Embryonic Develoment

Question 1

Carnegie collection of embryos

Answer 1

standardized time points of embryo development

designated by developmental events.

goes to stage23 or day 60 when embryo becomes fetus

Question 2

stage 10

Answer 2

embryo is visible to naked eye, day 19, 20, 21

Neural tube begins to end. represents one of the final stages of dev of cns

Question 3

stage 19

Answer 3

day 40 or 41. embryo lengthened and torso straighter. Dev. external ear, give rise to knee joint and hip joint, and mandible.

In cleft palate, we will know at this stage

Question 4

stage 23

Answer 4

last stage bc fetus after. head is 50 percent of size bc of rapid growth of brain and skull. Grows rapidly because receives first dibs on oxygenated blood thru maternal circulation, chin, extremities lengthening, still undifferentiated sexually

Question 5

Embryonic Period

Answer 5

Cargniae stages
weeks 3-8
-Maximum susceptibility to developmental defects due to initiation of organ sys. development !!
- teratogens most devastating

Question 6

Fetal Period

Answer 6

• Weeks 9-full term (40 weeks)
• Organs continue to grow/develop and increase in complexity
• Less of a chance of significant abnormalities
• not laying new foundations
• teratogens cause less damage

Question 7

Post Natal Development

Answer 7

occurs from birht to puberty

Question 8

3rd week

Answer 8

cardiovascular system begins to develop, 1st system to function in embryo. Somites begin to develop so beginning to develop muscullar and skeletal muscle

Question 9

4th week

Answer 9

Primordial gut forms - if exposed to tetragens then could have bad effects on GI tract
Neurulation begins
Urogenital system begins to form
Upper and lower limbs begin to form

Question 10

5th week

Answer 10

CSF forms
Rapid brain development - dev of giri and sulci to increase surface area
Midgut and hindgut develop