Embryonic Period

Question 1

Period of “organogenesis” - development of?

Answer 1

Period of “organogenesis” - development of
ORGANS

Question 2

Embryonic period Occurs from___ to __ weeks of pregnancy

Answer 2

3rd to 8th

Question 3

T or F
by the end of the embryonic period the main organs are established, rendering the features of the external body

Answer 3

TRUE

Question 4

What day?
your neural tube will have the neural plate, and the depression at the center is the neural groove

Answer 4

By the 19th day

Question 5

What day?
There is a formation of neural folds, that will continue to rise until they fuse

Answer 5

Day 22

Question 6

What day?
the heart begins to beat, ___week of development.

Answer 6

the heart begins to beat, 4th week of development.
Day 24-28

Question 7

T or F
The venous system is ready to supply nutrients and oxygen by the 50th day only

Answer 7

FALSE
The venous system is ready to supply nutrients
and oxygen by day 24-28

Question 8

The cranial neuropore will close at Day ?

Answer 8

The cranial neuropore will close at Day 25

Question 9

The caudal neuropore closes by Day ?

Answer 9

The caudal neuropore closes by Day 28

Question 10

Process whereby neural plate is transformed to neural tube

Answer 10

Neurulation

Question 11

T or F
At the 2nd week, the lateral edges form a neural
fold that gradually fuse at the midline to form the
neural tube

Answer 11

FALSE
At the 3rd week, the lateral edges form a neural
fold that gradually fuse at the midline to form the
neural tube

Question 12

T or F
Fusion begins cranially and caudally - shoulder to legs
Neural Tube forms as a result

Answer 12

FALSE
Fusion begins cranially and caudally - head to
legs
Neural Tube forms as a result

Question 13

Structures formed from ectodermal layer

Answer 13

CNS
➢ PNS
➢ Epidermis
➢ Enamel of teeth
➢ Mammary Glands
➢ Pituitary Glands

Question 14

During the ___day, your cells will proliferate your
midline forming your paraxial mesoderm

Answer 14

During the 17th day, your cells will proliferate your
midline forming your paraxial mesoderm

Question 14

The mesoderm layer remains thin laterally forming the ___Plate
In your paraxial, we have your head and somites

Answer 14

Mesoderm layer remains thin laterally forming the
Lateral Plate
In your paraxial, we have your head and somites

Question 15

T or F
Paraxial Mesoderm forms somitomeres to somites which will give
rise to the

Answer 15

TRUE

Question 16

muscle tissue supplied by one nerve

Answer 16

Myotome

Question 17

cartilage and bone supplied by one nerve

Answer 17

Sclerotome

Question 18

dermis of the skin supplied by one nerve

Answer 18

Dermatome

Question 19

Forms excretory units of the urinary system and
the gonads develop from this segment

Answer 19

Intermediate Mesoderm

Question 20

Forms the kidney and gonads, testes and ovaries

Answer 20

Intermediate Mesoderm

Question 21

two layers of the lateral mesoderm, what is inner what is outer?

Answer 21

Parietal Layer - outer layer
Visceral Layer - inner layer

Question 22

What forms the git tube

Answer 22

Visceral Layer - inner layer

Question 23

Forms dermis of skin body wall and limbs, the bones, and connective tissue of limbs
▪ Forms the lateral body wall folds
▪ Forms the parietal layer of serous membrane

Answer 23

Parietal Layer - outer layer

Question 24

Space between the parietal and visceral layer of the lateral plate mesoderm

Answer 24

Body Cavity

Question 25

• divides it into thoracic and peritoneal
  cavities for your thorax and abdominal organs

Answer 25

Diaphragm

Question 26

divides into pericardial cavity and two pleural cavities

Answer 26

Thoracic Cavity

Question 27

Structures formed from Mesodermal Layer

Answer 27

Vascular System - heart, arteries, veins
Urogenital System - kidneys, gonads, and their ducts
Spleen
Suprarenal Glands

Question 28

Three Regions of the GUT tube

Answer 28

• foregut, midgut, hindgut

Question 29

Structures formed in the Endoderm

Answer 29

GIT - main organ formed
o Epithelial lining of the GIT, Respiratory tract, and Urinary Bladder
o Epithelial lining of tympanic cavity and auditory tube
o Parenchyma - thyroid, parathyroid, liver, pancreas

Question 30

Neural tube defect (NTD) due to failed closure of
cranial region
Brian failed to form properly
They have learning difficulties

Answer 30

Anencephaly

Question 31

Neural Tube Defect (NTD) due to failed closure
of caudal region
The most common site is the lumbosacral region

Answer 31

Spina Bifida

Question 32

An abnormality of migration of neural crest cells
into the pharyngeal arches can lead to improper
development of the parathyroid glands, thymus,
facial skeleton, heart, aorta, and pulmonary trunk

Answer 32

DiGeorge Syndrome or Catch22 Syndrome

Question 33

They are more likely to suffer from -
Hypocalcemia, Cleft Palate, Tetralogy of Fallot,
Recurrent Infection, Renal Problems, and
Learning Problems

Answer 33

DiGeorge Syndrome or Catch22 Syndrome

Question 34

Tetralogy of Fallot - you have a 4 defect, the
ventricular septal defect, pulmonary stenosis,
misplaced aorta, and right ventricular
hypertrophy. It is a domino effect

Answer 34

DiGeorge Syndrome or Catch22 Syndrome

Question 35

Occurs when body wall closure fails in the
abdominal region

Answer 35

. Gastroschisis

Question 36

Intestinal loops hemiate into the amniotic cavity
through the defect which usually lies to the right
of umbilicus

Answer 36

. Gastroschisis

Question 37

Peritoneal and pleural cavities are continuous along the posterior body wall
o This hernia allows abdominal visceral to enter pleural cavity, usually on left

Answer 37

Congenital Diaphragmatic Hernia

Question 38

Upper portion of the stomach are retained in the
thorax and the stomach is considered at the level of
diaphragm

Answer 38

Esophageal Hernia