prenatal growth & functional dev

Question 1

Stages of prenatal growth

Answer 1

Period of the egg
period of the embryo
period of the fetus (longest)

Question 2

Cell division in the period of the egg

Answer 2

*first 2wks after fertilization
1- Morula
2- blastocyst
3- implantation
4- Differentiation of cellular layers

Question 3

Millestones in period of embryo

Answer 3

• wks 3-8
  -differentiation of stem cells into specific cell types
  -organization of cell types into tissues –>organs
  -by end of period all basic anatomic and physiologic features established

Question 4

Differentiation of stem cells into specific cell types

Answer 4

• totipotent (whole)
• Pluripotent (many)
• Multipotent (several)

Question 5

Targets in period of the fetus

Answer 5

*wks 9-40
- changes in proportions
- functional dev of
1- tissues
2- organs
3- systems

Question 6

growth characteristics

Answer 6

sigmoid curve
10-12% birth weight wk 20
50% length wk 20

Question 7

What period features major changes in proportions of body segment

Answer 7

Fetal period
- head
- trunk
- lower extremities

Question 8

Fetal motor activity gestational age specific

Answer 8

• neuromuscular changes, primary reflexes,
  muscle tone,
  reactivity,
  Motility
  sensorimotor behaviour

Question 9

what wks they start to move

Answer 9

wk 12
kick wk 20