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Embryology > 3rd Week of Development > Flashcards

3rd Week of Development Flashcards

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1
Q

Gastrulation

A

Formation of Germ layers

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2
Q

Neurulation

A

Formation of neural tube

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3
Q

When does gastrulation and neurulation occurs

A

3rd week of development

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4
Q

Sequence of formation of Gastrulation

A

Cranio - caudal sequence.

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5
Q

Hypoblast cells are _____ shaped

A

Cuboidal

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6
Q

Epiblast cells are ____ shaped

A

Columnar

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7
Q

Prochordal plate are _____ cells of Hypoblast

A

Columnar

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8
Q

Prochordal plate gives rise to

A

Buccopharyngeal membrane

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9
Q

Oral cavity is derived from

A

Buccopharyngeal membrane

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10
Q

Buccopharyngeal membrane is derived from

A

Prochordal plate

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11
Q

Prochordal plate ____ end

A

Cranial

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12
Q

Primitive streak ___ end

A

Tail

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13
Q

Primitive streak is derived from

A

Epiblast.

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14
Q

When does primitive streak form

A

end of 2nd week or beginning of 3rd week

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15
Q

What indicates the start of gastrulation

A

Primitive streak formation.

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16
Q

Persistence of primitive streak causes

A

Sacrococcygeal teratoma

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17
Q

1st germ layer to be formed

A

Endoderm

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18
Q

Endoderm replaces

A

Hypoblast

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19
Q

2nd germ layer to be formed

A

mesoderm

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20
Q

Prochordal plate and cloacal membrane formed from

A

ecto and endoderm

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21
Q

3rd germ layer to develop

A

Ectoderm

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22
Q

remains of epiblast after formation of intraembryonic mesoderm gives rise to

A

Ectoderm

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23
Q

4th germ layer to be formed

A

NCC, secondary mesenchyme

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24
Q

All germ layers are derived from

A

Epiblast > yolk sac

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25
Notochord formation steps
Hensen's node - primitive pit / blastopore - Notochordal process -Formation of Notochordal plate - Notochord formation.
26
primitive streak - midline mesoderm forms
Notochord
27
Role of Notochord
Stimulates formation of Neural tube from ectoderm
28
Remnants of notochord
Nucleus pulposus > Apical lig of dens
29
Persistence of notochord -
Chordoma
30
Pathognomic of Chordoma
Physaliferous cell - vacuolated cytoplasm and peripheral nucleus.
31
Parts of intraembryonic mesoderm
Paraxial Intermediate Lateral mesoderm
32
Undivided part of lateral mesoderm
Septum Transversum
33
Septum transversum - location
Cranial to prochordal plate
34
Septum Transversum gives rise to
Diaphragm , Liver - Connective tissue, Kupffer cells, Sinusoids. Fibrous pericardium.
35
Paraxial mesoderm gives rise to
Somites
36
Intermediate mesoderm gives rise to
Urogenital system
37
Lateral mesoderm - parts
somatic and Splanchnopleuric layer
38
Somatic layer of Intraembryonic lateral mesoderm gives rise to
Appendicular skeleton and somatic layer of body cavity
39
Splanchnopleuric layer of intraembryonic mesoderm gives rise to
Cardiac and smooth muscles and Visceral layer of body cavity.
40
1st pair of somites - when and where
D20 - Occipital region.
41
Rate of growth of somites -
3 pairs / day
42
after 5th week - how many somites
35
43
From which regions does somites disappear
Occipital and Coccygeal
44
Parts of Somites
Sclerotome and Dermomyotome
45
Sclerotome - parts
Lateral, Ventral, Dorsal.
46
Dorsal sclerotome - derivatives
Vertebral spine.
47
Lateral sclerotome - derivatives
Vertebral arch
48
Ventral sclerotome - Derivatives
Vertebral body
49
Axial skeleton is derived from -
Somites
50
Appendicular skeleton is derived from -
Somatic layer of Intraembryonic mesoderm
51
NC and NT are surrounded by
Sclerotome
52
Failure of fusion of Ventral sclerotome
Hemivertebra
53
Failure of fusion of Dorsal sclerotome
Spina bifida
54
Parts of dermomyotome
Dermatome and Myotome
55
Dermatome derivatives
Dermis of skin
56
Myotome derivatives
Skeletal muscles.
57
UL bones derived from .? | UL muscles derived from
Somatic IE mesoderm | Myotome of Somties.
58
tuft of hair seen in which deformity
Spina Bifida occulta.
59
Smooth muscle over dorsal aorta developed from
Splanchnopleuric layer of lateral mesoderm.
60
Smooth muscle over Pharyngeal arch arteries derived from
NCC
61
Smooth muscle of Iris derived from
Neuroectoderm.
62
Smooth muscle of sweat glands and mammary glands derived from
Surface ectoderm.
63
Tertiary villi is formed by
Blood vessels formed by Splanchnopleuric EEM + somatic layer of EEM + Syncytiotrophoblast + Cytotrophoblast.
64
Blood Vessels are derived from
Mesodermal layers.
65
Blood vessels formation - Sequence
``` EEM layer - BV then IEM layers - BV then Anastomosis. ```
66
Angioma
tumour of blood vessels - Origin - Mesodermal
67
Origin of Angioma
Mesodermal
68
Hematopoiesis upto 5th week is carried out by
Splanchnopleuric layer of EEM
69
From 5 th week Hematopoiesis is carried out by
Liver, Spleen, Thymus and Bone marrow.
70
Liver - Hematopoiesis timeline
5th week to 7th month.
71
Maternal component of placenta is formed by
Decidua Basalis
72
Fetal component of Placenta is formed by
Chorionic villi.

Embryology (16 decks)

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