MAXAMEYES
12-11-09, 08:41 PM
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
http://www.penishints.com/assets/images/penis-anatomy.jpg
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 (Bucks 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
http://www.mhhe.com/socscience/sex/common/ibank/ibank/0045.jpg
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
http://cdn.channel.aol.com/body/hv/101998
Lymph Drainage: superficial lymph nodes
Erection:
Deep a of penis > br into helicine a, that run radially & open into cavernae
Veins (which drain cavernae) are located in periphery of corpus cavernosum, beside tunica albuginea
Helicine a have special smooth m valves = Ebners cushions, usually closed & allows minute amount blood in, drained easily by veins
During sexual excitement, Ebners cushions open & blood suddenly flow in and fill up cavernae
Blood influx compresses veins, so no blood is drained = ERECTION
@ end of erection, Ebners 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
http://anatomytopics.files.wordpress.com/2009/01/penis-anatomy.jpg?w=720&h=512
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
http://www.penishints.com/assets/images/penis-anatomy.jpg
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 (Bucks 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
http://www.mhhe.com/socscience/sex/common/ibank/ibank/0045.jpg
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
http://cdn.channel.aol.com/body/hv/101998
Lymph Drainage: superficial lymph nodes
Erection:
Deep a of penis > br into helicine a, that run radially & open into cavernae
Veins (which drain cavernae) are located in periphery of corpus cavernosum, beside tunica albuginea
Helicine a have special smooth m valves = Ebners cushions, usually closed & allows minute amount blood in, drained easily by veins
During sexual excitement, Ebners cushions open & blood suddenly flow in and fill up cavernae
Blood influx compresses veins, so no blood is drained = ERECTION
@ end of erection, Ebners 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
http://anatomytopics.files.wordpress.com/2009/01/penis-anatomy.jpg?w=720&h=512