Basic Sciences for Obstetrics and Gynaecology by Tim Chard MD, FRCOG, Richard Lilford MRCOG, MRCP (auth.)

By Tim Chard MD, FRCOG, Richard Lilford MRCOG, MRCP (auth.)

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It is attached to the pubic arch by a suspensory ligament and is covered by stratified squamous epithelium with numerous sweat and sebaceous glands except on the glans itself. 1. The arterial supply is the dorsal artery of the clitoris (terminal branch of the internal pudendal), which divides into deep and dorsal branches as it enters the clitoris. A venous plexus beginning at the glans drains to the pudendal plexus and thence to the pudendal vein. Anatomy 39 Vestibule and Bartholin's gland The vestibule lies between the labia minora and the hymen (the latter is a perforated membrane which in the parous or postcoital individual consists of skin tags or carunculae myrtiformes).

G. IgG and purines). Some small inert molecules, such as water and antipyrine, diffuse readily across the placenta; clearance is limited only by blood-flow (flow limited). Other substances do not diffuse rapidly (permeability limited) (Fig. 22). g. glucose and essential amino acids). Placental perfusion The maternal uterine blood-flow reaches 700-750 ml/mim at term, of which about three-quarters is directed towards the placenta while the remainder supplies the myometrium. Because the placenta has a low-resistance circulation, high flow rates are recorded even during maternal diastole.

Dorsal aspect of an IS-day presomite embryo. AA indicates the level of section in Fig. 17. Amnion Embryonic mesoderm Ectoderm Endoderm Fig. 17. Section of the presomite embryo at the level indicated in Fig. 16. The placenta Strudure of the mature placenta The placenta is composed of some 200 lobules. Each of these represents the system arising from a primary stem villus. The tertiary stems are arranged in circles around a hollow core. ::~~.. ': Cardiogenic Notochord plate Buccopharyngeal membrane Mesoderm Allantois in body stalk Fig.

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