Before We Are Born: Essentials of Embryology and Birth by Keith L. Moore, T. V. N. Persaud

By Keith L. Moore, T. V. N. Persaud

0 in at the such a lot crucial innovations in human embryology and improvement! Concise and richly illustrated, this well known e-book promises the embryology wisdom you would like in a hugely effective, reader-friendly layout. The comprehensively up-to-date seventh version comes with entry to the full contents on-line through pupil seek advice, plus 18 exceptional embryology animations, extra overview questions and solutions, and extra* Editor Keith L. Moore, BA, MSc, PhD, FIAC, FRSM is the recipient of the 1st (2007) "Henry Gray/Elsevier unusual Educator Award"-the American organization of Anatomists' optimum award for excellence in human anatomy schooling on the medical/dental, graduate, and undergraduate point of teaching-a testomony to his masterful educating skills, which help in making this e-book such an efficient instrument for studying the advanced topic of human embryology.

<lI>Succinct insurance specializes in the main need-to-know human embryology concepts.

<Li>Over 1,300 crisp illustrations and updated scientific pictures carry the fabric to life.

<lI>Review questions and solutions on the finish of every bankruptcy attempt your wisdom and assist you organize for exams.
* Sweeping updates replicate the entire most up-to-date advances, together with IVF, cloning, and genes in human development.

* buy of this pupil seek advice name comprises entry to the entire contents on-line at www.studentconsult.com-as good as 18 amazing, in particular constructed animations that convey embryological improvement to lifestyles, and 1000s of extra help questions and solutions to check your mastery of the cloth.

<Li>New individuals supply a wealth of unpolluted views at the most recent wisdom.

* a brand new, extra undemanding, full-color structure is helping you grasp key embryology recommendations extra simply than ever, and a smaller dimension makes the e-book extra portable.

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Additional resources for Before We Are Born: Essentials of Embryology and Birth Defects (7th Edition)

Example text

PROLIFERATIVE PHASE The proliferative phase, lasting approximately 9 days, coincides with growth of the ovarian follicles and is controlled by estrogen secreted by these follicles. There is a twoto threefold increase in the thickness of the endometrium during this time. Early during this phase, the surface epithelium of the endometrium regenerates. The glands increase in number and length, and the spiral arteries elongate (see Fig. 2-2C). LUTIAL PHASE The luteal (secretory) phase, lasting approximately 13 days, coincides with the formation, function, and growth of the corpus luteum.

The ejaculate of normal males usually contains more than 100 million sperms per milliliter of semen. Although there is much variation in individual cases, men whose semen contains a minimum of 20 million sperms per milliliter, or 50 million in the total specimen, are probably fertile. A man with less than 10 million sperms per milliliter of semen is likely to be sterile, especially when the specimen contains immotile and abnormal sperms. For potential fertility, at least 40% of sperms should be motile after 2 hours, and some should be motile after 24 hours.

C, The pronuclei ilre fusing. D, The zygote hils formed; it contilins 46 chromosomes, the diploid number. • e • e lysis of the zona pellucida, thereby forming a path for the sperm to follow to the oocyte. Once the sperm penetrates the zona pellucida, a zona reaction occurs, changing the physical properties of the zona pellucida and making it impermeable to other sperms. Fusion of the plasma cell membranes of the oocyte and sperm. The cell membranes break down at the area of fusion. The head and tail of the sperm then enter the cytoplasm of the oocyte, but the plasma membrane of the sperm remains behind (see Figs.

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