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By Lellis C., Muller S.

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The median plane is an imaginary vertical plane of section that passes longitudinally through the body. Median sections divide the body into right and left halves (Fig. 1-5C). The terms lateral and medial refer to structures that are, respectively, farther from or nearer to the median plane of the body. A sagittal plane is any vertical plane passing through the body that is parallel to the median plane (Fig. 1-5C). A transverse (axial) plane refers to any plane that is at right angles to both the median and coronal planes (Fig.

He also observed cleaving zygotes in the uterine tube and blastocysts in the uterus. He contributed new knowledge about the origin of tissues and organs from the layers described earlier by Malpighi and Pander. Von Baer formulated two important embryologic concepts: corresponding stages of embryonic development and that general characteristics precede specific ones. His significant and far-reaching contributions resulted in his being regarded as the father of modern embryology. Mattias Schleiden and Theodor Schwann were responsible for great advances being made in embryology when they formulated the cell theory in 1839.

From Gartner LP, Hiatt JL: Color Textbook of Histology, 2nd ed. ) FIGURE 2–10 Illustrations of ovulation. Note that fimbriae of the infundiulum of the uterine tube are closely applied to the ovary. The finger-like fimbriae move back and forth over the ovary and “sweep” the oocyte into the infundibulum. When the stigma (swelling) ruptures, the secondary oocyte is expelled from the ovarian follicle with the follicular fluid. After ovulation, the wall of the follicle collapses and is thrown into folds.

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