Understanding anatomy of male external genitalia in human

1. Male external genitalMale external genital
organorgan
ByBy
Dr shittu LAJDr shittu LAJ

3. Male external genitaliaMale external genitalia
 ScrotumScrotum
 PenisPenis
 urethraurethra

4. 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

5. 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.

6. 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.

7.  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.

8. 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.

9. 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

10.  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.

11. 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