Freebase(0.00 / 0 votes)Rate this definition: Ibid. Ibid. is the term used to provide an endnote or footnote citation or reference for a source that was cited in the preceding endnote or footnote. This is similar in meaning to idem, abbreviated Id., which is commonly used in legal citation. To find the ibid. source, one must look at the reference preceding it. Anagrams for ibid. Â»
Fertilization and Embryo Development. Following ovulation, the egg is capable of fertilization for only 12 to 24 hours. Contact between the egg and sperm is random. Once the egg arrives at a specific portion of the tube, called the ampullar-isthmic junction, it rests for another thirty hours. Fertilization â sperm union with the egg â occurs in this portion of the tube. The fertilized egg then begins a rapid descent to the uterus.
Pregnancy does not start at conception. Once an egg is fertilized it can take around 6-10 days for that fertilized egg to then travel down the fallopian tube and to the uterus where it can then implant for pregnancy to occur. How long this takes can vary on factors such as where the egg is fertilized in the fallopian tube and overall health. Depending on where a woman is in her cycle pregnancy could occur anywhere from between 6-17 days after sex.