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Once upon a time, when mankind did not yet have such a wonderful invention as a microscope, what kind of thoughts did not occur to people to explain the miracle of conception. In addition to the divine influence for this process, it was believed that tiny little men live in the male seed - homunculi, which, getting int
Read moreContinuing the topic of changes in the quality of sperm and sperm formation (see the previous article "Oligospermia and oligozoospermia"), today we will talk about such violations as aspermia and aspermatism. Aspermia is a disease characterized by the absence of spermatozoa and immature spermatogenesis cells in the sem
Read moreQuestions from patients who are diagnosed with oligospermia and oligospermatism are often sent to our site’s mail. Men are interested in what, in fact, these diseases are, what is the difference and are there any prospects for having children?
Read moreBefore birth, the lungs are filled with a liquid that has a high concentration of chlorides, a low protein content, a little mucus produced by the cells of the bronchial glands, and a surfactant. The amount of surfactant in the alveolar fluid increases, especially in the last weeks before birth.
Read moreAt the end of the fifth week of embryogenesis, the intra-embryonic mesoderm forms the axial part on both sides of the midline, the intermediate part, and the lateral plate
Read moreThe structure of birth membranes in twins can vary greatly, depending on the type of twins. About two-thirds of the twins are dizygotic; the frequency of their appearance is 7-11 per 1000 births, increasing with increasing age of the mother
Read moreAt the end of pregnancy, the placenta becomes of disk-shaped form with a diameter of 15-25 cm and of about 3 cm thickness and a 500-600 g. of weight. During childbirth, it breaks away from the uterine wall and approximately 30 minutes after the birth of the baby, it is expelled from the uterine cavity.
Read moreThe period from the beginning of the third month to the end of fetal life is called the fetal, or fetal period. It is characterized by the maturation of tissues and organs and the rapid growth of the body.
Read moreThe embryonic period lasts from the third to the eighth week of development. During this period, three folia embryonalia— the ectoderm, mesoderm, and endoderm — give rise to tissues and organ systems. As a result of the formation of organs, body contours are formed.
Read moreA characteristic event of the third week of development is gastrulation - the process of formation of three folia embryonalia (the ectoderm, mesoderm, and endoderm) of the embryo.
Read moreSometimes abnormal implantation sites occur even in the uterus. Normally, a blastocyst is implanted along the posterior or anterior walls of the uterus. Occasionally, a blastocyst is implanted close to the internal pharynx of the cervix, which in the late stages of placenta development leads to blockage of the pharynx
Read moreAfter the embryo reaches the two-cell stage, it carries out a series of mitotic divisions (crushing process).
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