Fertility/ Conception

    Cards (12)

    • Parasympathetic Innervation of Penis?
      Mediator of erections
      From sacral segments
      Release NO and Ach
    • Sympathetic Innervation of Penis?
      T12- L2 in nerve plexus'
      Responsible for ejaculation
    • Sensory Innervation of Penis?
      Entire penis, especially glans
      From pudendal nerve
    • Erection?
      Parasympathetic from cavernous nerve release NO to dilate vessels
      Cavernous pressure increases so compression of venous drainage
    • Ejaculation?
      Seminal fluid in external urethra signals from pudendal nerve enter sacral cord
      Synapse in spinal cord in Onuf's nucleus
      Pundenal nerve innervates muscles which contract to expel semen
    • Erectile tissue in females = between opening of vagina and head of clitoris
    • Parasympathetic to female genitalia?
      S2-4 release Ach and NO to cause vasodilation and engorgement to add in attachment of penis and innervation of Bartholian glands
    • Stimulation of female external genitalia results in reflex motor activation from Onuf's nucleus
    • During menstruation Lactobacillus in vagina produces lactic acid giving vagina pH of 4.5
    • Seminal fluid contains fructose to give energy to sperm and can neutralise acidic environment of vagina
    • Sperm enter upper vagina and uterine contractions propel sperm to fallopian tubes to ampulla for fertilisation
    • Head of sperm (acrosome) contains enzymes which degrade corona radiata allowing sperm to access zona pellucida causing Ca spike to stop further fertilisation
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