Embryo 3Rd Week

Front 1

Grastulation involves the formation of the ____, _____, and _____.

Back 1

notochord, germ layers, primitive streak

Front 2

On day ____ a thickened band of ____ cells appears caudally in the midline of the embryonic disk. This is called ____.

Back 2

15, epiblasts, primitive streak

Front 3

The cranial end of the primitive streak is called the _____.

Back 3

primitive knot (Hansens Node)

Front 4

Cells that multiply in the epiblast and migrate toward the primitive streak and then migrate through the groove are called _____.

Back 4

mesoderm

Front 5

Mesoderm that form a layer between the epiblast and the hypoblast are called _______.

Back 5

intraembryonic mesoderm

Front 6

By the ___ week the primitive streak diminishes in size and becomes an insignificant structure in the _____ region.

Back 6

4th, sacrococcygeal

Front 7

Mesodermal cells migrate between the epiblast and hypoblasts in all regions, except the ____ and ____, which are ____ in origin.

Back 7

prochordal, cloacal, endoderm

Front 8

The prochordal plate is the furture site of the ____, and the cloacal plate is the future site of the ____.

Back 8

mouth, anus

Front 9

The prochordal plate and cloacal plate fuse with _____ to form the _____ and _____.

Back 9

ectodermal cells, oropharyngeal membrane, cloacal membrane

Front 10

The _____ mesoderm covers the yolk sac and amnion.

Back 10

extraembryonic

Front 11

Mesoderm that migrates around the prochordal plate form the ____ area.

Back 11

cardiogenic

Front 12

Mesodermal cells migrating from the primitive knot to the prochordal plate form the ____.

Back 12

notochord

Front 13

The ____ induces neural tube formation.

Back 13

notochord

Front 14

The ____ is the structure around which the vertebral column forms.

Back 14

notochord

Front 15

The notochord degenerates and exists as the ____.

Back 15

nucleus pulposus

Front 16

The ____ is associated with early blood formation and in formation of the urinary bladder.

Back 16

allantosis (Day 16)

Front 17

The blood vessels of the allantosis become the ____.

Back 17

umbilical veins and arteries

Front 18

Neurulation is the process involved in the formation of the ____, ____ and their closure to form the ____.

Back 18

neural folds, neural plate, neural tube

Front 19

Neurulation is completed by the end of the ___ week when the ___ closes.

Back 19

4th, caudal end of the neuropore

Front 20

The ____ overlying the notochord form the _____ plate.

Back 20

ectoderm, neural

Front 21

The ectoderm of the neural plate is called _____ and will give rise to the _____.

Back 21

neuroectoderm, CNS

Front 22

The surface ectoderm of the neural tube form the ____, ____, and ____, with the remaining surface ectoderm forming the ___.

Back 22

lens, optic, nasal placodes, epidermis

Front 23

The neural plate invaginates forming the ___ with 2 _____.

Back 23

neural groove, neural folds

Front 24

The neural folds fuse converting the ____ into a ____.

Back 24

neural plate, neural tube( closes day 26)

Front 25

____ cells resting along the crest of each neural fold seperate and form the _____.

Back 25

Neuroectoderm, neural crest cells

Front 26

Neural crest cells migrate and give rise to the ____ of the spinal and cranial nerves.

Back 26

sensory ganglia

Front 27

The CNS arises from the _____.

Back 27

ectoderm

Front 28

The PNS arises from the _____.

Back 28

ectoderm

Front 29

The sensory epithelium of the sensory organs arise from ___.

Back 29

ectoderm

Front 30

The epidermis, including hair, nails, cutaneous and mammary glands arise from _____.

Back 30

ectoderm

Front 31

The anterior pituitary gland arises from ____.

Back 31

ectoderm

Front 32

The enamel of the teeth arise from the ____.

Back 32

ectoderm

Front 33

Derivatives of the neural crest give arise from the ____.

Back 33

ectoderm

Front 34

The ____ proliferates and condenses to form 2 colums of paraxial mesoderm.

Back 34

intraembryonic mesoderm

Front 35

The ____ mesoderm thins out lateraly into a layer of ____ mesoderm.

Back 35

intermediate, lateral

Front 36

The ____ mesoderm differentiates into blocks of mesodermal tissure called somites by the end of the 3rd week.

Back 36

paraxial

Front 37

The paraxial mesoderm differentiates into blocks of mesodermal tissure called ____ by the end of the 3rd week.

Back 37

somites

Front 38

Dermatomes form ____.

Back 38

dermis

Front 39

Myotomes form _____.

Back 39

muscle cells

Front 40

Sclerotomes form _____.

Back 40

vertebrae and ribs

Front 41

The ____ mesoderm form the kidneys and gonads

Back 41

intermediate

Front 42

The lateral mesoderm seperates into 2 layers forming the ____.

Back 42

inraembryonic coelom

Front 43

The ___ layer is continuous with the extraembryonic mesoderm surrounding the amnion, while the ____ layer is continuous with the extraembryonic mesoderm surrounding the yolk sac.

Back 43

somatic or parietal, visceral or splanchnich

Front 44

The somatopleura or embryonic body wall is formed from the ____ and ____.

Back 44

somatic mesoderm, overlying ectoderm

Front 45

The embryonic gut wall or splanchnopleura is formed from the ____ and _____.

Back 45

splanchnic mesoderm, endoderm

Front 46

The intraembryonic coelom divides into the ____, _____, and ____.

Back 46

pleural, pericardial, peritoneal cavities

Front 47

Blood vessels form only in ___ tissue.

Back 47

mesoderm

Front 48

Connective tissue, cartilage and bone except in the head and neck arise from _____.

Back 48

mesoderm

Front 49

Striated, smooth and cardiac muscle arise from the ____.

Back 49

mesoderm

Front 50

Blood cells, wall of the heart, blood and lymph vessels arise from the ____.

Back 50

mesoderm

Front 51

Kidney arise from the _____.

Back 51

intermediate mesoderm

Front 52

Gonads and their ducts arise from the ____.

Back 52

mesoderm

Front 53

Cortex of the adrenal glands arise from the ____.

Back 53

mesoderm

Front 54

The spleen arises from the ____.

Back 54

mesoderm

Front 55

The septum transversium gives rise to part of the ____.

Back 55

diaphragm ( mesodermal)

Front 56

A portion of the yolk sac is enclosed within the embryo forming the ____.

Back 56

foregut

Front 57

The allantosis, an outpouching of the ____ is folded under the embryo forming the ____.

Back 57

endoderm, forgut

Front 58

The epithelial lining of the primitive gut and intraembryonic portions of the alantosis and yolk sac arise from the ____.

Back 58

endoderm

Front 59

The epithelial lining of the respiratory tract arise from the ____.

Back 59

endoderm

Front 60

The parenchyma of the tonsils and thyroid gland arise from the ____.

Back 60

endoderm

Front 61

The parathyroid gland arises from the ___.

Back 61

endoderm

Front 62

Thymus, liver and pancreas arise from the ____.

Back 62

endoderm

Front 63

The epithelial lining of the urinary bladder arises from the ____.

Back 63

endoderm

Front 64

The urethra arises from the ____.

Back 64

endoderm

Front 65

The epithelial lining of the tympanic cavity and auditory tube arise from the ___.

Back 65

endoderm

Front 66

The epithelium and glands of the gut arise from the ___.

Back 66

endoderm

Front 67

___ is vessels arising from blood islands.

Back 67

Vasculogenesis

Front 68

___ is new vessels arising from exisiting vessels.

Back 68

angiogenesis

Front 69

Blood islands plus FGF2 produce _____.

Back 69

hemangioblasts

Front 70

Hemangioblasts with VEGF cause _____.

Back 70

tube formation