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NBME 24 Answers

nbme24/Block 4/Question#49 (50.9 difficulty score)
A 27-year-old man sustains a spinal cord ...
Penile stimulationπŸ”
tags: neurology erections 

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submitted by sattanki(62),
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lsmarshall  Just saw a good summary of nerves/vessels involved saying, "pelvic parasympathetic fibers from S2-S4 can cause cavernous arteriole vasodilation via the cavernous nerve without of central stimulation." +7  
seagull  S2-3-4 keeps the penis off the floor +33  
drdoom  Modifying @seagull into iambic pentameter: β€œS2, S3, and Number 4 / keeps the big ole penis / off the floor” +  
myoclonictonicbionic  I can assure you the validity of answer (speaking from experience) +2  
raddad Under the "autonomic control" header +  
llamastep1  I've always wondered how quadraplegics got it up. I guess their girls help em lol +  

submitted by cinnapie(15),
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Why edso yvree ENBM vaeh oen or wto otncreei elrtaed si?uet?qsno

youssefa  Cause we all know what bout to happen to us in this exam :D +31  
niboonsh  lmfaooooooo +  
corgilobacter  erections are a very hard subject +5  

submitted by susyars(20),

From a girls perspective, is really hard to understand this penis/erection physiology questions

john055  hahaha. thats hilarious lol +  
thisshouldbefree  from a males perspective it is really hard to understand the mensural cycle +4  

submitted by charcot_bouchard(332),
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pAtperlnay eethsr roel fo tsmctephayi ymsets in shpnieccgoy tncoeire nda tis mosce ormf .1L21-T oS fi ntpatei hvea rctoanntisa ta L5 hyte sole fxrlee cirnteeo but illst iretan pcihnegscoy no.e

BeovA 9T canstnoitar auecs lsso fo nphoycegics tceirone

charcot_bouchard  Below L5* (Not at) +  

submitted by syoung07(10),

Robin Williams once said "God gave men two heads and only enough blood to work one at a time". Might help yall conceptualize that the penis has a "brain" of its own. The erotic dreams, reading and viewing erotic material all require input from the brain to reach the penis whereas penile stimulation is a local reflex.

submitted by paperbackwriter(80),

Worth noting that not only is there a separate reflex arc for non-psychogenic ejaculation, but that glandular secretion, emission (contraction of everything besides the penis muscles), and ejaculation (contraction of penis muscles i.e. ischiocavernosus and bulbospongiosus) are all under reflex control.

-- All efferents are parasympathetic EXCEPT for emission (sympathetic) and ejaculation (somatic). -- all afferents are pudendal n. except for psychogenic erection which starts with higher centers