Exam 3: The Tissue Level of Organization

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

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

Quickening occurs (mother feels fetus moving).

During the blastocyst stage, there are three cell layers evident.

The ability of one group of cells to influence development of neighboring cells is called gastrulation.

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

The amniotic sac is derived from the epiblast, while the placenta develops from the

Somites differentiate into dermatomes, myotomes, and .

Neural crest cells are derived from this germ layer.

Describe the types of tissues that make up the endoderm, ectoderm, and mesoderm, and explain how these tissues relate to their developmental processes.

Most organ systems are fully formed and ready to function in the fetus by the sixth month. Which of the following systems is the exception to this generalization because it takes longer to finish development?

Somatic mesoderm gives rise to all of the following except

The correct sequence for embryonic development is

The bodyʹs axis of development is determined by the

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

The three primary germ layers are the endoderm, myotome, and exoderm.

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

This develops into the epidermis of the skin.

The yolk sac, formed from the hypoblast, has little yolk in the human embryo.

As a result of folding, the embryo acquires a tadpole shape by