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.
Sperm can live up to 72 hours once ejaculated. Sometimes the egg is found within 45 minutes for fertilization, while sometimes it can take as long as 12 hours. If the egg isn't yet released from the ovary, it is thought that the sperm can go into a holding pattern for about 24-48 hours while awaiting release of the egg.ometimes the egg is found within 45 minutes for fertilization, while sometimes it can take as long as 12 hours. If the egg isn't yet released from the ovary, it is thought that the sperm can go into a holding pattern for about 24-48 hours while awaiting release of the egg.