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ANATOMY Q1 > Embryonic Period 3-8 Weeks > Flashcards

Embryonic Period 3-8 Weeks Flashcards

1
Q

Teeth enamel is derived from what germ layer

A

Ectoderm

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2
Q

Forelimbs paddle-shaped;
Nasal pits formed;
Embryo tightly C-shaped

A

Day 31-35

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3
Q

Parathyroid derived from what germ layer

A

Endoderm

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4
Q

Develops from somites

A

Bone, cartilage, muscle, dermis of the skin

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5
Q

Central nervous system is derived from what germ layer

A

Ectoderm

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6
Q

Sensory epithelium (ear, nose, eye) is derived from what germ layer

A

Ectoderm

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7
Q

Dermatome (tissue)

A

Dermis of the skin

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8
Q

Embryonic period (day 24-25) number of somites

A

13-20 somites

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9
Q

Respiratory tract epithelial lining derived from what germ layer

A

Endoderm

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10
Q

Embryonic epiblast produces what

A

Primitive streak
Ectoderm

Mesoderm
Primordial germ cells

Endoderm

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11
Q

Fourth visceral arch formed;
Hind limb buds appear;
Otic vesicle and lens placode

A

Day 28-30

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12
Q

GI tract epithelial lining derived from what germ layer

A

Endoderm

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13
Q

Embryonic period (day 28-30) number of somites

A

30-35 somites

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14
Q

Digital rays in hand and foot plates;
Brain vesicles prominent;
External auricle forms from auricular hillocks;
Umbilical herniation intiated

A

Day 36-42

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15
Q

Number of somites that appear during Day 20-21

A

1-4

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16
Q

Auditory tube epithelial lining derived from

A

Endoderm

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17
Q

Pancreas derived from what germ layer

A

Endoderm

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18
Q

Day(s) the notochordal process appears

A

Day 16-18

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19
Q

Tympanic cavity epithelial lining derived from

A

Endoderm

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20
Q

Embryonic period (day 20-21) number of somites

A

1-4 somites

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21
Q

Embryonic period (day 26-27) number of somites

A

21-29 somites

22
Q

Connection with yolk sac and placenta maintained through

A

Vitelline duct and umbilical cord, respectively

23
Q

Skin, hair, nails is derived from what germ layer

A

Ectoderm

24
Q

Liver derived from germ layer

A

Endoderm

25
Q 
Limbs long, bent at elbows, knees;
Fingers, toes, free;
Face more human like;
Tail disappears;
Umbilical herniation persists until the end of the third month
A

Day 50-56

26
Q

Somites appear

A

Day 20-21

27
Q

Embryonic period (day 22-23) number of somites

A

5-12 somites

28
Q

Intraemryonic mesoderm spread under cranial ectoderm;
primitive streak continues;
umbilical vessels and cranial neural folds begin to form

A

Day 19-20

29
Q

Notochordal process appears;

hemopoietic cells in yolk sac develop

A

Day 16-18

30
Q

Somitomeres are formed from

A

Paraxial mesoderm

31
Q

Day(s) the primitive streak appears

A

Day 14-15

32
Q

Connective tissue and bones of the face and skull derived from

A

Neural crest (ectoderm)

33
Q

Caudal neuropore closing or closed;
Upper limb buds appear;
Three pairs of visceral arches

A

Day 26-27

34
Q

Cephalocaudal folding under way;
cranial neuropore closing or closed;
optic vesicles formed;
otic placodes appear

A

Day 24-25

35
Q

Pituitary gland derived from what germ layer

A

Ectoderm

neural tube (posterior pituitary) / outer epithelium (anterior pituitary)

36
Q

Mammary and sweat glands are derived from what germ layer

A

Ectoderm

37
Q

Three components of the mesodermal germ layer

A

Paraxial, intermediate, lateral plate

38
Q

Three supporting tissues produced by somites (paraxial mesoderm)

A

Myotomes
Sclerotomes
Dermatomes

39
Q

Cranial neural folds elevated and deep neural groove established; embryo begins to bend

A

Day 20-21

40
Q

Myotome (tissue)

A

Muscle tissue

41
Q

Neural tube failure (cranial region)

A

Anencephaly

42
Q

Part of pituitary gland is derived from the neural tube of the ectoderm

A

Posterior pituitary

43
Q

Fusion of neural folds begins in cervical region;
cranial and caudal neural folds open widely;
visceral arches 1 and 2 present;
heart tube begins to fold

A

Day 22-23

44
Q

Urinary bladder epithelial lining derived from what germ layer

A

Endoderm

45
Q

Mesenchyme of the head derived from

A

Somitomeres (paraxial mesoderm)

46
Q

Parenchyma of the thyroid derived from what germ layer

A

Endoderm

47
Q 
Pigmentation of retina visible;
Digital rays separate;
Nipples and eyelids formed;
Maxillary swellings fuse with medial nasal swellings as upper lip forms;
Prominent umbilical herniation
A

Day 43-49

48
Q

Neural tube fails to close (cervical region caudally)

A

Spina bifida

49
Q

Sclerotome (tissue)

A

Cartilage and bone

50
Q

Peripheral nervous system is derived from what germ layer

A

Ectoderm

ANATOMY Q1 (14 decks)

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