psyc ch 3

a fluid filled ball

cells inside the blastocyst, that will become the new organism

the thin outer ring of cells, that will become the structures that provide protective covering and nourishment

between 7 and 9 days the blastocyst burrows deep into the uterine lining

a membrane that encloses the developing organism in amniotic fluid

helps keep the temperature of the prenatal world constant and provides a cushion against any jolts caused by a womans movement

protective membrane which surrounds the amnion from which tiny finger like blood vessels emerge

brings the mothers and the embryos blood close together it permits food and oxygen to reach the developing organism and waste products to be carried away

first appears as a primitive body stalk and during the course of pregnancy, grows to a length of 1 to 3 feet, it contains one large vein that delivers blood loaded with nutrients and two arteries that remove waste

lasts from implantation through the eighth week of pregnancy. During these six weeks the most rapid prenatal changes take place as the groundwork is laid for all body structures and internal organs

spinal cord at 3.5 weeks the top swells to form the brain

from the 9th week to the end of pregnancy, the developing organism increases rapidly in size especially from the ninth to twentieth week

white cheeselike substance that protects the skin from chapping in the amniotic fluid

white downy hair that appears over the entire body and helps the vernix stick to the skin

the point at which the baby can first survive ... sometime between 22 and 26 weeks

any environmental agent that causes damage during the prenatal period

a term that encompasses a range of physical, mental and behavioral outcomes caused by prenatal alcohol exposure

• slow physical growth
• thin upper lip
• brain injury

in which at least three areas of mental functioning are impaired despite typical physical growth and absence of facial abnormalities

when mother and fetuses blood type doesn't match