NEURULATION

Question 1

It is the result of thickening of the surface ectodermal cells

Answer 1

NEURAL PLATE

Question 2

When neural plate bwcomes depressed it forms?

Answer 2

NEURAL GROOVE

Question 3

and the edges of the neural plates becomes raised or elevated to form the?

Answer 3

NEURAL FOLDS

Question 4

neural plate converge and fuse dorsally to form the? with a?

Answer 4

NEURAL TUBE w/ a NEURAL CANAL & NEUROEPITHELIUM

Question 4

neural plate converge and fuse dorsally to form the? with a?

Answer 4

NEURAL TUBE w/ a NEURAL CANAL & NEUROEPITHELIUM

Question 5

Bilaterally, where the neural groove is joined to non-neural ectoderm, neural ectodermal cells detach as the neural fold FUSE, PROLIFERATE & ASSUME a position dorsolaterally to the neural tube to form the??

Answer 5

NEURAL CREST CELLS

Question 6

when neural crest cells migrate DORSALLY they become??

Answer 6

pigment of skin

Question 7

when neural crest cells migrate VENTRALLY they become?

Answer 7

NEURONS OR GLIAL CELLS OR ADRENAL MEDULLA CELLS

Question 8

and those in head region forms?

Answer 8

MESENCHYME (ectomesenchyme)

Question 9

during head process, it occupies the??

Answer 9

Anterior border of future head

Question 10

it is bounded by the crescentic head fold or??

Answer 10

subcephalic pocket

Question 11

this space separates the head process from the embryonic disk?

Answer 11

SUBCEPHALIC SPACE

Question 12

HEAD PROCESS IN CODES

Answer 12

1. Occupies the A.B of future head
2. BOUNDED by the sucephalic pocket
3. SUBCEPHALIC SPACE separates the head process
4. cylindrical head process ELONGATES
5. elongation INCORPORATES the most anterior half dozen somites into the future head

Question 13

head process in humans occurs at what days of embryo?

Answer 13

18 DAYS

Question 14

head process in chick embryo occurs at how many hours of incubation?

Answer 14

20-22 hours

Question 15

it;s the beginning of the formation of the definitive embryonic body.

Answer 15

Cephalic growth

Question 16

2 succeding events in cephalic growth.

Answer 16

1. formation of sucephalic pocket
2. Lateral body folds

Question 17

transveres-furrow is called

Answer 17

SUBCEPHALIC POCKET

Question 18

lateral-furrow on both side of head process is called?

Answer 18

Lateral body folds

Question 19

the first part of the gut tube that is formed is the?

Answer 19

FOREGUT

Question 20

most rostral tip entually becomes the?

Answer 20

PHARYNX

Question 20

most rostral tip entually becomes the?

Answer 20

PHARYNX

Question 21

foregut is formed when?

Answer 21

SUBCEPHALIC expands caudally beneath the head process

Question 22

when these 2 meets in the ventral & midline & and then fuse forming the floor of the foregut.

Answer 22

LEFT AND RIGHT ENDODERMAL FOLDS

Question 23

When folding continues caudally to the level of the umblicus & later a new endodermal enfolding starts at the tail region to form the?

Answer 23

HINDGUT

Question 24

These are blocks of mesoderm

Answer 24

SOMITES

Question 25

These are blocks of mesoderm

Answer 25

SOMITES

Question 26

somites is derived from?

Answer 26

PARAXIAL MEDOSERM

Question 27

somites formation starts at the middle of the 1/3 embryonic disk during?

Answer 27

20th hour

Question 28

by this hour the first pair of somite is completed

Answer 28

21st hour

Question 29

how many interval is given until the 4oth hour?

Answer 29

1 hour interval

Question 30

it accumulates on each side of the notochord and is designated as paraxial mesoderm?

Answer 30

MESODERM

Question 31

Cells of paraxial mesodeem becomes COMPACT and ARRANGED radially round a tiny cavity called ?

Answer 31

MYOCOELE

Question 32

from PROLIFERATION of local mesenchyme laterl=al to cranial end of the notochord developed the ?

Answer 32

OCCIPTAL SOMITES

Question 33

Rostral to the notochord, mesenchyme forms less-developed somites called?

Answer 33

SOMITOMERES

Question 34

at about this hours of incubation in chick embryo the 36 pairs of somites is complete

Answer 34

72

Question 35

this is lateral regions of somites, that migrate to form the skin dermis ?

Answer 35

DERMATOME

Question 36

Skin epidermis, hair follicle and glands are derived from?

Answer 36

SURFACE ECTODERM

Question 37

when neural crest cell migrate into the epidermis it becomes the?

Answer 37

MELANOCYTES & TACTILE DISC RECEPTORS

Question 38

this is the medial region of somites that forms the most of AXIAL SKELETON

Answer 38

SCLEROTOME

Question 39

this is the middle region of somites that forms the skeletal musculature?

Answer 39

Myotome

Question 40

cardiac tube originates from?

Answer 40

PAIRED PRIMORDIA in the mesoderm

Question 41

at this hour of incubation, Mesenchymal cells in the cardiogenic plate MIGRATE between the lateral ENDODERM and CARDIOGENIC PLATE and form several SMALL ENDOCARDIAL VESICLES that eventually COALESCE

Answer 41

25 HOUR OF INCUBATION