Male Sexual Physiology

  1. What are the four stages of human sexual response?
    • Excitement
    • Plateau
    • Orgasm
    • Resolution
  2. ____ is the stage with heightened physiological arousal which include increased breathing, blood flow to skin surface and fast heart rate
  3. Erection occurs in ____ stage
  4. Bulbourethral glands secretion release- pre-ejaculatory fluid- is _____ stage
  5. _____ is the stage of maximum physiological arousal, could be sustained for a period of time prior to orgasm
  6. “sex flush,” reddening of the skin on the abdomen and breasts, occurs in ____ stage.
  7. _____ stage is accompanied by muscular contraction of the pelvic floor muscles
  8. Ejaculation occurs during_____
  9. What term describes the physiologic pause after ejaculation?
    Refractory period
  10. Decrease in arousal when sex is finished is referred to as _______ phase
  11. T/F: females who experience multiple orgasms, return to plateau arousal followed by one or more additional orgasms
  12. Fancy word for erection is _____
  13. During erection, _______(contraction/relaxation) of the smooth muscle, mainly the_______(specific muscle)
    • Relaxation
    • Corpus cavernosa
  14. Which ANS division is responsible for erection?
  15. Parasympathetic fibers from the _____ and ___ portions of the spinal cord, travel via the ____ nerves and plexus and the _____ nerves to the penile corpora and vasculature. Resulting in vaso____ of the penile blood vessels.
    • Lumbar and sacral portions of the spinal cord
    • Pelvic nerves, pelvic plexus
    • Cavernous nerves
    • Dilation
  16. Penile flaccidity (aka detumescene) is mediate by the ____ nervous system. Where preganglionic fibers exit the ____ cord and synapse in prevertebral ganglia. Postganglionic fibers would then reach the genitalia via the ___ nerves, ___ plexus.
    • Sympathetic
    • Thoracolumbar
    • Hypogastric cavernous
    • Pelvic plexus and then cavernous nerves
  17. ____ motor fibers from the sacral spinal cord form branch of the ____ nerve and innervate the striate penile muscles
    • Somatic
    • Pudendal
  18. Tactile sensation of the penis is due to ____ nerve
    Dorsal (main terminus of the sensory pudendal nerve)
  19. T/F: erection can only take place when there is input from higher brain centers
    False; can take place without input from higher brain centers and solely via tactile stimuli (mainly dorsal penile nerve). Though can be stimulated by descending pathways form the cerebral cortex
  20. Spontaneous erections occur during the REM sleep as a result of _________
    Cerebral cortex stimulation
  21. _____diffuses across the extracellular space to the smooth muscle cell where it binds to
    • guanylyl cyclase. Guanylyl cyclase generates _____, which activates _____, which helps to remove phosphate from the _____and the smooth muscle relaxes
    • Nitric oxide
    • cGMP
    • Myosin light chain phosphatase
    • myosin head
  22. emission is the result of peristaltic _____ of the ampullary portion of the vas deferens, the seminal vesicles and the prostatic smooth muscles surrounding the prostatic urethra, and accompanied by _____ of the internal bladder sphincter which is under ______ control
    • contraction
    • constriction
    • sympathetic
  23. T/F: ejaculation is a spinal cord reflex though also under considerable cerebral control
  24. Ejaculation is normally ____ of the internal urethral sphincter, while retrograde ejaculation occurs when the sphincter ______
    • Constriction
    • Fails to constrict (so semen enters the urinary bladder instead of down the urethra)
  25. What could be a likely cause for lack of emission or retrograde ejaculation?
    Disruptions to the Innervation of the vas deferens and bladder neck (ie DM, MS)
  26. What type of drug could help men with retrograde ejaculation or diminished emission?
    Sympathomimetic drugs could promote normal ejaculation by increasing the tone of the vas deferens and the internal sphincter
  27. T/F: excitement or arousal phase of the male sex response may be initiated by a multitude of internal or external stimuli, including psychological factors such as thoughts and emotions
    False; this describes female excitement phase, male just needs to sensory stimuli cuz theyre dense
  28. During the plateau stage, there is marked degree of ____ throughout the body
  29. Orgasms seem to be related to the _____ of the autonomic nervous system, as is the ejaculatory phase
  30. Early phases of sexual stimulation, _____ Signals dilate the arteries of the erectile tissues, likely due to release of Acetylcholine and _______.
    • Parasympathetic
    • Nitric oxide
  31. Which part of the female anatomy secrete mucus inside the introitus (opening of the vaginal canal)?
    Bartholin’s gland
  32. Parasympathetic efferent controlling sexual response arise from the ____ plexus
Card Set
Male Sexual Physiology
Endo exam 3