Reproductive systems - Male - Penis

9 important questions on Reproductive systems - Male - Penis

What is the function of a penis?

Convey spermatozoa and urine

What exactly is a penis?

The surrounding of urethra by erectile tissue (corpus spongiosum)

What are the structures of a penis?

Proximally: urethral bulb (of the corpus spongiosum), prepuce
Along the penis: corpus spongiosum, crus, glans
Dorsally, along the penis: corpus cavernosum surrounded by CT sheath
Distally: Glans of penis
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What is the corpus cavernosum?

It is a paired erectile tissue that can change in shape and size when engorged with blood, they form physical anchorage onto the pelvis. It is covered by CT sheaths and tunica albuginea

As you go distally on the penis what can you see in the cross section?

Proximal: 90% corpus cavernosum, 10% urethra and corpus spongiosum
Halfway: 70% corpus cavernosum, 30% urethra and corpus spongiosum
Distal/glans: very little to no corpus cavernosum, mainly urethra and corpus spongiosum

What is the purpose of the corpus cavernosum?

It maintains blood pressure in the penis

Where in the pelvis does the corpus cavernosum attach?

The ischial arch, made up of two ischia.

What covers the crura (plural for crus) in the male pelvis?

Ischiocavernosus muscle covers the crura of corpus cavernosum + CT sheath + tunica albuginea

What covers the bulb of the penis in the male pelvis?

Bulbospongiosus muscle

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