The tail.Also called the flagellum, the tail propels the sperm forward and through the female’s uterus and fallopian tubes in search of an egg to fertilize. The tail makes up about 90% of the sperm’s length. Sperm vs. Semen
Male human beings produce 1,000,000,000,000,000,000,000,000 times more sperm than females produce eggs.–WTF Fun Facts Source:
Should I Freeze My Egg and/or Sperm or My Embryo(s)? Depending on your situation, you may choose to freeze your eggs, sperm, or embryos. Each method can be beneficial for the right patient. You will have help in deciding which option is right for you. At Reproductive Fertility, we wi...
egg death (Levitan, 2002, 2004). Yet recent work suggests that the optimal sperm concentration for maximizing fertilization can vary dynamically as a function of egg concentration, gamete compatibility traits, ocean pH, source population and the size of sea urchins. For example, high egg ...
J. Unravelling anisogamy: Egg size and ejaculate size mediate selection on morphology in free-swimming sperm. Proc. R. Soc. B Biol. Sci. 283, 20160671. https://doi.org/10.1098/Rspb.2016.0671 (2016). Article Google Scholar Parker, G. A. & Begon, M. E. Sperm competition games—sperm...
female or a male baby is split more evenly. Finally, the ability to preselect a child’s sex may help families limit their size. For example, using gender selection technology, a family with three boys could increase their likelihood of having a girl as their fourth and last child instead ...
Full size image In Stage 1, the pre-mammalian centriolar configuration, spermatozoa include a canonical proximal centriole and a canonical distal centriole, representing the ancestral animal configuration. At this stage, the two centrioles are required for early embryogenesis (zygote to blastocyst), ...
Grade 1: Small in size; noticeable during an examination when using the Valsalva manoeuvre (straining). Grade 2: Small to medium in size; noticeable without the Valsalva manoeuvre. Grade 3: Large in size; visible to the eye and often accompanied by a prominent bulge in the scrotum. Can a...
Although such differences may be a function of the large sample size and thus not clinically relevant, our findings suggest that use of ICSI may improve fertilization rates but not implantation or pregnancy rates in the setting of unexplained infertility, advanced maternal age, and low oocyte yield...
Sex selection through timely intercourse is based on the respective characteristics of the X- and Y-chromosome-bearing spermatozoa, favoring one or the other toward reaching and fertilizing the egg (). The ethicality of sex selection remains an unsettled and controversial topic; some countries allow...