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Ordinarily We Need to Know Not Only What Something Is,but

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Essay

Ordinarily we need to know not only what something is,but also where it is.Because vision doesn't give us this information directly,we must infer it.Explain five of the visual cues listed in the textbook.


Definitions:

Blastocyst

A stage of embryonic development in mammals, occurring roughly five days after fertilization, marked by the formation of a fluid-filled cavity and the differentiation of the embryo into two layers.

Fetal Period

The period in prenatal development from nine weeks after conception until birth, when the brain continues developing, bodily structures are refined, and the fetus grows in length and weight and accumulates fat in preparation for birth.

Germinal Period

The initial two weeks of prenatal development following conception, characterized by rapid cell division and attachment to the uterine wall.

Embryonic Period

The stage of prenatal development from approximately the second to the eighth week after fertilization, during which major organs and structures within the embryo begin to develop.

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