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The division of cells in a zygote is called?

A Cleavage

The solid mass of cells that results from cleavage of the zygote is the

morula

Male and female fetuses can first be distinguished by their genitalia at

3 months

Chemical, physical, or biological agents that can induce birth defects are called

teratogens

Fertilization is to zygote as cleavage is to _____

Morula

Implantation of the blastocyst on the uterine lining takes about

1 week

What is the correct sequence for embryonic development is

zygote, morula, blastocyst

The hand develops with ________ between the fingers

webbing

_______ is a clinical procedure that provides a genetic profile for a fetus

Amniocentesis

A ________ abortion is one in which the fetus dies and is naturally aborted

spontaneous

Name three primary germ layers in the embryo

endoderm, ectoderm, and mesoderm

The ________ is the embryonic stage that implants in the uterus

blastocyst

_____ develops into the lining of the gastrointestinal tract

endoderm

The epiblast develops a primitive streak during days 14-15, the initial cells that ingress through the primitive streak become this germ layer

endoderm

Mucus-producing glands of the respiratory tract arise from this layer

endoderm

The ectoderm develops into the epithelium of the skin, whereas this layer gives rise to the epithelial lining of the gut tube.

endoderm

The splanchnic mesoderm forms next to this layer

endoderm

The urinary bladder is derived from which embryonic layer

endoderm

The wall and lining of the gut develop from the mesoderm and ________

endoderm

______ develops into the brain and spinal cord

ectoderm

______ develops into the epidermis of the skin

ectoderm

What embryonic epiblast cells that remain on the surface of the trilaminar disc are ultimately called

ectoderm

The neural tube develops from this layer

ectoderm

Neural crest cells are derived from this germ layer

ectoderm

The mesoderm located deep to the neural tube forms the kidneys and the gonads is the ________

intermediate mesoderm

The ribs and vertebrae form from this primary germ layer?

mesoderm—somites

This layer will give rise to the bones ligaments and joints of the embryonic limbs

mesoderm

The dermis of the dorsal body region is derived from somites. However, the dermis of the ventral body region is derived from

mesoderm—lateral plate.

Blood vessels and the heart arise from this primary germ layer

mesoderm—lateral plate

The middlemost embryonic germ layer to develop is

mesoderm

Gonads arise from what embryonic structure?

intermediate mesoderm

Splanchnic mesoderm forms the ______

heart

Mesenchyme would refer to ________ but not ________

mesoderm; ectoderm

The primary germ layer that ultimately forms the serous membranes of the peritoneum is

mesoderm

The cavity in the mesoderm that ultimately develops into the peritoneal, pericardial, and pleural cavities is called

coelom

Splanchnic mesoderm gives rise to components of the cardiovascular system include

the heart and blood vessels

By the end of week 3, the mesoderm has divided into the somites, intermediate mesoderm, and ________

lateral plate

The intermediate mesoderm forms the ______

Kidneys and gonads

The body's axis of development is determined by the

notochord

A primitive characteristic that an adult human retains only in part, but is important in determining bilateral symmetry is the ______

notochord

What is the proper sequence for neurulation?

neural plate, neural groove, neural tube

A transverse section through the 24-day embryo, dorsal to ventral, would first contact the

neural tube

The neural tube of the embryo develops into the

neural tube

The embryonic layer that invades the lining of the uterus and forms the placenta is the

trophoblast

Somites differentiate into dermatomes, myotomes, and ________

sclerotomes