Repro System Embryology 1

Question 1

What days on the menstrual cycle form the menstrual phase?

Answer 1

Days 1 to 4

Question 2

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

Answer 2

Days 15 to 28

Question 3

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

Answer 3

Days 4 to 14

Question 4

What hormone is released to promoste the development of the follicle?

Answer 4

FSH

Question 5

What causes a surge in LH?

Answer 5

Estrogen

Question 6

What is the zygote?

Answer 6

Diploid cells resulting from union of sperm and ovum

Question 7

What structure consists of 12 to 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 (but can range up to 12 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 the reproductive organs?

Answer 15

Mesoderm

Question 16

What fetal organs are developed at 4 weeks gestation?

Answer 16

Heart

Forebrain

Upper and lower limbs

Ears

Lens of the eye

Question 17

At what stage does the external auditory canal develop?

Answer 17

6 weeks (up to week 18),

Question 18

At what stage do the external genitalia develop?

Answer 18

8 weeks. By week 12, male and female external genitalia are distinguished.

Question 19

At what stage do the intestines develop?

Answer 19

Week 7

Question 20

At what stage does the ossification of bone begin?

Answer 20

Week 7

Question 21

True or False: Fibrocartilage forms the temporary fetal skeleton, which eventually is replaced by bone.

Answer 21

False, it is Hyaline cartilage

Question 22

Describe the schema for fetal circulation.

Answer 22

Oxygenated blood from placenta via umbilical vein; through ductus venosus (bypasses the liver), into IVC and right atrium; through foramen ovale to left atrium and left ventricle, or into right ventricle to pulmonary trunk to ductus arteriosus (bypasses lungs); from aorta to internal iliac and umbilical arteries, to the capillaries in the chorionic villi of the placenta.