Ukujula
Ukujula ukudedelwa kwesidoda (the ejaculate; ngokuvamile aqukethe isidoda ) kusukela besilisa ipheshana reproductory ngenxa i orgasm.Kuyinto esigabeni sokugcina futhi umgomo zemvelo besilisa ukushukuma ngokobulili, futhi isakhi esibalulekile zemvelo nje ebamba isisu . Ezimweni ezingavamile, ukuphuma kwe-ejaculation kwenzeka ngenxa yesifo se-prostatic.Ukujula kungenzeka futhi ngokuzenzekelayo ngesikhathi sokulala ( ukuphuma kobusuku noma "iphupho elimanzi").Ukweqa ngokweqile yisimo sokungakwazi ukukhipha i-ejaculate.Ukukhishwa kwe-ejaculation kuvame ukujabulisa kakhulu amadoda; i-dysejaculation i-ejaculation ebuhlungu noma engathandeki.Ukujikisa kabusha kwe-Retrograde yisimo lapho isidoda sihamba sibuyela emuva esinyeni kunokukhipha i- urethra .
Izigaba
[hlela | Hlela umthombo]Ukugqugquzela
[hlela | Hlela umthombo]Ukujula ngaphambi kwesikhathi yilapho ukukhishwa kwe-ejaculation kwenzeka ngaphambi kwesikhathi osifunayo.Uma owesilisa engakwazi ukukhipha umuthi ngesikhathi esifanele ngemuva kokuvuselelwa ngokocansi isikhathi eside, naphezu kwesifiso sakhe sokwenza lokho, kubizwa ukubambezeleka kwe-ejaculation noma i- anorgasmia .I-orgasm engahambisani ne-ejaculation yaziwa njenge- orgasm eyomile .
Ikhwalithi
[hlela | Hlela umthombo]Inombolo yesidoda ku-ejaculation nayo iyahlukahluka kakhulu, kuya ngezici eziningi, kufaka phakathi isikhathi kusukela ku-ejaculation yokugcina,ubudala, amazinga okuxineka, ne- testosterone.Ubude obukhulu besikhuthazo sobulili ngokushesha okwandulelayo kwe-ejaculation kungaholela ekugxileni okuphezulu kwesidoda. [1]Isibalo sesidoda esiphansi ngokungajwayelekile, asifani nevolumu yesilisa ephansi, saziwa njenge- oligospermia, futhi ukungabi bikho kwanoma yisiphi isidoda esisuka kwisidoda kubizwa ngokuthi yi-azoospermia.
Intuthuko
[hlela | Hlela umthombo]Ngesikhathi sokuthomba
[hlela | Hlela umthombo]
Ukujula kokuqala kwabesilisa kuvame ukwenzeka cishe ezinyangeni eziyi-12 ngemuva kokuqala kokuthomba, imvamisa ngokushaya indlwabu noma ukuphuma ebusuku (amaphupho anamanzi).Leli volumu lokuqala lesidoda lincane.Ukujula okujwayelekile ezinyangeni ezintathu ezilandelayo kuveza okungaphansi kwe-1 ml yesidoda. Isidoda esikhiqizwa ngesikhathi sokuthomba sibuye sicace ngokujwayelekile.Ngemuva kokukhishwa kwesidoda lesi sidoda sokuqala sihlala sifana nejeli futhi, ngokungafani nesidoda esivela emadodeni avuthiwe, sehluleka ukuncibilika.Isifinyezo sokukhula kwesidoda siboniswa kuThebula 1.
Ama-ejaculations amaningi okuqala (amaphesenti angama-90) awanaso isidoda.Kuma-ejaculation ambalwa okuqala aqukethe isidoda, iningi lesidoda (i-97%) liswela ukunyakaza. Isidoda esisele (3%) sinokunyakaza okungajwayelekile. [2]
Njengoba owesilisa eqhubeka nokuthomba, isidoda sakha izici ezivuthiwe ngobuningi obukhulayo besidoda esijwayelekile.Isidoda sikhiqize izinyanga eziyi-12 kuya kwezingu-14 ngemuva kokuqala kokukhishwa kwe-ejaculation ngemuva kwesikhathi esifushane.Kungakapheli izinyanga ezingama-24 kwe-ejaculation yokuqala, ivolumu yesidoda nobungako nezimpawu zesidoda kufana nokwedoda endala. [2]
| Isikhathi ngemuva kokuqala </br> ukuphuma (izinyanga) |
Ivolumu emaphakathi </br> (amamililitha) |
Uketshezi | Ukuhlungwa kwesidoda esimaphakathi </br> (isigidigidi sesidoda / semililitha) |
|---|---|---|---|
| 0 | 0.5 | Cha a | 0 |
| 6 | 1.0 | Cha a | 20 |
| 12 | 2.5 | Cha / Yebo b | 50 |
| 18 | 3.0 | Yebo c | 70 |
| 24 | 3.5 | Yebo c | 300 |
Lawula kusuka ohlelweni oluphakathi lwezinzwa
[hlela | Hlela umthombo]Kukhona i- generator yephethini emaphakathi entanjeni yomgogodla, eyenziwe ngamaqembu ama- interneuron womgogodla, okubandakanyeka ekuphenduleni kwesigqi kwe-ejaculation. Lokhu kwaziwa njenge- generator yomgogodla we-ejaculation . [3]
Ukwenza imephu yokusebenza kwe-neuronal kobuchopho ngesikhathi sokuphendula okujula, abacwaningi bafunde ukubonakaliswa kwe- c-Fos, iproto-oncogene evezwe kuma-neuron ngokuphendula ukukhuthazwa ngamahomoni nama-neurotransmitters. [4]Ukuchazwa kwe-c-Fos ezindaweni ezilandelayo kuye kwabonwa: [5] [6]
- indawo yangaphambi kokuphamba (MPOA)
- i-lateral septum, i-nucleus yombhede ye- stria terminalis
- i-nucleus ebonakalayo ye-hypothalamus (PVN)
- i-ventromedial hypothalamus, i- amygdala yangaphakathi
- i-ventral premammillary nuclei
- i-ventral tegmentum
- inkambu tegmental maphakathi
- i-mesencephalic grey emaphakathi
- i-peripeduncular nuclei
- i-parvocellular subparafascicular nucleus (SPF) ngaphakathi kwe- thalamus engemuva
Ukuchama okungenazandla
[hlela | Hlela umthombo]Yize kungavamile, amanye amadoda angafeza ama-ejaculation ngesikhathi sokushaya indlwabu ngaphandle kokuvuselelwa okwenziwa ngesandla.Amadoda anjalo ajwayele ukukwenza ngokugoqa nokuguquguqula imisipha yabo yesisu neyezinqe kanye nokucabanga ngamandla.Abanye bangakwenza ngokuxegisa indawo ezungeze ipipi, okungaholela ekuvinjweni okunzima ikakhulukazi uma kufakwe umfutho. [7]
Ukucindezela kwe-Perineum nokubuyisa kabusha i-ejaculation
[hlela | Hlela umthombo]Ukucindezela kwe-Perineum kuholela ekujuleni okubanjelwe emuva ngokucindezela i-perineum noma i-urethra ukuphoqa uketshezi lwesisu ukuba luhlale ngaphakathi.Esimweni esinjalo, uketshezi lwesisu luhlala ngaphakathi emzimbeni luye kwesinye.Abanye abantu bakwenza lokhu ukugwema ukwenza ukungcola ngokugcina sonke isidoda ngaphakathi. [8]Njengesimo sezokwelapha, kubizwa ngokuthi yi- retrograde ejaculation . [9]
Ezinye izilwane
[hlela | Hlela umthombo]Ezilwaneni ezincelisayo nezinyoni, ukujula okuningi kuvamile.Ngesikhathi sokucobelelana, izinhlangothi zombili zomthondo ka-echidna onemilomo emifushane zisetshenziswa ngokulandelana.Ukushintshana phakathi kwezinhlangothi zombili kuvumela ukukhuthazwa okuqhubekayo ukwenza i-ejaculation ngaphandle kokuvimbela isikhathi sokuphikisa. [10]
Ezingxenyeni ezinkulu zamahhashi, ukujula kuhambisana nokunyakaza komsila okwaziwa nge- "flag flagging".Lapho impisi yesilisa ikhipha umjelo, amandla ayo okugcina okhalo angase abe made.Inkawu i-rhesus eyesilisa ivame ukukhipha imisipha engaphansi kwemizuzwana eyi-15 ngemuva kokungena ngokocansi .Umbiko wokuqala nemidwebo yokuchichima okuzenzakalela esilwaneni esincelisayo sasemanzini yaqoshwa ehlelweni lasendle i-Indo-Pacific dolphin eduze naseMikura Island, eJapan, ngo-2012. [11]
Emahhashini, ezimvwini nasezinkomeni, ukukhishwa kwesisu kwenzeka emizuzwaneni embalwa, kepha ezingulubeni, kungathatha imizuzu emihlanu kuya kwamashumi amathathu .Ukujula kwezingulube kuyakhuthazeka lapho umthondo omise okokuhlangana ungena nomlomo wesibeletho sowesifazane.Ingulube evuthiwe ingaveza yesidoda ngesikhathi esisodwa.Ku-llamas kanye ne-alpaca, i-ejaculation yenzeka ngokuqhubekayo ngesikhathi sokuhlangana.
Isidoda sezinja zesilisa sikhishwa ngezigaba ezintathu ezihlukene.Isigaba sokugcina sokuphuma kwe-canine wesilisa senzeka ngesikhathi sethayi yokukopisha, futhi siqukethe kakhulu uketshezi lwe-prostatic.
- ↑ Pound, N. (2002). Duration of sexual arousal predicts semen parameters for masturbatory ejaculates.
- ↑ 2.0 2.1 Janczewski, Z. (1985). Semen Characteristics in Pubertal Boys.
- ↑ Guertin (2012). Central pattern generator for locomotion: anatomical, physiological, and pathophysiological considerations..
- ↑ Sagar, S.M. (1988). "Expression of c-fos protein in brain: metabolic mapping at the cellular level". Science 240 (4857): 1328–1332. Bibcode 1988Sci...240.1328S. doi:10.1126/science.3131879. PMID 3131879.
- ↑ Pfaus, J.G. (1997). "Implications of immediate-early gene induction in the brain following sexual stimulation of female and male rodents". Brain Res Bull 44 (4): 397–407. doi:10.1016/S0361-9230(97)00219-0. PMID 9370204.
- ↑ Veening, J.G. (1998). "Neural activation following sexual behavior in the male and female rat brain". Behav Brain Res 92 (2): 181–193. doi:10.1016/S0166-4328(97)00190-3. PMID 9638960.
- ↑ The Rough Guide to Sex retrieved February 2012
- ↑ 65+ --Gateway to Sexual Adventure: For Women and Men, Herb Hirata - 2012
- ↑ Andrology: Male Reproductive Health and Dysfunction - Page 317, E. Nieschlag, Hermann M. Behre, Susan Nieschlag - 2010
- ↑ Johnston, S.D. (2007). One-Sided Ejaculation of Echidna Sperm Bundles (Tachyglossus aculeatus). Archived from the original on 2021-10-02. https://web.archive.org/web/20211002234419/https://eprints.qut.edu.au/14228/1/14228.pdf. Retrieved 2021-10-02.
- ↑ Morisaka, Tadamichi. Spontaneous Ejaculation in a Wild Indo-Pacific Bottlenose Dolphin (Tursiops aduncus).