Wikimedia Commons has media related to Fetus. Prenatal Image Gallery Index at the Endowment for Human Development website, featuring numerous motion pictures of human fetal movement. “In the Womb” (National Geographic video).

The head makes up nearly half of the fetus’ size. Breathing-like movement of the fetus is necessary for stimulation of lung development, rather than for obtaining oxygen. The heart, hands, feet, brain and other organs are present, but are only at the beginning of development and have minimal operation.

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There are only two stage 3 embryos in the Carnegie collection. There are four characteristic processes that CS3 embryos go through cavitation, collapse and expansion, hatching, and discarding of cells. The initiation of cavitation indicates the start of CS3.

Carnegie stage 1 is the unicellular embryo. This stage is divided into three substages. Primordial embryo. All the genetic material necessary for a new individual, along with some redundant chromosomes, are present within a single plasmalemma. Penetration of the fertilising sperm allows the oocyte to resume meiosis and the polar body is extruded.

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