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UMBILICAL CORD: TUBE THAT CONTAINS BLOOD VESSELS CONNECTING THE GROWING ORGANISM AND ITS MOTHER BY WAY OF THE PLACENTA CARRIES OXYGEN AND NUTRIENTS TO THE INFANT AND REMOVES CARBON DIOXIDE AND WASTE PRODUCTS PRENATAL DEVELOPMENT IS GUIDED BY TWO PRINCIPLES: CEPHALOCAUDAL: DEVELOPMENT PROCEEDS FROM THE HEAD DOWNWARD TO TRUNK AND LEGS PROXIMAL-DISTAL: GROWTH OCCURS FIRST IN THE CENTRAL AREAS, SUCH AS INTERNAL ORGANS, AND THEN TO ARMS AND LEGS MISCARRIAGES NATURAL OR SPONTANEOUS END OF PREGNANCY BEFORE THE INFANT IS CAPABLE TO SURVIVE OUTSIDE THE WOMB EMBRYO BECOMES DETACHED FROM THE WALL OF THE UTERUS AND IS EXPELLED THROUGH THE VAGINAL CANAL THE FETUS FETUS: PERIOD FROM THE 3 RD MONTH OF GESTATION TO DELIVERY BODILY STRUCTURES AND SYSTEMS DEVELOP TO COMPLETION LANUGO: SOFT HAIR THAT COVERS BODY FROM GESTATION ON AT 6 MONTHS, CANNOT PRODUCE AND MAINTAIN ENOUGH SURFACTANT (LIQUID THAT ALLOWS LUNGS TO TRANSMIT OXYGEN FROM AIR TO BLOOD RESPIRATORY DISTRESS SYNDROME: LACK OF SURFACTANT LABORED BREATHING AND BLUISH DISCOLORATION OF
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This note was uploaded on 11/03/2009 for the course PSY 0310 taught by Professor Strauss during the Fall '08 term at Pittsburgh.

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Chapter 3 - CHAPTER 3 STAGES OF PRENATAL DEVELOPMENT THE...

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