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HISTOLOGY > MODULE 1 : EMBRYONIC PERIOD > Flashcards

MODULE 1 : EMBRYONIC PERIOD Flashcards

0
Q

Basis of Pregnancy Test. Secretion begins as early as 8 days postovulation.

A

HUMAN CHORIONIC GONADOTROPHIN

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1
Q
  • continuous multinucleate layer of protoplasm

- secretes lactogen, estrogen, progesterone, HCG

A

SYNCITIOTROPHOBLAST

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2
Q

Composed of :

  • extraembreyonic mesoderm
  • cytotrophoblast
  • syncitiotrophoblast
A

CHORION

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3
Q

Site of origin of primordial germ cells

A

YOLK SAC

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4
Q

Thickened circular area in the hypoblast

A

PRECHORDAL PLATE

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5
Q

Future site of mouth

A

OROPHARYNGEAL MEMBRANE

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6
Q

Future site of Anus

A

CLOACAL MEMBRANE

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7
Q

Process by which three germ layers are established

A

GASTRULATION

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8
Q

First sign of Gastrulation

A

FORMATION OF PRIMITIVE STREAK

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9
Q

Thickening of the medial plane of the epiblast starting at the caudal end

A

PRIMITIVE STREAK

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10
Q

Cranial end of streak proliferates to form what?

A

PRIMITIVE NODE

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11
Q

A disease wherein there is a remnant of the primitive streak

A

SACROCOCCYGEAL TETRATOMA

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12
Q

Forms the epidermis of skin, L.E. of mouth and rectum, cornea and lens of eye

A

ECTODERM

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13
Q

Forms the notochord, skeletal, muscular, excretory, circulatory and lymphatic systems, dermis of skin

A

MESODERM

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14
Q

L.E. of digestive tract, respiratory system, urethra, UB, reproductive system

A

ENDODERM

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15
Q

A cellular rod that develops from the notochordal process

A

NOTOCHORD

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16
Q

Indicates future site of vertebral bodies

A

NOTOCHORD

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17
Q

Small out-pouching from the caudal wall of the yolk sac which functions for :

  • respiration
  • urine reservoir
  • assoc. with the development of UB
A

ALLANTOIS

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18
Q

Thickening of the embryonic ectoderm overlying the notochord

A

NEURAL PLATE

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19
Q

Infolding of the neural plate

A

Formation of NEURAL TUBE

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20
Q

Primordium of the CNS

A

NEURAL TUBE

21
Q

Formation of the Neural Tube

A

NEURULATION

22
Q

Differentiates and begins to divide into paired cuboidal bodies and gives rise to axial skeleton and skeletal muscles

A

PARAXIAL MESODERM

23
Q

Gives rise to genitourinary system

A

INTERMEDIATE MESODERM

24
Q

Gives rise to intraembryonic coelom

A

LATERAL PLATE MESODERM

25
Q

Gives rise to the axial skeleton and its associated musculature

A

SOMITES

26
Q

First organ to reach a functional state

A

CARDIOVASCULAR SYSTEM

Heart begins to beat during 3rd-4th week

27
Q

All major organs and systems of the body form from three germ layers

A

ORGANOGENETIC PERIOD

28
Q

Occurs when there is a failure of progression of the body folding

A

BODY WALL DEFECTS

29
Q

Herniation of abdominal contents directly into the amniotic cavity

A

GASTROSCHISIS

30
Q

First hematopoietic organ, role in transfer of nutrients to embryo

A

YOLK SAC

31
Q

Persistence of yolk sac

A

ILEAL DIVERTICULUM (Meckel Diverticulum)

32
Q

A division of Primitive gut which extends from the oropharyngeal membrane to the liver outgrowth (supplied by Celiac Trunk)

A

FOREGUT

33
Q

Division of Primitive Gut which forms part of the liver outgrowth to the junction of the Right 2/3 and Left 1/3 of transverse colon (supplied by Superior Mesenteric)

A

MIDGUT

34
Q

A division of the Primitive Gut from the left third of the transverse colon on the cloacal membrane (supplied by inferior mesenteric)

A

HINDGUT

35
Q

Site of primordium of kidneys

A

MESONEPHRIC RIDGE

36
Q

EMBRYONIC PERIOD : appearance of mesonephric ridge

A

FIFTH WEEK

37
Q

EMBRYONIC PERIOD : formation of extremities (upper limbs develop first)

A

SIXTH WEEK

38
Q

Primordium of external auditory canal

A

AURICULAR HILLOCK

39
Q

EMBRYONIC PERIOD : Heart prominence

A

SIXTH WEEK

40
Q

EMBRYONIC PERIOD : development of auricular hillock

A

SIXTH WEEK

41
Q

EMBRYONIC PERIOD : ossification of bones of upper limbs

A

SEVENTH WEEK

42
Q

EMBRYONIC PERIOD : has distinct human characteristics but head is still half of embryo size

A

EIGHTH WEEK

43
Q

EMBRYONIC PERIOD : Start of development of external genetalia

A

EIGHTH WEEK

44
Q

EMBRYONIC PERIOD : formation of morula

A

FIRST WEEK

45
Q

EMBRYONIC PERIOD : start of implantation

A

FIRST WEEK

46
Q

EMBRYONIC PERIOD : embryoblast forms two layers

A

SECOND WEEK

47
Q

EMBRYONIC PERIOD : formation of primary yolk sac

A

SECOND WEEK

48
Q

EMBRYONIC PERIOD : formation of Chorionic Cavity

A

SECOND WEEK

49
Q

EMBRYONIC PERIOD : Gastrulation

A

THIRD WEEK

50
Q

EMBRYONIC PERIOD : Neurulation

A

THIRD WEEK

51
Q

EMBRYONIC PERIOD : formation of three germ layers

A

THIRD WEEK

HISTOLOGY (7 decks)

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