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Search thousands of pregnancy and birth related topics in the largest free pregnancy encyclopedia on the net. |
Y Chromosome - The sex chromosome that plays a role in the sex determination of a fertilized egg. Males have one X and one Y chromosome, while females have two X chromosomes.
Yaws - A contagious bacterial skin infection that is characterized by eruptions of papules on the face, hands, feet and external genitalia. Anyone can be affected by the disorder, but it is most commonly seen in children under the age of 15 in warm, tropical areas.
Yeast Infection - An infection of the vagina that is caused by a type of yeast called Candida albicans. Yeast infections are more common during the second trimester of pregnancy. A yeast infection occurs when the normal levels of acid and yeast in the vagina are out of balance, which allows yeast to overgrow. Symptoms of a yeast infection include itching, burning, redness and a white, lumpy discharge that resembles cottage cheese and smells like bread. Creams and suppositories are safe for the treatment of a yeast infection during pregnancy. If a yeast infection is not treated during pregnancy, it can be passed to the baby during delivery in a condition known as thrush.
Yeast Vulvitis - A yeast infection of the external genital organs, which includes the labia, clitoris and entrance to the vagina. The infection commonly is present with yeast vaginitis, which affects the vagina. The most common symptoms of the infection include itching, burning, soreness, pain during sexual intercourse, pain while urinating and vaginal discharge.
Yellow Body - The cell mass that remains after a follicle has released an egg, which becomes yellow after ovulation. The corpus luteum releases estrogen and progesterone. Progesterone is responsible for making the lining of the uterus thick for implantation and is important for a healthy pregnancy. The corpus luteum will continue to produce progesterone until ten weeks gestation, at which time the placenta will begin to produce progesterone to sustain the pregnancy.
Yolk Sac - The highly vascular umbilical vesicle that envelopes the nutritive yolk of a developing embryo. The yolk sac is attached to the embyro's midgut.
Yolk Stalk - A narrow tubular stalk that connects the yolk sac with the embryo through the umbilical opening during early fetal development. Typically, the yolk stalk would become concealed as fetal development continues. However, in approximately 3% of the population, a small remnant may remain which causes Meckelis diverticulum.
Yoon Ring - A nonreactive rubber band that is used for closing each fallopian tube as a procedure for female sterilization. The ring is placed around a 2-3 cm segment of fallopian tube, after being drawn inside a narrow cone-shaped applicator. Because the closed segment is deprived of blood, it will eventually turn into scar tissue.