Titlebook: Human Reproduction and Developmental Biology; D. J. Begley,J. A. Firth,J. R. S. Hoult Textbook 1980Latest edition D. J. Begley, J. A. Firt

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樹(shù)木中

The Male Reproductive System, onwards. There are no cyclic variations in the plasma levels of pituitary gonadotropins or of testosterone secreted from the interstitial cells of the testis. The formation of male gametes, spermatogenesis, within the seminiferous tubules is also continuous and their maturation proceeds as they mov

HUMP

Coitus and Fertilisation,eing differs from most mammals in that sexual intercourse not only satisfies a basic drive but also produces pleasure and gratification of a character and intensity unequalled by any other activity. Although many other mammals show signs of extreme sexual excitement before coitus, the observer does

ARCHE

Implantation and Establishment of the Conceptus,totic figure of the first cleavage. Despite the fact that each gamete contributes 23 chromosomes to the zygote, the contributions of egg and sperm to the development of the embryo are not equal in practice. Because the zygote cytoplasm is almost entirely derived from the egg (see section 4.7), all o

吝嗇性

Embryogenesis and its Mechanisms,ntly arbitrary distinction is of some value since the embryonic period is the phase of establishment of external and internal body form whereas the fetal period involves mainly the growth and maturation of origins already present.

Intuitive

SPECT

吸氣

The Initiation and Course of Labour,nstrual period, with the majority of pregnancies lying between these limits. However, in extremely rare cases, normal babies have been born after as little as 32 or as much as 52 weeks of gestation. Gestational age is most often calculated from the first day of the last menstrual period which occurs

吝嗇性

Adaptations of the Newborn to Extrauterine Life,er, the term has no special physiological significance as many of the changes required for extrauterine life follow a different time course; some occur at birth whereas others are more protracted and take place over a period of weeks or months.

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