Development Flashcards
Oogensis
Production of eggs
Spermatogenesis
Production of sperm
Meiosis
Half the N number and shuffle DNA
Morula
Ball of cells that reaches uterus
Blastula
Hollow tube of cells
Implantation
When embryo forms a placenta in uterus wall
Embryonic period
First 8 weeks ( before organs develop )
Organogenesis
Organs form in the embryo
Fetus
About 8 weeks
Looks like human
Prenatal
Changes before birth
Postnatal
Changes after birth
Fertilization
Union of egg and sperm
In upper third of uterine tube
Takes about 1 hr
Sperm penetrate eggs …
Corona radiate then zona pellucida
Fertilization membrane
Forms around egg to block out more sperm
Differentiation
Cells change and divide
Uterus lining
Endometrium
Blastocyst
Ball of cells and implanted in uterus lining
Endoderm
Germ layer forming the epithelial linings of the digestive tract respiratory tract urinary bladder and urethra
Mesoderm
Germ layer forming all muscle tissue, bone, blood vessels, lymph vessels, connective tissue, reproductive organs, kidneys, and epithelial linings of the body cavities
Ectoderm
Germ layer forming the nervous system, sensory organs, epidermis, hair, nails, skin glands, and linings of the mouth and anal canal
Gastrulation
The primitive streak folds inward
Neurulation
CNS forms
Chorion villi
Fingerlike projections in the placenta into the endometrium
Lacunae
Pools of maternal blood that the villi need for diffusion of nutrients
Placental blood barrier
membrane that separates maternal and fetal blood
Umbilical cord
Connects embryo to placenta
Can survive without life support at ____ weeks
36
Parturition
Birth process
Increases in estrogen form these contractions
Braxton-Hicks
Hormone that causes labor to begin
Oxytocin
Labor
Fetus moves through birth canal
Stages of labor
- Until cervix is dilated 10 cm
- Exit of fetus
- Placenta is pushed out
Colostrum
First milk secreted that has antibodies to protect the baby
Neonate
Newborn to 1yr
Rapid growth
Childhood
2-10yrs
Learning stage
Fat deposits are lost
Adulthood
Verticals growth stops
Metabolic rate decreases
Senescence
Old age
65-75yrs