Read Ebook: The Mother and Her Child by Sadler Lena K Lena Kellogg Sadler William S William Samuel

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THE FIRST WEEKS OF LIFE

The fertilized ovum remains in the tube for about one week, when it slowly makes its way down into the uterus, all the while rapidly undergoing segmentation or division. It does not grow much in size during this first week, but divides and subdivides first, into two parts, then four, then eight, then sixteen and so on, until we have a peculiar little body made up of many equally divided parts, and known as the "Mulberry Mass" . The blending of the sperm and ovum has been perfect, the division of the original body multitudinous.

While this division of the united sex cells is progressing, a wonderful change is also taking place in the inside lining of the uterus. Instead of the usual thin lining, it has greatly thickened and has become highly sensitized, and as the ovum enters the uterus from the fallopian tube, this sensitized lining catches it and holds it in its folds--actually covers it with itself--holding the precious mass much as the cocoon, you have so often seen fastened to the side of a plant or leaf, holds its treasure of life.

LATER EMBRYONIC DEVELOPMENT

In the fourth and fifth weeks, the lungs and the pancreas may be found, the heart develops, the nervous system has taken on more definite form, and several of the larger blood-vessels are appearing.

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