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Penis
covered by sup/deep fascia of penis
  • b/w the 2 fascia = dorsal cutaneous v
  • below = dorsal v in midline, L & R dorsal a lat to it, and most lat is dorsal n

General Info:

  • held in back to perineal body (w/ bulbospongiosus m)
  • goes through perineal membrane
  • lat = fibromuscular tissue = triangular shape
  • Function: sexual intercourse, urination
Fascia and Ligaments of Penis:
  • Fundiform lig – from linea alba & membranous layer of sup fascia of abdomen –> splits into L& R parts –> encircles body of penis –> blends w/ superficial penile fascia –> scrotum septum
  • Suspensory lig of penis – pubis symphysis and arcuate pubic lig –> deep fascia of penis or body of clitoris
    • lies deep to fundiform lig
  • Deep fascia of penis (Buck’s fascia) – continuation of deep perineal fascia, cont w/ fascia covering ext oblique m & rectus sheath
  • Tunica albuginea – dense fibrous layer that envelopes both corpora cavernosa & corpus spongiosum
    • very dense around corpus cavernosa –> impede venous return & result in extreme rigidity of structures when erectile tissue become engorged w. blood
    • more elastic around spongiosum, therefore not turgid during erection, permist passage of ejaculate
  • Tunica vaginalis – double serous membrane, peritoneal sac @ end of process vaginalis
    • covers front and sides of testis and epididymis
    • closed sac derived from ab peritoneum, forming innermost layer of scrotum
    • parietal layer = adjacent to int spermatic fascia
    • visceral layer = adherent to testis & epididymis
Parts:
1. Root
inf ramus of pubis (crus) –> midline of UG diaphragm (bulb) –> penile urethra
located in superficial perineal pouch, b/w perineal membrane sup, and deep perineal fascia inf
Crus of penis = covered by ischiocavernosus m
Bulb of penis = covered by bulbospongiosus m

* More info on these musc/structures will be covered in male perineum
2. Body (shaft)
3 cavernosus bodies:
2 corpus cavernosa
1 corpus spongiosum

has very little muscular fibers in this part
has thin skin, CT, blood & lymph vessles, fascia and the corpora
fill w/ blood during sexual excitement –> erection
Each cavernous body has strong fibrous CT capsule = tunic albuginea


Corpus cavernosum:
  • long rod like structures
  • from bulk of penis body
  • fibromuscular tissue
  • Crus of penis lead to corpus cavernosum
  • fuse @ midline
  • contains the deep a of penis
  • tunica albuginea of corpus cavernosa fuse @ midling = form septum penis
Corpus spongiosum:
  • b/w & below carvernosa
  • tunica albuginea thinner & weaker & blends w. tunic of cavernosum
  • carries the urethra
  • bulb leads to corpus spongiosum
  • NEVER hardens! (otherwise, would depress urethra, no ejaculation)
3. Glans:
  • is the head of the penis
  • continous w/ foreskin @ coronal sulcus, and via frenulum
  • sep from body via corona glandis (sulcus) and location of glands that release the pre-ejaculate
  • exit of urethra is on ant tip of glans = vert slit
  • extention of corpus spongiosum, and is therefore also soft in erection
  • covered by foreskin
Blood supply:
  • br of int pudendal a
    • dorsal a – run in space b/w corpora cavernosa, lat to deep dorsal v
    • deep a – peirce crura, run w/in corpora cavernosa
      • supply cavernosus spaces in erectile tissue of corpora cavernosa
      • gives branches called the helicine a
    • a of bulb of penis – supply post corpus spongiosum, bulbourethral gland
  • ext pudendal a - supply penile skin
  • vein drainage
    • dorsal v of penis in deep fascia –> prostatic venous plexus
    • superficially, –> superficial dorsal v –> superficial ext pudendal v or lat pudendal v

Lymph Drainage: superficial lymph nodes

Erection:
  1. Deep a of penis –> br into helicine a, that run radially & open into cavernae
  2. Veins (which drain cavernae) are located in periphery of corpus cavernosum, beside tunica albuginea
  3. Helicine a have special smooth m valves = Ebner’s cushions, usually closed & allows minute amount blood in, drained easily by veins
  4. During sexual excitement, Ebner’s cushions open & blood suddenly flow in and fill up cavernae
  5. Blood influx compresses veins, so no blood is drained = ERECTION
  6. @ end of erection, Ebner’s cushions close, blood flow dec & vein compression release –> cavernae empty
Begins w/ nervous stimulation –> SNS fiber excitation
also involves contraction of bladder sphincter –> so no urine –> urethra and no semen goes into bladder
Bulbospongiosus m –> propelling force of ejaculation
 

BANANAxBOY

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Oct 20, 2005
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I love the visuals for sparking ideas into my head, great post MAXAMEYES! It would be great if people continued to post even more penis diagrams, there is quite a wide veriety of them, and some pictures effect people in different ways.

BxB
 

the1parr

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Feb 8, 2009
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Is there a diagram illustrating the ligs in similar detail. I find it difficult picturing the insertion point.
 
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I'll keep looking.
By the way; feel free to add to the content of this thread.
 

the1parr

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That looks really thick and solid (the lig I mean).
On another note, why is it that most diagrams fail to show th PC muscle. I know it's there and where it is, and i know that there are images out there illustrating it, it's just that it seems kind of illusive?
 
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Well, remember that you're only seeing two dimensions, if I find a good frontal view of the lig I'll post it to better show the actual dimensions.
As far as the PC muscle not being shown...? Who knows why some illustrations show only what they show, I'm bettin' it's because this pic is of "the penis", and they've got some other illustration in another article that shows the PC muscle. Which, in men, is actually the BC muscle-bulbocavernosus, but everybody uses PC ,sooooo....
 
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Turnover

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REDZULU2003

Its a marathon, not a sprint!
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Props to you man, these are really clear quality shots!
 

Turnover

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