Embryonic Stage Extends from week _ – – Major external body structures appear

Week Two Amniotic cavity forms ________________________________ changes to embryonic disk

Week Three Layers from – Outer layer: _ – Inner layer: _ Linings of digestive respiratory, urinary and reproductive tracts – Middle layer: _ – These are the primary germ layers. _

Week Four Chorionic villi form Embryonic disk changes into a _ Head and jaws appear

Weeks Five through Seven Eyes, nose, mouth Fingers and toes By end of week seven_

Umbilical Cord Begins at umbilicus of embryo – Three vessels

Amniotic Fluid Provides a _ Provides _

Amniocentesis Performed after week _ Needle inserted into amniotic sac – Can determine _

Week Eight Embryo is usually 30 mm long and weighs 5 grams Disturbances to _____________________________ stage can cause major malformations or malfunctions

Fetal Stage From end of _ Month Three: – Rapid growth – Body proportions change – – By week 12, _

Month Four Skeleton continues to ossify Fetus has _ Still has _

Month Five Growth slows Mom can feel _ – Lanugo: – Vernix caseosa:

Month Six More weight gain Month Seven –

Final trimester Fat _ Digestive and respiratory tracts mature

Neonatal period Begins at birth – Breathing (first breath) Stimulated by _ Decreasing _ Low _ Decrease in body temperature

Neonatal period Energy – Fetus: _ – Neonate: Rich in _ Newborns will use _

Neonatal Foramen ovale – Used to allow blood from _ – Closes due to _______________________________ after birth Valve gradually fuses closed

Ductus arteriosus In fetus: – Allows blood in _ – Neotanal: Constricts and _

Infancy From week four _ Rapid growth: may _ Eruption of _ Increased coordination

Infant nutrition requirements – new tissues – bones and skeletal structures – blood cell formation – cartilage and bone

Childhood From end of first year _ – High rate of growth – – Speech – Reason

Adolescence Between puberty and adulthood – Anatomical and physiological changes that result in _ – Female puberty begins ________________________ …will be taller, stronger than male peers …until male puberty

Adulthood Maturity From adolescence to old age Male, age 18 – Producing ____________________________ for his lifetime 20’s: – – Hair _

Adulthood 30’s: – Hearing _ – Heart muscle thickens – Loss of ligamentous _ 40’s: – Metabolism _ – Vision _ – – Immune system less efficient

Adulthood 50’s – – __________________________________ may lead to diabetes

Adulthood 60’s – 70’s – Loss of _ – Skin loses integrity – Cartilage continues to grow: _

Senescence ______________________ is the _ Result of __________________________ over years – Decline of sensory functions more evident

Death Following senescence, _