Medicine powerpoints

Jun 29th, 2015
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Kaplan University
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Comprehensive power points in internal medicine, gynecology, psychiatry, pharmacology, etc.

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Placental DevelopmentPregnancy occurs when healthy spermatozoa in significant numbers adequate numbers penetrate cervical mucus, ascend through a patent uterotubal tract and fertilizes a healthy ovum within 24 hours following ovulationSpermatozoa travel at the rate of 6mm per minuteDuring this transit, an enzymatic change occurs that renders the spermatozoa capable of fertilizing the ovum in a process called capacitation.The cellular union between the sperm and the egg is referred to as a SYNGAMYThe tip of the sperm head (acrosome) loses its cell membrane and probably releases a lytic enzyme that facilitates the penetration of the zona pellucida surrounding the ovum.Once the sperm head containing all of the paternal genetic material enters the cytoplasm of the ovum, a 'Zona reaction' occurs that prevents the entrance of a second sperm.The first cleavage occurs during the next 36 hoursPeristaltic activity of the uterine tube slowly transports the conceptus into the uterine cavity, a journey of 6-7 days (around 3 days according to Sewe.)MyNB: Ciliary action lost to Trichomoniasis hence ectopic preganncy.A series of divisions creates a hollow ball, the blastocysts which then implants within the endometrium. Within a few hours after implantation, the trophoblasts invades the endometrium and begins to produce Human Communic Gonadotrophin HcG. As the cytotrophoblasts (Langerhans cells ) mature & proliferate, they form transitional cells that are ultrastructurally mor

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