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Chap. 4
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1st Grade
03/24/2016

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Term

 

The bilaminar embryonic disc is converted into a                         during              .

These changes begin with the appearance of the               , which appears at the beginning of the third week as a thickening of the epiblast at the               of the embryonic disc.

 

Definition

trilaminar embryonic disc

gastrulation

primitive streak

caudal end

Term

 

The                 results from migration of epiblastic cells to the median plate of the disc.

                    of epiblastic cells from the primitive streak give rise to              cells that migrate ventrally, laterally, and cranially between the             and            .

 

Definition

primitive streak

Invagination

mensenchymal

epiblast

hypoblast

Term

 

As soon as the primitive streak begins to produce                  , the epiblast is called                  .

Some cells of the epiblast displace the hypoblast and form                    .

                  produced by the primitive streak soon organize into a third germ layer, the                             , occupying the area between the former hypoblast and cells in the epiblast.

Cells of the            migrate to the edges of the embryonic disc, where they join the                  covering the                 and                           .

 

Definition

mesenchymal cells

embryonic ectoderm

embryonic endoderm

mesenchymal cells

intraembryonic (embryonic) mesoderm

mesoderm

extraembryonic mesoderm

amnion

umbilical vesicle

Term

 

At the end of the third week, the embryo is a flat ovoid embryonic disc.

Mesoderm exists between the ectoderm and endoderm of the disc everywhere except at the                     , in the median plane occupied by the                  , and at the                       .

 

Definition

oropharyngeal membrane

notochord

cloacal membrane

Term

 

Early in the third week, mesenchymal cells from the primitive streak forms the                 between the embryonic ectoderm and endoderm.

The notochordal process extends from the primitive node to the                  .

Openings develop in the floor of the                 , and they soon coalesce, leaving a                .

This plate infold to form the            , the primordial axis of the embryo around which the              forms (eg. vertebral column).

 

Definition

notochordal process

prechordal plate

notochordal canal

notochordal plate

notochord

axial skeleton

Term

 

The                appears as a thickening of embryonic ectoderm, induced by the developing                   .

A longitudinal                develops in the neural plate, which is flanked by              .

Fusion of the folds forms the             , the primordium of the            .

 

Definition

neural plate

notochord

neural groove

neural folds

neural tube

CNS

Term

 

As the neural folds fuse to form the neural tube, neuroectodermal cells form a                 between

the surface ectoderm and neural tube.

 

Definition
neural crest
Term

 

The mesoderm on each side of the notochord condenses to form longitudinal columns of                         , which, by the end of the third week, give rise to            .

 

Definition

paraxial mesoderm

somites

 

Term

 

The              within the embryo arises as isolated spaces in the lateral mesoderm and cardiogenic mesoderm.

The                 subsequently coalesce to form a single, horseshoe-shaped cavity that eventually give rise to            .

 

Definition

coelom(cavity)

coelomic vesicles

body cavity

Term

 

               first appear in the wall of the umbilical vesicle, allantois, and chorion.

They develop within the embryo shortly thereafter.

                            develop from different hematopoietic precursors.

 

Definition

Blood vessels

Fetal erythrocytes

Term

 

Blood vessels first appear in the wall of the                                  , and              .

They develop within the embryo shortly thereafter.

Fetal erythrocytes develop from different hematopoietic precursors.

 

Definition

umbilical vesicle

allantois

chorion

Term

 

The                   is represented by paired endocardial heart tubes.

By the end of the third week, the heart tubes have fused to form a                that is joined to vessels in the embryo, umbilical vesicle, chorion, and connecting stalk to form a                                  .

 

Definition

primordial heart

tubular heart

primordial cardiovascular system

Term

 

The premordial heart is represented by                                          .

By the end of the third week, the heart tubes have fused to form a tubular heart that is joined to vessels in the                   ,                      ,                , and                           to form a primordial cardiovascular system.

 

Definition

paired endocardial heart tubes

embryo

umbilical vesicle

chorion

connecting stalk

Term

 

Primary chorionic villi become                        as they acquire mesenchymal cores.

Before the end of the third week, capillaries develop in the secondary chorionic villi, transforming them into                       .

Cytotrophoblastic extensions from the stem villi join to form a                        that anchors

the chorionic sac to the endometrium.

 

Definition

secondary chorionic villi

tertiary chorionic villi

cytotrophoblastic shell

Term

 

Primary chorionic villi become secondary chorionic villi as they acquire                               .

Before the end of the third week,                   develop in the secondary chorionic villi, transforming them into                       .

Cytotrophoblastic extensions from the stem villi join to form a                        that anchors

the chorionic sac to the endometrium.

 

Definition

mesenchymal cores

capillaries

tertiary chorionic villi

cytotrophoblastic shell

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