Anatomy- Embryology

Question 1

What days of the menstrual cycle form the menstrual phase?

Answer 1

Days 1-4

Question 2

The secretory or Luteal phase occurs on what days of the menstrual cycle?

Answer 2

Days 15-28

Question 3

The proliferative or follicular phase occurs what days of the menstrual cycle?

Answer 3

Days 4-14

Question 4

What hormone is released to promote development of the follicle?

Answer 4

FSH

Question 5

What causes a surge in LH?

Answer 5

Estrogen

Question 6

What is a zygote?

Answer 6

Diploid cells resulting from union of sperm and ocum

Question 7

What structure consists of 12-15 blastomeres?

Answer 7

Morula

Question 8

What contains a fluid-filled cavity that separates the blastomere into two parts?

Answer 8

Blastula

Question 9

How soon after fertilization does implantation in the endometrial epithelium of the uterus take place?

Answer 9

6 days

Question 10

What forms the wall of the gestational or chorionic sac?

Answer 10

Chorion membranes

Question 11

What forms the floor of the amniotic cavity?

Answer 11

Epiblast

Question 12

What forms the roof of the exocoelomic cavity?

Answer 12

Hypoblast

Question 13

What is the process of bilaminar embryonic disc development into trilaminar embryonic disc called?

Answer 13

gastrulation

Question 14

What are the three trilaminar layers called?

Answer 14

Ectoderm, Mesoderm, Endoderm

Question 15

What germ layer forms epithelial lining of the respiratory tract?

Answer 15

Endoderm

Question 16

What germ layer forms smooth muscle and smooth muscle coat?

Answer 16

Mesoderm

Question 17

What layer forms the blood cells?

Answer 17

Mesoderm

Question 18

What germ layer forms the bone marrow?

Answer 18

Mesoderm

Question 19

What germ layer forms the central and peripheral nervous system?

Answer 19

Ectoderm

Question 20

What germ layer forms connective tissue?

Answer 20

Mesoderm

Question 21

What germ layer forms the CV system?

Answer 21

Mesoderm

Question 22

What germ layer forms the epidermis?

Answer 22

Ectoderm

Question 23

What germ layer forms the excretory organs?

Answer 23

Mesoderm

Question 24

What germ layer forms the glands opening into the GI tract?

Answer 24

Endoderm

Question 25

What germ layer forms the glandular cells of the liver and pancreas?

Answer 25

Endoderm

Question 26

What germ layer forms the GI tract lining?

Answer 26

Endoderm

Question 27

What germ layer forms the reproductive organs?

Answer 27

Mesoderm

Question 28

What germ layer forms the retina of the eye?

Answer 28

Ectoderm

Question 29

What germ layer forms the skeleton?

Answer 29

Mesoderm

Question 30

What germ layer forms the striated muscle?

Answer 30

Mesoderm

Question 31

What germ layer forms the vessels?

Answer 31

Mesoderm

Question 32

The embryonic foramen oval becomes what structure after birth?

Answer 32

Fossa ovalis

Question 33

The embryonic ductus arteriosus becomes what structure after birth?

Answer 33

ligamentum arteriosum

Question 34

The embryonic ductus venous becomes what structure after birth?

Answer 34

ligamentum venousum

Question 35

The embryonic umbilical vein becomes what after birth?

Answer 35

ligamentum teres

Question 36

The embryonic umbilical arteries become what after birth?

Answer 36

Umbilical ligaments

Question 37

What fetal organs are developed at 4 weeks gestation?

Answer 37

heart, forebrain, upper and lower limbs, ears, lens of the eye

Question 38

At what stage does the external auditory canal develop?

Answer 38

6 weeks

Question 39

At what stage do the digits and external genitalia develop?

Answer 39

8 weeks

Question 40

At what stage do the intestines develop?

Answer 40

7 weeks

Question 41

At what stage does the ossification of bone begin?

Answer 41

7 weeks

Question 42

Describe the schema for fetal circulation

Answer 42

Oxygenated blood from placenta via umbilical vein bypasses liver through the ductus venous into IVC and right atrium, Through foramen oval to the left atrium and left ventricle or, directly into right ventricle to pulmonary trunk to ductus arteriosus, lungs or aorta, from aorta to upper and lower body