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Anatomy of male external genitalia

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Understanding anatomy of male external genitalia in human

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Anatomy of male external genitalia

  1. 1. Male external genitalMale external genital organorgan ByBy Dr shittu LAJDr shittu LAJ
  2. 2. Male external genitaliaMale external genitalia  ScrotumScrotum  PenisPenis  urethraurethra
  3. 3. scrotumscrotum  Two cut. Outpouching of ant. Abd.Two cut. Outpouching of ant. Abd. wall/pendulous cut. Pouch-labioscrotalwall/pendulous cut. Pouch-labioscrotal swelling.swelling.  Two layers-skin & superf. FasciaTwo layers-skin & superf. Fascia  Two equal halves by a long. MedianTwo equal halves by a long. Median scrotal raphe.scrotal raphe.  Divide into Rt and Lt. compartment-Divide into Rt and Lt. compartment- septum(dartos Ms and superf.) which isseptum(dartos Ms and superf.) which is incomplete supeiorly.incomplete supeiorly.  Outer surface-two parts, Rt. And Lt.Outer surface-two parts, Rt. And Lt.  Houses two structures-Testes andHouses two structures-Testes and spermatic cordsspermatic cords
  4. 4. Skin & superficial layerSkin & superficial layer skinskin  ThinThin  Pigmented/dark colouredPigmented/dark coloured  Rugose/wrinkleRugose/wrinkle  Rich sebaceous glands.Rich sebaceous glands. Superficial layer- two parts; ant-continuousSuperficial layer- two parts; ant-continuous with Memb.deep layer of ant. Abd. Wall &with Memb.deep layer of ant. Abd. Wall & post.- superficial perineal fascia.post.- superficial perineal fascia.  No subcutaneous fatNo subcutaneous fat  Contains involuntary dartos muscles (thinContains involuntary dartos muscles (thin sheath of muscles)-rigosity of skin.sheath of muscles)-rigosity of skin.
  5. 5. Neuro-vascular supplyNeuro-vascular supply Blood supply-skin &Blood supply-skin & dartos Msdartos Ms 1. perineal br.of1. perineal br.of InternalInternal pudendalpudendal art. Andart. And Extenal pudendalExtenal pudendal art.art. 2. Test. Art and2. Test. Art and Cremasteric art.Cremasteric art. (Of(Of Inf. EpigasticInf. Epigastic art)art)..  The scrotal veinsThe scrotal veins follow the art.follow the art.  Ext. pudendalExt. pudendal vein drains intovein drains into greatgreat saphenoussaphenous vein.vein.
  6. 6.  ant-lat (sensory)-ant-lat (sensory)- genital br.ofgenital br.of genito-genito- femoral(L1) +femoral(L1) +  Ilio-inguinal NnIlio-inguinal Nn (L1)-ant.(L1)-ant.  Post.-Post.- peineal br.peineal br. OfOf a. pudendal Nn anda. pudendal Nn and  b. post. Femoral cut.b. post. Femoral cut. NnNn  Lymph. Vessels withinLymph. Vessels within the superficial fasciathe superficial fascia and drain intoand drain into superf.superf. Inguinal LN.Inguinal LN.
  7. 7. urethraurethra  8`` / 20cm long8`` / 20cm long  S-shaped curveS-shaped curve  Begins at bladder neck & opens atBegins at bladder neck & opens at ext.meatus.ext.meatus.  3 parts-proststic;3 parts-proststic; membranous/penile.membranous/penile.
  8. 8. penispenis  RootRoot  BodyBody  GlansGlans  Corpus spongiosumCorpus spongiosum  Suspensory lig. Of penisSuspensory lig. Of penis  Fascia of penis (deep-buck`s fascia)Fascia of penis (deep-buck`s fascia)  Prepuce.Prepuce.  MusclesMuscles-Bulbo-spongious & Ischio--Bulbo-spongious & Ischio- cavernouscavernous
  9. 9.  Prostatic urethProstatic ureth..  ~ 3cm/1.25`` long~ 3cm/1.25`` long  Widest and most dilatableWidest and most dilatable  Begins at bladder neckBegins at bladder neck tranverses through entiretranverses through entire prostate & ends at upperprostate & ends at upper fascia of Urogenitalfascia of Urogenital Diaph.Diaph.  Post.Post. Wall-urethralWall-urethral crest(prominentcrest(prominent longlong ridge)ridge)  Colliculus-Colliculus-summitssummits where ejaculatory ductswhere ejaculatory ducts openopen  Proststic sinusesProststic sinuses -gutter on side of crest.-gutter on side of crest.  Memb. UrethtralMemb. Urethtral  Shortest-1-2cmShortest-1-2cm  ThinnestThinnest  Least dilatableLeast dilatable  Extends lower fascia ofExtends lower fascia of Urogenital DiapUrogenital Diap  Surrounded by sphincterSurrounded by sphincter urethrae (striated Ms)urethrae (striated Ms)  Penile/spongy UrethralPenile/spongy Urethral  Longest part-15-16cmLongest part-15-16cm  Embedded inEmbedded in corpus spongcorpus spong..  Make up part of erectile tissueMake up part of erectile tissue of penisof penis  Intrabulba fossa(at the bulb)Intrabulba fossa(at the bulb)  fossa navicularisfossa navicularis (at glans(at glans penis)penis)  Ext. meatusExt. meatus –narrowest part–narrowest part  Mucus seceting uthral galansMucus seceting uthral galans numerous on dorsal suface ofnumerous on dorsal suface of spongy urethral.spongy urethral.
  10. 10. Neuro-vascular of urethraNeuro-vascular of urethra  B/sB/s  Int. pudendalInt. pudendal art.art.  ProstateProstate  Art. to bulb andArt. to bulb and urethralurethral  Vein follows art.Vein follows art.  Inf. HypogstricInf. Hypogstric plexus-prostasticplexus-prostastic plexusplexus  Afferent nerve-Afferent nerve- Pelvic splanchnicPelvic splanchnic plexusplexus  Pudendal NnPudendal Nn

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