Embryology

Question 0

A ball of cells

Answer 0

Morula

Question 1

First cell you make after fertilization

Answer 1

Zygote

Question 2

When morula reaches uterine cavity and fluid comes in, now called

Answer 2

Blastocyst

Question 3

Single layer of cells around blastocyst

Answer 3

Trophoblast

Question 4

Placenta made from

Answer 4

Trophoblast

Question 5

Embryo formed from

Answer 5

Inner cell mass

Question 6

2 layers of the embryonic disc

Answer 6

Epiblast

Hypoblast

Question 7

The primitive yolk sac is a specialized ..

Answer 7

Hypoblast

Question 8

The trilaminar embryonic disc is formed in what step?

Answer 8

Gastrulation

Question 9

The primitive streak is made from the

Answer 9

Epiblast

Question 10

3 layers of the trilaminar embryonic disc

Answer 10

Ectoderm
Mesoderm
Endoderm

Question 11

What are the first cells to migrate and migrate cranially from the primitive pit?

Answer 11

Prechordal plate

Question 12

Midline cord of cells

Answer 12

Notochord

Question 13

Mesoderm sections on both sides of notochord

Answer 13

Paraxial mesoderm
Intermediate mesoderm
Lateral plate mesoderm
Extraembryonic mesoderm

Question 14

What forms the mouth

Answer 14

Oropharyngeal / buccopharyngeal membrane

Question 15

What forms the anus

Answer 15

Cloacal membrane

Question 16

What’s the term for epiblast cells that stop migration too soon and caudal end doesn’t develop properly

Answer 16

Caudal dysgenesis

Question 17

Extreme caudal dysgenesis

Answer 17

Sirenomelia

Question 18

The primitive pit extends and forms

Answer 18

Notochordal plate

Question 19

What forms around the notochord

Answer 19

Vertebral column

Question 20

Only remnant of the notochord is

Answer 20

Nucleus pulposus

Question 21

Genes in what area determine embryo axes

Answer 21

Primitive node

Question 22

2 types of reversal of laterality sequences

Answer 22

Partial

Situs inversis

Question 23

Formation of neural tube is called

Answer 23

Neurulation

Question 24

The neural plate is formed from the

Answer 24

Ectoderm

Question 25

The neural plate invaginates, forming the

Answer 25

Neural tube

Question 26

Closure of what starts in the cervical area and extends

Answer 26

Neural tube

Question 27

Does the anterior or posterior neuropore close first

Answer 27

Anterior

Question 28

What turns into the CNS?

Answer 28

Neural tube

Question 29

What forms the PNS?

Answer 29

Neural crest

Question 30

What forms the adrenal medulla

Answer 30

Neural crest

Question 31

What forms the vertebrae

Answer 31

Mesoderm

Question 32

What forms the skin

Answer 32

Ectoderm

Question 33

What forms melanocytes

Answer 33

Neural crest

Question 34

Split spine is also called

Answer 34

Rachischisis

Question 35

Protrusion of meninges is called

Answer 35

Meningocele

Question 36

Protrusion of meninges and neural tissue

Answer 36

Encephalocele and myelomeningocele

Question 37

The paraxial mesoderm gives rise to

Answer 37

Somites

Question 38

The intermediate mesoderm gives rise to

Answer 38

Urogenital organs, ducts, glands

Question 39

4 somites

Answer 39

Sclerotome Epimere Hypomere Dermatome

Question 40

The sclerotome gives rise to

Answer 40

Bone forming cells of vertebrae and ribs

Question 41

The epimere gives rise to

Answer 41

Muscles, CT of back proper

Question 42

Hypomere gives rise to

Answer 42

Muscles, CT of body wall and extremities

Question 43

The lateral plate mesoderm segregates into

Answer 43

Somatic / parietal layer Splanchnic / visceral layer Intraembryonic cavity / coelom

Question 44

The coelom will form

Answer 44

Body cavities

Question 45

What induces differentiation for limb bud formation?

Answer 45

Thickening ectoderm to form apical ectodermal ridge

Question 46

Partial absence of limbs

Answer 46

Meromelia

Question 47

Irregular limbs

Answer 47

Phocomelia

Question 48

Shortened digits

Answer 48

Brachydactyly

Question 49

Fused digits

Answer 49

Syndactyly