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EMBRYOLOGY > NEURULATION > Flashcards

NEURULATION Flashcards

1
Q

It is the result of thickening of the surface ectodermal cells

A

NEURAL PLATE

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2
Q

When neural plate bwcomes depressed it forms?

A

NEURAL GROOVE

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3
Q

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

A

NEURAL FOLDS

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4
Q

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

A

NEURAL TUBE w/ a NEURAL CANAL & NEUROEPITHELIUM

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4
Q

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

A

NEURAL TUBE w/ a NEURAL CANAL & NEUROEPITHELIUM

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5
Q

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??

A

NEURAL CREST CELLS

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6
Q

when neural crest cells migrate DORSALLY they become??

A

pigment of skin

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7
Q

when neural crest cells migrate VENTRALLY they become?

A

NEURONS OR GLIAL CELLS OR ADRENAL MEDULLA CELLS

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8
Q

and those in head region forms?

A

MESENCHYME (ectomesenchyme)

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9
Q

during head process, it occupies the??

A

Anterior border of future head

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10
Q

it is bounded by the crescentic head fold or??

A

subcephalic pocket

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11
Q

this space separates the head process from the embryonic disk?

A

SUBCEPHALIC SPACE

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12
Q

HEAD PROCESS IN CODES

A
  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
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13
Q

head process in humans occurs at what days of embryo?

A

18 DAYS

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14
Q

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

A

20-22 hours

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15
Q

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

A

Cephalic growth

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16
Q

2 succeding events in cephalic growth.

A
  1. formation of sucephalic pocket
  2. Lateral body folds
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17
Q

transveres-furrow is called

A

SUBCEPHALIC POCKET

18
Q

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

A

Lateral body folds

19
Q

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

A

FOREGUT

20
Q

most rostral tip entually becomes the?

A

PHARYNX

20
Q

most rostral tip entually becomes the?

A

PHARYNX

21
Q

foregut is formed when?

A

SUBCEPHALIC expands caudally beneath the head process

22
Q

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

A

LEFT AND RIGHT ENDODERMAL FOLDS

23
Q

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

A

HINDGUT

24
Q

These are blocks of mesoderm

A

SOMITES

25
Q

These are blocks of mesoderm

A

SOMITES

26
Q

somites is derived from?

A

PARAXIAL MEDOSERM

27
Q

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

A

20th hour

28
Q

by this hour the first pair of somite is completed

A

21st hour

29
Q

how many interval is given until the 4oth hour?

A

1 hour interval

30
Q

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

A

MESODERM

31
Q

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

A

MYOCOELE

32
Q

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

A

OCCIPTAL SOMITES

33
Q

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

A

SOMITOMERES

34
Q

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

A

72

35
Q

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

A

DERMATOME

36
Q

Skin epidermis, hair follicle and glands are derived from?

A

SURFACE ECTODERM

37
Q

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

A

MELANOCYTES & TACTILE DISC RECEPTORS

38
Q

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

A

SCLEROTOME

39
Q

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

A

Myotome

40
Q

cardiac tube originates from?

A

PAIRED PRIMORDIA in the mesoderm

41
Q

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

A

25 HOUR OF INCUBATION

EMBRYOLOGY (5 decks)

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