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, _