Embryo final

Question 1

Phases of mitosis

Answer 1

1. Interphase
2. Prophase
3. Prometaphase
4. Metaphase
5. Anaphase
6. Telophase
7. Cytokinesis

Question 2

Meiosis takes place in

Answer 2

Germ cells

Question 3

Interphase is when we duplicate the DNA

Answer 3

So in meiosis we only have one phase of Interphase.

Question 4

Spermiogenesis is

Answer 4

the transformation of Spermatids into Spermatozoa

Question 5

What happens in the transformation of spermatids into spematozoa

Answer 5

formation of the acrosome, which covers half of the
nuclear surface and contains enzymes to assist in
penetration of the egg and its surrounding layers
during fertilization

condensation of the nucleus

formation of neck, middle piece, and tail

shedding of most of the cytoplasm.

Question 6

Corpus letuem produces

Answer 6

Progesterone

Question 7

Spermatozoa must undergo……….. to able to fertilize

Answer 7

1. capacitation

2. Acrosome Reaction

Question 8

Acrosin enzyme function

Answer 8

allows sperm to penetrate the

zona

Question 9

Inner cells of the morula are called

Answer 9

Embryoblast

Question 10

Outercells of the Morula are called

Answer 10

Trophoblast

Question 11

Implantation happens in

Answer 11

Epithelial cells of the uterine mucosa

Question 12

The wall of the uterus consists of three layers:

Answer 12

endometrium or mucosa lining the inside wall

myometrium, a thick layer of smooth muscle;

perimetrium, the peritoneal covering lining the outside wall

Question 13

Which layers of the endometrium disappear at the menstrual phase

Answer 13

Spongy and compact layers.

Question 14

Epiblast gives rise to

Answer 14

1. Amniotic cavity

2. amnioblast cells which are the roof of the amniotic cavity

Question 15

Amniotic cavity floor and roof

Answer 15

floor: epiblast cells
roof: amnioblast cells

Question 16

exocoelomic

(Heuser’s) membrane

Answer 16

appears in the hypoblast

Question 17

Extraembryonic mesoderm is Formed by

Answer 17

Cytotrophoblast

Question 18

Syncytiotrophoblast is formed by

Answer 18

Cytotrophoblast

Question 19

extraembryonic mesoderm arises

Answer 19

1. extraembryonic splanchnopleuric mesoderm, which covers the yolk sac and the germ disc
2. extraembryonic somatopleuric mesoderm, which covers the amniotic cavity and lines the inner aspect of the cytotrophoblast.

Question 20

Chorion

Answer 20

The extraembryonic somatopleuric mesoderm together with the surrounding cytotrophoblast and syncytiotrophoblast form

Question 21

DON’T MESS UP THE NOTIONS!!

Answer 21

-bilaminar or trilaminar germ disc is not the same with bilaminar and trilaminar blastocyst stage.

Question 22

Implantation site

Answer 22

anterior or posterior surface of uterus
Abnormal sites: abdominal cavity, Douglas pouch,
uterine tube (mostly ampulla)-95% of
extrauterine/ectopic pregnancies, omentum, ovary
When the blastocyst implants close to the internal
opening of cervix, resulting placenta praevia –
severe bleeding during second part of pregnancy
and delivery.

Question 23

Mesoderm

Answer 23

refers to cells derived from the epiblast and extraembryonic tissues.

Question 24

Mesenchyme

Answer 24

refers to loosely organized embryonic connective tissue regardless of origin.

Question 25

At its cephalic end, the foregut is temporarily bounded by

Answer 25

buccopharyngeal membrane

Question 26

vitelline duct is

Answer 26

The way of communication for the midgut and yolk sac

Question 27

Duration pf pregnancy

Answer 27

280 days, or 40 weeks after the onset of the last normal menstrual period.
266 days or 38 weeks after fertilization.

Question 28

Fetal period is

Answer 28

9th week to birth

Question 29

During the 6th week

Answer 29

intestinal loops cause a large swelling (herniation) in the umbilical cord,

Question 30

placental membrane layers

Answer 30

the endothelial lining of fetal vessels;

the connective tissue in the villus core;

the cytotrophoblastic layer;

the syncytium

Question 31

primitive umbilical ring

At the fifth week of development, the following structures pass through the ring

Answer 31

1. connecting stalk,
2. yolk stalk (vitelline duct)
3. canal connecting intraembryonic and extraembryonic cavities