Unit 4: Development/Life Span Flashcards
Capicitation
This occurs as the sperm moves through the vagina uterus and uterine tubes
Acrosomal reaction
When enzymes are released during the acrosomal reaction as the sperm moves through the reproductive tract
Cortical reaction
Occurs once a sperm penetrates the overtime so that no more sperm can penetrate
Early development
Occurs during the first 0 to 7 days. There is no change in size
Morula
Mitosis without cell growth. Zygote divides by mitosis and forms two cells then four and then eight etc.
Blastocyst formation
Hollow center forms during this stage and is called a blastocyst
Trophoblast firms extra embryonic membranes or placenta, inner cell mass that will become the embryo and blastocele that will become amniotic fluid filled cavity
Endoderm
Inner cell layer of embryonic disc (provide nutrition and forms digestive tract)
Digestive system, respiratory and urinary system
Mesoderm
Middle cel layer of embryonic disk (muscle, bones and connective tissue)
Musculoskeletal and circulatory systems as well as kidneys and gonads
Ectoderm
Outer cel layer of embryonic disk (nervous tissue)
Forms the nervous system and part of the head.
Organogenesis
The development of organs begins during the embryonic stage of development
During the first 35 days of development the embryo is very sensitive to outside influences that may be exposed her mother
Week four of development
Approximately 30-36 days limb buds appear
Week five of development
31 to 35 days. Hands and feet plates appear
Week six of development
36 to 40 days. Finger toes and lips appear
Week 8 of development
56 to 60 days. Linds and Lange gate, face forms; embryo looks human; 3 cm long weighing 2.5 g
Week seven of development
46 to 55 days. Embryo looks mammalian
