3.3 Short Answer Questions
1) The embryonic ________ ultimately form the arms and legs of the adult.
2) By the end of week 3, the mesoderm has divided into the somites, intermediate mesoderm, and ________.
3) Splanchnic mesoderm gives rise to components of the cardiovascular system, including ________.
4) Somites differentiate into dermatomes, myotomes, and ________.
5) The sex of the fetus can be determined externally by approximately month ________.
6) The hand develops with ________ between the fingers.
7) This is the most common preventable cause of mental retardation in the United States.
8) Defects in the development of the neural tube may be linked to inadequate dietary intake of ________.
9) ________ is a clinical procedure that provides a genetic profile for a fetus.
10) A ________ abortion is one in which the fetus dies and is naturally aborted.
11) The wall and lining of the gut develop from the mesoderm and ________, respectively.
12) Name three primary germ layers in the embryo.
13) The ________ is the embryonic stage that implants in the uterus.
14) A primitive characteristic that an adult human retains only in part, but is important in determining bilateral symmetry is the ________.
15) The intermediate mesoderm forms the ________.