embryonic stage extends from week _ – – major external body structures appear
TRANSCRIPT
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, _