Prenatal Development Test #1

Front 1

Back 1

Frog, early cleavage
 Solid ball of cells

Front 2

Back 2

Frog, late cleavage
 Solid ball of cells with possible cavity (space) beginning to form

Front 3

Back 3

Frog, blastula
 Inner cell mass
 Trophoblast layer
 Blastoceole

Front 4

Back 4

Model/Embryo, fertilization
 Ovum
 Sperm
 Zona pellucida/corona radiata

Front 5

Back 5

Model/Embryo, zygote
 Zygote
 Zona pellucida/corona radiate
 Note cleavage/mitotic divisions

Front 6

Back 6

Model/Embryo, morula
 Morula
 Zona pellucida/corona radiate

Front 7

Back 7

Embryo stages
 Be able to identity each stage of the preimplanation period

Front 8

Back 8

Model/Embryo, blastocyst
 Inner cell mass
 Trophoblast layer
 Blastoceole (cavity)

Front 9

Back 9

Model/Embryo, implantation
 Note blastocyst has hatched from zona pellucida
 Imbedding into endometrium of the uterus
 Trophoblast cells will contribute to the placenta

Front 10

Back 10

Chick, 20-22 hrs
 Neural groove

Front 11

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Back 11

Chick, 33 hrs.
 Neural groove
 Somites
 Cephalic end
 Caudal end

Front 12

Back 12

Chick, 33 hrs.
 Neural groove
 Somites
 Cephalic end
 Caudal end

Front 13

Back 13

Chick, 40-43 hrs
 Tubular form of embryo
 Cephalic end
 Caudal end
 Somites

Front 14

Back 14

Chick, 40-43 hrs
 Tubular form of embryo
 Cephalic end
 Caudal end
 Somites

Front 15

Back 15

1. Embyro(s) 13-17days:
 Amniotic cavity
 Epiblast
 Hypoblast
 Yolk sac
 Note that embryo is now the ‘bilaminar embryonic disc’

Front 16

Back 16

2. Embyro(s) 28days:
 Trilaminar embryonic disc (gastrulation has occurred)
 Primitive streak
 Cranial region
 Caudal region

Front 17

Back 17

3. Embyro(s) 32days:
 Pharyngeal arches
 BA1, BA2
 Cranial/cephalic end
 Caudal end
 Somites
 Heart
 Otic placodes

Front 18

Back 18

4. Embyro(s) 33days:
 Pharyngeal arches
 BA1, BA2
 Cranial/cephalic end
 Caudal end
 Heart
 Otic placode
 Lens placode
 Lateral nasal process (LNP)
 Limb buds
 Somites
 Primitive gut
 Note: size of 4th week embryo within amniotic sac