Male urethra Flashcards Preview

Anatomy > Male urethra > Flashcards

Flashcards in Male urethra Deck (13):
1

What are the parts of the male urethera?

preprostatic (intramural) part - prostatic part - membranous (intermediate) part - spongy (penile) part

2

What is the length of the preprostatic part of the the male urethra?

0.5-1.5 cm

3

What is the length of the prostatic part of the the male urethra?

3.0-4.0 cm

4

What is the length of the membranous part of the the male urethra?

1.0-1.5 cm

5

What is the length of the spongy part of the the male urethra?

15 cm

6

Describe the location of the intramural part of the male urethra

* extends almost vertically through the neck of the bladder

7

Describe the location of the prostatic part of the male urethra

* descends through anterior prostate - forms gentle, anteriorly concave curve - bounded anteriorly by vertical trough-like part (rhabdosphincter) of external urethral sphincter

8

Describe the location of the intermediate part of the male urethra

* passes through deep perineal pouch - surrounded by circular fibers of extrnal urethral sphincter - penetrates perineal membrane

9

Describe the location of the penile part of the male urethra

* courses through corpus spongiosum - initial widening occurs in bulb of penis - widens again distally as navicular fossa (in glans penis)

10

What are the features of the preprostatic part of the male urethra?

* surrounded by internal urethral sphincter - diameter and length vary (depends on whether bladder is filing or emptying)

11

What are the features of the prostatic part of the male urethra?

* widest and most dilatable part - features urethral crest with seminal colliculus - flanked by prostatic sinuses into which the prostatic ducts open - ejaculatory ducts open onto colliculus (hence urinary and reproductive tracts merge in this part)

12

What are the features of the membranous part of the male urethra?

* narrowest and least distensible part (except for external urethral orifice)

13

What are the features of the spongy part of the male urethra?

* longest and most mobile part - bulbourethral glands open into bulbous part - distally urethral glands open into small urethral lacunae entering lumen of this part