Embryology Md1 Block2 Test Review Ppp Notes Week 3-8

Front 1

These three germ layers give rise to all the tissues and organs of the adult.

Back 1

Ectoderm =

Mesoderm =

Endoderm =

Hint 1

Front 2

►The primitive streak
Gives rise to

Back 2

Notochord

Front 3

Embryonic Period is characterized by:

Back 3

Formation and differentiation of three germ layers
↓
▪Appearance of primitive streak
↓
▪ Somite formation
↓
▪Development of notochord
↓
▪Neural tube and Neural crest formation
↓
▪Completion of chorionic villi formation

Front 4

Some mesenchyme forms mesoblast (undifferentiated mesoderm), which forms =

Back 4

the intraembryonic, or embryonic mesoderm

Front 5

Mesenchymal cells derived from the primitive streak migrate widely.
These pluripotential cells have the potential to proliferate and differentiate into diverse types of cells,
3ct
H+

Back 5

fibroblasts,
chondroblasts,
osteoblasts .

Hint 5

3 blasts

Front 6

Cells of the epiblast, through the process of gastrulation, give rise to all
3 germ layers =

Back 6

ectoderm,
intraembryonic mesoderm,
endoderm

Front 7

The term INTRAembryonic mesoderm describes the germ layer that forms during week

Back 7

wk 3

Front 8

the EXTRAembryonic mesoderm, which formed during week

Back 8

wk 2

Front 9

EXTRAembryonic mesoderm is involved in ________? formation =

Back 9

placenta

Front 10

INTRAembryonic mesoderm forms various=

Back 10

tissues and organs found in the adult,


What tissue forms this in the embryo?

Hint 10

Intraembryonic mesoderm

Front 11

Paraxial mesoderm is a thick plate of mesoderm located on each side of the midline.
Paraxial mesoderm becomes organized into segments known as =

Back 11

somitomeres,

which form in a

Hint 11

craniocaudal sequence.

Front 12

determining age of the embryo is done how =

Back 12

number of somites

Front 13

The number of somites is one of the criteria for determining =

Back 13

age of the embryo.

Front 14

Intermediate mesoderm : is a longitudinal dorsal ridge of mesoderm located between the paraxial mesoderm and lateral mesoderm. =

Back 14

This ridge forms the urogenital ridge

, which is involved in the
formation of the future =

Hint 14

kidneys and gonads.

Front 15

notochord has a number of important functions

Back 15

-ectoderm to differentiate into
neuroectoderm to form the neural plate.

-It induces the formation of each vertebral body.

-It forms the nucleus pulposus of each intervertebral disk.


What forms these? =

Hint 15

notochord

Front 16

The notochordal process grows

Back 16

cranially

Front 17

Caudal to the primitive streak there is a circular area-the cloacal membrane, which indicates the future site of the

Back 17

anus

Front 18

-Ectoderm
into
-Neuroectoderm
into
-Neural plate.

-Vertebral body formation .

-Nucleus pulposus

What forms these =

Back 18

NOTOCHORD

Front 19

Formation and differentiation of three germ layers
↓
▪Appearance of primitive streak
↓
▪ Somite formation
↓
▪Development of notochord
↓
▪Neural tube and Neural crest formation
↓
▪Completion of chorionic villi formation

Back 19

3 germ layers
↓
primitive streak
↓
▪ Somite formation
↓
▪Development of notochord
↓
▪Neural tube and Neural crest
↓
▪chorionic villi