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☆
Initialvomeronasalstructuresinstagedhumanembryosareobservedbetweenweeks4and5(Carnegie
stages13to15
10
;Fig.4.1).Themedialepitheliumoftheolfactoryplacodegivesrisetothevomeronasal
neurons,nervusterminalis,cellsexpressinggonadotrophinreleasinghormone(GnRH),andsomefurther
neurons.
11,12
Vomero-nasalandterminalisgangliaappeararoundstages18and19asclustersofprotein
gene product 9.5 (PGP 9.5)–immunoreactive cells migrating out of the epithelium (Fig. 4.2a, c).
Vomeronasalandolfactoryaxonsstarttogrowintotheprimitiveolfactorybulb,andGnRHcellsbeginto
migratetothe hypothalamus,following vomeronasal or nervusterminalis substructures. Theynormally
beginreachingthemedianeminencebyweek8,butsomecellsmayremainalongthemigrationpathway.
13
An intriguing connectionbetween olfactionand sex becomesapparent ifGnRH cells fail to reachthe
hypothalamus,resultinginhypogonadotrophichypogonadism, often associatedwithanosmia (Kallmann
syndrome).
14,15
Aroundweek8,aVNDsimilartothatseeninrodentsbecomesvisible(Fig.4.1a).This
ductislinedbyneuroepithelialcellsreactiveforneurotubulin,neuralcelladhesionmolecule,andPGP
9.5, but not for OMP, a reliable marker for functional olfactory and rodent vomeronasal neurons. In
contrasttorodents,humansdonotformaclearlyseparateAOB.
16,17
Fig.4.1a,bThevomeronasalductinadulthumans.
aLocationofthevomeronasalductinadulthumans.Thedottedlineindicatesthevomeronasalnerveprojection(absentinhumans).Thereis
noaccessoryolfactorybulb.CNV1,cranialnerveV1;CNV2,cranialnerveV2.(ModifiedfromSchünkeetal.ThiemeAtlasofAnatomy.
Head,NeckandNeuroanatomy.Stuttgart,NewYork:Thieme;2007:116.)
bEndoscopyoftheleftnasalcavityshowingtheorificeofthevomeronasalduct(arrow).Se,anteriornasalseptum;iT,inferiorturbinate.
Fig.4.2a–dImmunohistochemicalfeaturesofthehumanvomeronasalduct(VND).
aHumanVNDduringdelevopment,approximatelyweek8.Immunohistochemicalreactionwithanantibodyagainstproteingeneproduct9.5
(black reaction product; PGP 9.5) shows clusters of immunopositive ganglion cells (outwandered epithelial cells; smallarrows) and the
vomeronasalnerve(orterminalnerve?)closetothevomeronasalduct(largearrows)runningintheseptalmucosa.Olf,olfactorycleft,lined
withPGP9.5–immunoreactiveolfactoryepithelium;Se,nasalseptum(cartilage).Scalebar:200µm.
bIncomparison,afrontal sectionofthenasalseptumina newbornratreactedwith anantibodyagainstolfactorymarkerprotein(brownish
reactionproduct;OMP).Thecrescent-shapedvomeronasalductexhibits alateralnonsensoryand a medialsensory epithelium. Thelatter
possesses twolevelsofOMP-positive cells,superficiallyand basallylocated. Theyprojecttodifferentregionsin the accessoryolfactory
bulb.Scalebar:200µm.
c Detail of the developinghuman vomeronasal duct from (a). PGP 9.5–immunoreactive cells with dendritic processes (arrowheads) and
cluster-likeformationofganglioncellsinthelaminapropria(arrows)showsstructuralprerequisitesforprenatalfunction.
dVomeronasalepitheliuminanagedhumanvomero-nasalductafterautopsy.Theimmunoreactivityagainstcaveolin1,anintegralmembrane
proteininvolvedinreceptor-independentendocytosis,showsslender,bipolar,neuron-likecells(arrowheads),butneverreactivitytoclassical
neuron markers. This mirrors the somewhat enigmatic nature of this apparently highly specialized epithelium. Counterstain with
haematoxylin.Scalebar:10µm.
Regression
Usuallytheconnectionoftheneuroepitheliumwithcentralnervoussystemstructuresdegeneratesbefore
week28.ThereareafewreportsofthepersistenceofthevomeronasalnerveandappropriateG
o
-andG
i
-
positive epithelialcells until the latefetalperiod,
18
but, lackingotherimportantcomponents, these are
probably not functional. The vomeronasal nerve has been described as present until the sixth fetal
month,
19
 and “vestigial remains” were inconsistently observed until week 18.5.
16
 The closure of the
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vomeronasalductwasinterpretedasasignof“degeneration,”
20
but,inmostindividuals,theductremains
opentodifferentextents(seebelow).However,thetimingofdisconnectionofthenervefromepithelial
cellshasnotyetbeendescribed.
MostVomeronasalOrgan–relatedStructureshaveDisappearedinAdultHumans
MostconstituentsoftheVNOarenolongerdetectableatbirthinhumans.Theonlyremainingstructureis
theVND,whichexhibitsconsiderablevariabilityinshape,size,andevenpresenceordetectability.The
VNDissituatedsuperiortotheparaseptalcartilageandrunssmoothlycraniodorsally.Theopeningofthe
VND is less than 2 mm in diameter, sometimes pigmented a brownishyellow (Fig. 4.2). Generally
describedasablind-endingductoramucosalpouchlocatedintheanteriornasalseptum,itslengthvaries
between3and22mm.
17
Thefrequencyofdetectiondependsstrongly onthe techniqueofinvestigation:
histological studiesreveal a higher percentageofVNDsthanrhinoscopic orendoscopicinvestigations
(Table4.1).
29
Unlikeinrodents,thereisnodifferencebetweenthetwosidesoftheductwithregardtoa
possible “sensory” and “nonsensory” epithelium. Histologically, the epithelium of the VND contains
portionsofsensory-likeformations,butneuronalmarkersarenolongerexpressed,andnorarethereany
nerveterminalsleftinthevicinityoftheepithelium.
30
Takentogether,thevomeronasalepitheliumofthe
adulthumanVNDexpresseshighlyspecializedhistochemicalfeatures;however,itdoesnotprovidethe
essential requirements for classical neuroepithelial information transfer into the brain. Owing to its
exposedlocationintheanteriorseptum,theVNDcaneasilybedamagedduringnasoseptalororthognatic
surgery.Despiteoccasionalanecdotalreportsandspeculation(e.g.,FoltánandSedý2009
31
),thereareno
studiesthatprovidemeasurablefunctionalevidencethatVNDdamageleadstobehavioralchangesafter
nasoseptalsurgery.
EvidenceForandAgainstaFunctioningHumanVomeronasalOrgan
AreThereHumanPheromones?
Chemical compounds that convey informationfrom one individual to another of the samespecies are
commonly called pheromones. By original definition (notably in insects which lack a morphological
VNO),theseare,“substanceswhicharesecretedtotheoutsidebyanindividualandreceivedbyasecond
individualofthesamespecies,inwhichtheyreleaseaspecificreaction,e.g.,adefinitebehaviourora
developmentalprocess.”
32
Themediationofchemosensorysignalsinsocialandsexualbehaviorhasbeen
widelydocumentedin animals.
33
 A similar function seems likely in humans but has been less widely
documented(reviewedbyGrammeretal2005
34
):
• Meredith
35
 proposes restricting the definition for pheromoneby including a requirement for mutual
benefit to sender and receiver, putting pheromone communication in an evolutionary context. The
communicationfunction, ifany,forexample ofhumanodor response,isobscure,sothese wouldnot
necessarilymeetthemorerestrictivedefinitionforpheromonecommunication.However,thisscientific
definitionis not universallyaccepted andthe term pheromoneis usedloosely inboth scientific and
popularpublications.
Table 4.1Frequencyofvomeronasalductinadulthumansvariesaccordingtotheinvestigationtechnique
Reference N Frequency
Potiquet1891
21
200 25%
Johnsonetal1985
22
100
Patients39%(endoscopy)
Postmortemspecimens70%(histology)
Stensaasetal1991
23
410 93%
Moranetal1991
24
200 100%bilateral
Garcia-VelascoandMondragon1991
25
1,000 90%
Trotieretal2000
26
1,842 Patients26%(endoscopy)
Gaafaretal1998
27
200 Patients76%(endoscopy)
Wonetal2000
28
78 36%
Knechtetal2001
29
173 65%(41%bilateral,24%unilateral;endoscopy)
Wittetal2002
30
25 65%(histology)
• The chemical nature of proposed pheromone compounds is heterogeneous, but some pheromone
candidatesin humans andanimalsmaybechemically related.
36
Possibleproduction sitesforhuman
pheromonecandidatesincludeurine,smegma-producingurogenitalglands,lachrymalglands,
37
axillary
apocrineglands,andmammaryglands,
38
mirroringknownpheromonesourcesinanimals.
•Theremayalsobesimilaritiesintherelationshipbetweencomplex“odorprints”andcomponentsofthe
immunesystemthat conferindividualidentity(e.g.,human lymphocyteantigens[HLA],or therodent
majorhistocompatibilitycomplex).
39
Peoplehavebeenshownto be capableofidentifying odors of
closelyrelatedpersons(fromsamplesofaxillaryvolatilescollectedfromT-shirts)betterthanwould
be expected by chance alone.
40
 Thus, there could be “signaler pheromones” that help individuals
recognize relatives. There is also some evidence for a physiological response that varies with the
reproductivecycleoffemaleodordonors,includingmodulationofthemenstrualcycleinotherwomen
andanincreaseintestosteroneinmen.
41,42
Theunidentifiedcompoundsinvolvedmaybeclassifiedas
“primerpheromones,”producing an endocrineresponse and(maybe) a delayedchangeinbehavior.
Less convincingly, pheromones representing paternally inherited HLA alleles may influence mate
choice.
43,44
•Inhumans,activationofthehypothalamusbysomeodorsissexuallydimorphic(andsexualorientation–
specific)inbrainimagingstudies,
45
butevidencesuggeststhatthedetectionofsuch odorsis viathe
mainolfactorysystem,notthevomeronasalorganorVND.
PheromonesarenotNecessarilyDetectedbytheVomeronasalOrgan
Innocaseofproposedhumanpheromonecommunicationhasadirectspecificligand–receptorinteraction
involvingvomeronasalorolfactorychemosensorycellsandtheirregulartransductionmechanismsbeen
shown.Casesinwhichthevomeronasalsystemwasthoughttobeinvolvedhavenotbeensupportedby
subsequentsystematicinvestigation(seebelow).Chemosensorydetectionmustinvolvealigand–receptor
interactionofsomekind,butthereisnocompellingevidencethatthisoccursinthedistincthumanVND
ratherthanintheolfactoryepithelium,orelsewhere.
•Althoughthereisnouniversallyaccepteddefinitionof“pheromone,”itisclearthatsomechemosensory
communicationsignalsinanimals,whichwouldbepheromonesbyalmostanydefinition,aredetected
bythemainolfactorysystemandnotthevomeronasalsystem.
46,47
Forexample,innewbornrabbits,a
moleculesecretedbylactatingfemales,the“mammarypheromone,”triggersorofacialresponsesinthe
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pupsthathelpthemlocatethenipples.
48
Interestingly,thesechemosensorycuesarelearnedprenatally
viathemainolfactorysystem,emphasizingthefunctionalityofchemosensoryorgansbeforebirth.Thus,
theideathatafunctionalVNOisnecessaryforpheromonecommunicationiscontradictedbyavailable
data.EquallyerroneousistheideathatasubstancestimulatingtheVNOmustbeapheromone.
EvidenceAgainstHumanVomeronasalOrganFunction
Pheromone-like communication in humans probably exists, but a vomeronasal system is not
necessary.
Allwell-studiedcasesofvomeronasalfunctioninothervertebratesrequirethepresenceofspecifictypes
ofsensoryneuronexpressingcertainstimulus-receptorand-transductionproteins,andpossessingneural
connections capable of transmitting sensory information to the brain. Humans lack many of these
requirements:
• Mostof the genes encoding the vomeronasal receptors belong to theV1R and V2Rfamilies but, in
humans, therearenoV2Rgenes
49
and95%ofall V1Rgenes are pseudogenes(i.e.,cannotproduce
normal functional proteins).
50
 (The remaining V1R genes are discussed below.) Evidence from
knockoutanimalssuggeststhattheTRPC2transductionchannelprotein(productofthetrpc2gene) is
critical fornormal VNO function in animals. The human trpc2 gene is also a nonprotein-producing
pseudogene.
51
 Formyl-peptide receptors (FPR) are alternative chemosensory receptors in rodent
VNOs
52
butare notexpressedinchemosensoryepitheliaofnonrodentmammals.HumanVNDtissue
has notbeentested for the presence of FPRs, but itlacks the vomeronasal bipolar sensorycells in
whichV1R,V2R,andFPRsarenormallyexpressed.
• In addition to lacking cellular components such as bipolar neurons, humans have no demonstrable
vomeronasal nerve to carry sensory information to the brain, and no AOB, the brain region that
normallyreceivesvomeronasalsensoryinput.
•Electrophysiological experiments
53,54
andpositronemissiontomography(PET)studies
55
showed that
subjectswith or withouta detectable VND, or withtheir VNDcovered, did notdiffer in olfactory
sensitivity or odor threshold for androstenone or androstadienone (previously proposed as human
pheromones)orotherodors.
Chemical communication involving chemosensory transduction via the classical vomeronasal
sensorypathwayorviaotherchemosensorypathwaysinthevicinityofthehumanvomeronasalduct
isunlikely.
EvidenceForPossibleHumanVomeronasalOrgan/VomeronasalDuctFunction
• Although humans lackmost structures required for normal vomeronasal function, they do retainfive
remnantV1Rgeneswithopenreadingframes,
56
andcouldpotentiallyproducehumanV1R-like(hV1R-
L)receptorproteins.Inarecentstudy,allfivecouldfacilitateactivationoftheGα
o
signalpathwayin
culturedHeLa/olfcellsinvitro.
57
•Theabsence ofa functionaltrpc2 gene inhumansdoes notabsolutely rule outsome VNOfunction.
Residual function remains in mice with trpc2 knocked out,
58
 so some noncanonical transduction
mechanismcouldallowVR-typereceptorstofunction—butthereisnoevidencefortheirexpressionin
thehumanVND.
•Expression ofonehumanVRgene(hV1R-L1) isreportedinhumanmainolfactory epithelium,
56
 but
thereisnoevidencefordisplacedvomeronasal-typesensoryneuronsthere.Ifexpressedinolfactory
sensoryneurons(notdemonstrated),withacompatibletransductionpathway,thenhumanV1Rsmight
behave like olfactory receptors. They could contribute to the regular sense of smell or, with
appropriate central connections, they could contribute to pheromone communication. But this is all
speculation:thereisnoevidencethathV1R-L1hasachemosensoryfunctionofanykind,inolfactory
epitheliumorintheVND.
• Monti Bloch and colleagues
59
 reported a sexually dimorphic electrophysiological response to
androstadienone (inwomen) andestratetraenol (in men), recorded from the regionofthe VND and
associatedwithanunconsciousautonomicresponse.Theycalledthesesubstancesandrelatedsteroids
“vomeropherins,”andclaimedtheyweremaleandfemalehumanpheromones,respectively,basedona
mistakenbeliefthatsubstancesstimulatingaVNOmustbepheromones.Thesefindingshavenotbeen
supported by later electrophysiological and PET studies (see above). There has also been no
confirmationofspecificelectrophysiologicalresponsesto“vomeropherins”incellsisolatedfromthe
humanVND.
60
• The recent discovery of a previously unknown vomeronasal receptor family (see above), and the
existenceofsomeVNOchemosensoryfunctionintheabsenceofTRPC2,leavesopenthepossibility
thattheremaybeotherVNOsensorymechanisms.VRreceptorgenesdifferwidelyacrosstaxonomic
groups, perhaps helping to maintain species isolation.
49
 Some mammals, including the nonhuman
primatemarmosets,lackfunctionalversionsofallknownvomeronasalreceptorgenes,V1R,V2R,and
FPR,buttheydohaveaclassicalVNO,which,inarelatedspecies,appearstobefunctional.
61
Thus,
there may be vomeronasal receptors yetto be discovered, but they are unlikelytobe the basis for
chemosensoryfunctioninthehumanVND,becauseotheressentialcomponentsaremissing.
Trigeminalreceptorsmaycontributetoodorperception.
•TherearenoclassicalvomeronasalsensoryneuronsinorneartheVNDinadulthumans—buttheremay
beotherchemosensorycells.Thetrigeminalnerveinnervatessolitarychemosensorycellsinthenasal
mucosa,whichexpresssignaltransductioncomponentscommontobotholfactoryandtastesystems
62
andrespondtoodorsathighconcentrations.Trigeminalchemoreceptorsinthenasalcavityprimarily
servetodetectirritantsandtriggerprotectivereflexes(e.g.,sneezing),buttheycanalsocontributeto
odor perception. Solitary chemoreceptor cells cluster in and around the VND in mice,
63
 but their
presenceanddistributionaroundthehumanVNDisunknown.
ChemicalCommunicationviaVomeronasalOrgan–orVomeronasalDuct–
independentPathways
ThereisapossibilityofchemosensorycommunicationviaVNO-independentpathways.Themostlikely
pathway,ofcourse,isthemainolfactorysystem.Trigeminalorotherpotentialchemoreceptorsofthenose
(e.g.,Grünebergganglionornervusterminalis)
62
arealsopossible(butunlikely)contributors.Inaddition,
chemical compounds could diffuse into blood vessels in the nose or airways, or after ingestion, for
detection by (undefined) internal chemoreceptors.
64
 There are no prominent capillaries close to the
VND,
30
sothisisnotalikelyVND-relatedmechanism.
• There is no reason that the main olfactory system could not mediate all human chemosensory
communicationeventhoughothermammalsdependinpartontheir vomeronasal systems. Unlearned
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communication signals require the identification of particular molecules, which the vomeronasal
system achieves via receptors with highly selective responses. Most main olfactory receptors are
relativelynonspecific,butthemammalianbrainshouldbeabletosolvethecomputationalproblemof
identifying molecules via combinations of input, even if there are no specific olfactory pheromone
receptors.Inthe vomeronasalsystem,informationpassesdirectly totheamygdala,partofthebrain's
limbicsystemimplicatedinunlearnedresponsestopheromones.Themainolfactory systemalso has
projectionstolimbiccircuits,includingtheamygdala,inprimatesandothermammals.
65
• Because vomeronasal input was thought to be essential for pheromone response, and because the
amygdala has relatively indirect pathways to the neocortex, some have proposed
59
 that response
without conscious perception would be the hallmark of pheromone communication—but the initial
assumptionisnowknowntobeincorrect.Consciousdetectionofthestimulusisnotincompatiblewith
pheromone communication, although it may be independent and unnecessary for pheromone
communication.
• The most common (canonical) type of olfactory transduction pathway is via olfactory receptor
activation of adenylyl cyclase III to produce cyclic adenosine monophosphate, which opens cyclic
nucleotide–gated channels. However, several other olfactory transduction pathways that use either
conventional or nonconventional (noncanonical) olfactory receptor molecules are now knownto be
expressedinsmallsubsetsofmainolfactorysensoryneurons.Thus,anodorresponseintheabsenceof
the canonical olfactory transduction pathway
66
 does not necessarily implicate involvement of
vomeronasal receptors. Ironically,some ofthese specializedolfactory receptorneurons(ORNs)use
thephospholipidtransductioncascadenormallyactivatedbyvomeronasalreceptors,butvomeronasal
receptormoleculesarenotknowntobeexpressedinanyofthem.OneofthesmallsubgroupsofORN
that uses a noncanonical transduction pathway andexpresses the TRPM5 transduction channel does
projectitsaxons to theventral olfactory bulb, whereprojectionstolimbiccircuits mayoriginatein
mice,
67
andthereisevidenceforalimbicprojectionfromtheseparticularneurons.
68
• Recently, an olfactory receptor (OR7D4) has been found to be activated by steroid-derived odors,
including androstenoneandandrostadienone.
69
 The associated geneis intact inhumans and may be
responsibleforhumanbehavioralandphysiologicalresponsestovolatilesteroidspreviouslyattributed
toVNOfunction(seeabove).
Summary
Thereisreasonablyconvincingevidenceforchemosensorycommunicationinhumans.Whetheritis
learnedorunlearnedisnotclearinallcases,butitismorelikelytobeaccomplishedbythemain
olfactorysystemthananychemosensorysystemlocatedinorneartheVND.
OutlookandPracticalAdviceforPhysicians
•ThedetectabilityoftheVNDbyendoscopyvariesconsiderablyfromonedaytoanother,asitcanbe
obstructedbymucusorperiodicswelling ofthenasalmucosa.However,evenwhen thepresenceof
VND(s)canbeestablished,thisisunlikelytobehelpfulwithdiagnosisofchemosensoryorbehavioral
disorders.
•Occasionally,aVNDorificecanbemisinterpretedasa(rarely)persistentnasopalatineduct(NPD),a
communication between the oral and nasal cavities that usually closes at birth or at the latest in
childhood.
70
 If any NPD is detectable, the opening is located at thenasal floor,whereas theVND
orificeislocatedmoreposteriorly~1to2mmabovethenasalfloor.
•Patientsshouldbereassuredthatthebestscientificevidenceindicatesthatdamageormalfunctionofthe
VNO/VNDisunlikelytobeacontributortoanyadversesymptomstheyareexperiencing.
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