Pre-Embryonic and Embryonic Phase

Question 0

Where does fertilization normally occur?

Answer 0

Outer third of the Fallopian tube

Question 1

Also known as the fertilization, occurs when the sperm nucleus enters the nucleus of the oocyte.

Answer 1

Conception

Question 2

The fertilized oocyte is called the what? And contains the diploid number of chromosomes 46.

Answer 2

Zygote

Question 3

The single cell zygote undergoes mitotic cell division known as

Answer 3

Cleavage

Question 4

Three days after fertilization, the zygote forms into a 16 cell, solid sphere that is called

Answer 4

Morula

Question 5

Around day 5 the developing zygote is now known as the blastocyte and enters the

Answer 5

Uterus

Question 6

This blastocyte is composed of an inner cell mass called the

Answer 6

Embryoblast that develops into the embryo

Question 7

The outer cell mass of the blastocyte is known as the

Answer 7

Trophoblast

Question 8

The trophoblast becomes part of the

Answer 8

Placenta

Question 9

Refers to more than one developing embryo such as twins or triplets

Answer 9

Multiple gestation

Question 10

The embedding of the blastocyst into the endometrium of the uterus, begins around day 7-10 days is called what?

Answer 10

Implantation

Question 11

What stimulates the endometrium of the uterus, which becomes thicker and more vascular in preparation for implantation?

Answer 11

Progesterone

Question 12

How long does it take for the sperm to reach the oocyte?

Answer 12

A few hours

Question 13

How many sperm make it to the oocyte?

Answer 13

2000

Question 14

Sperm penetration of the ovum takes how long?

Answer 14

20-30 seconds

Question 15

This is produced several days after implantation and alters the mucus membranes and becomes

Answer 15

Decidua

Question 16

The decidua is under control of the HCG secreted by trophoblast. This prevents menstrual sloughing, encourages growth and thickness and vascularity of endometrium and protects and nourishes the embryo. After birth it is called

Answer 16

Lochia

Question 17

What are the three portions of the decidua?

Answer 17

Decidua capsularis (covers the blastocyst) 
Decidua basalis (directly under the implanted embryo and forms the placenta) 
Decidua Vera (lines the rest of the uterus)