Penis Flashcards
Parts
- Root
- Body
- Glans penis
Root
Lies in perineum and consists of 3 structures:
1. 2 Crura
2. Bulb
Crura
- Posterior ends of the 2 corpora cavernosa of penis body 2. Attached to pubic arches and each covered by ischiocavernosus muscle
Bulb
- Posterior end of corpus spongiosum of penis body
- Attached to perineal membrane
- Covered by bulbospongisosus muscle
- It is pierced by
spongy urethra and bulbo-urethral glands ducts which open in spongy urethra
Body
Free anterior part consisting
of 3 erectile tissue:
1. 2 corpora cavernosa: on dorsal aspect
2. 1 corpus spongiosum: on ventral aspect of corpora cavernosa and contains spongy urethra
Glans penis
- Distal enlarged end of corpus spongiosum
- Covered by thin skin (prepuce) which is removed in circumcision and connected to external urethral meatus by median fold (frenulum)
Ligaments
- Fundiform ligament (sling-like)
- Suspensory ligament of penis
Fundiform ligament
Arises from lines alba inferior part and splits into 2 parts passing on each side of penis
Suspensory ligament of penis
- Fibroelastic structure which spreads out from symphysis pubis anterior surface
- Fuses with deep fascia on penis dorsum and sides
Arterial supply
Branches from internal pudendal artery:
1. 2 deep arteries
2. 2 arteries of bulb
3. Dorsal arteries
2 deep arteries
- Each runs inside corpus cavernosum supplying it
- Each breaks into small tortuous helecine arteries supplying blood during erection
2 arteries of bulb
Each runs inside penis bulb then in corpus spongiosum alongside urethra
Dorsal arteries
- Each runs lateral to deep dorsal veins of penis
- Supplies penis skin and fascia
Venous drainage
- Superficial dorsal vein
- Deep dorsal vein
Superficial dorsal vein
- Runs superficial to penis fascia in median plane of penis dorsum
- It drains into great saphenous vein
Deep dorsal vein
- Runs deep to penis fascia in median plane of penis dorsum
- It drains into prostatic venous plexus through gap between transverse perineal ligament and arcuate pubic ligament
Nerve supply
Right and left dorsal nerves of penis
Right and left dorsal nerves of penis
- Arise from pudendal nerve
- Each run lateral to dorsal artery of penis