20 Development (Lecture) 8

Question 1

Prenatal

Answer 1

growth prior to birth 9 mo

Question 2

Trimesters

Answer 2

3 mo x 3

Question 3

Pre-Embryonic phase begins ? and ends?

Answer 3

Begins at fertilization and ends at implantation

Question 4

*Fertilization

Answer 4

occurs in ampulla of fallopian tube union of sperm and egg.

Question 5

*Zygote

Answer 5

is a fertilized egg

Question 6

First 30 hours after fertilization

Answer 6

nothing happens

Question 7

*Cleavage

Answer 7

cell divsion with out cell growth

Question 8

*Morula

Answer 8

solid ball of cells that enters the uterus

Question 9

*Blastocyst

Answer 9

hollow sphere with a small mass of cells floats in uterus. this is what implants into wall of uterus.

Question 10

Gestation / Pregnancy begins…

Answer 10

at implantation

Question 11

*Extra-embryonic membranes

Answer 11

Amnion, Yolk, Chorion (external)

Question 12

Amnion (internal)

Answer 12

fluid filled sack that embryo developes in

Question 13

Yolk

Answer 13

structure that will produce embrionic blood

Question 14

Chorion (external)

Answer 14

membrane across which mother and baby exchange material becomes placenta

Question 15

Gastruation

Answer 15

genectic specialization of embrionic cells

Question 16

Allantois

Answer 16

This is the 4th extra embrionic membrane. this will serve as a temporary bladder for waste. later it becomes part of the cord.

Question 17

Limb buds

Answer 17

4 weeks becomes arms and legs

Question 18

Embryonic heart contractions

Answer 18

4 weeks

Question 19

*Fetal phase

Answer 19

begins at week 8

Question 20

*All organ systems present after

Answer 20

8 weeks

Question 21

Ossification occurs week 8

Answer 21

cartilage becomes bone

Question 22

Monozygotic twins

Answer 22

Identical zygote splits

Question 23

Dizygotic twins

Answer 23

ferternal two eggs